MAX16032ETM+ ,EEPROM-Based System Monitors with Nonvolatile Fault MemoryFeaturesThe MAX16031/MAX16032 EEPROM-configurable sys- ♦ Supply Voltage Operating Range of 2.85V to ..
MAX16036LLB31+ ,Low-Power Battery-Backup Circuits in Small µDFN Packagesfeatures.● Set-Top Boxes ● Intelligent Instrument+Denotes a lead(Pb)-free/RoHS-compliant package.T ..
MAX16036LLB46+ , Low-Power Battery Backup Circuits in Small μDFN Packages
MAX16036PLB26+T ,Low-Power Battery-Backup Circuits in Small µDFN PackagesElectrical Characteristics(V = 2.25V to 5.5V, V = 3V, RESET not asserted, T = -40°C to +85°C, for M ..
MAX1603EAI ,Dual-Channel CardBus and PCMCIA VCC/VPP Power-Switching NetworksApplicationsMAX157ACUA 0°C to +70°C 8 µMAX ±0.5Battery-Powered Systems InstrumentationMAX157BCUA 0° ..
MAX16047ETN+ ,12-/8-Channel EEPROM-Programmable System Managers with Nonvolatile Fault RegistersApplicationswatchdog input or output (WDI/WDO), or as a manualServersreset (MR).WorkstationsThe MAX ..
MAX4292EUA ,Dual, ultra-small, single supply +1.8V to +5.5V or dual supples +-0.9V to +-2.75V, micropower, Rail-to-Rail I/O op amp.ELECTRICAL CHARACTERISTICS(V = +1.8V to +5.5V, V = V = 0, V = V / 2, R = 100kΩ connected to V / 2, ..
MAX4292EUA ,Dual, ultra-small, single supply +1.8V to +5.5V or dual supples +-0.9V to +-2.75V, micropower, Rail-to-Rail I/O op amp.ApplicationsOrdering Information2-Cell Battery-Operated Systems PIN- TOPPART TEMP. RANGEPACKAGE MAR ..
MAX4292EUA-T ,Ultra-Small, +1.8V, µPower, Rail-to-Rail I/O Op AmpsApplications PIN- TOP 2-Cell Battery-Operated Systems PART TEMP RANGE PACKAGE MARKPortable Electron ..
MAX4294ESD ,Quad, ultra-small, single supply +1.8V to +5.5V or dual supples +-0.9V to +-2.75V, micropower, Rail-to-Rail I/O op amp.FeaturesThe MAX4291/MAX4292/MAX4294 family of micropow- Ultra-Low Voltage Operation—Guaranteed Dow ..
MAX4294ESD+T ,Ultra-Small, +1.8V, µPower, Rail-to-Rail I/O Op Ampsapplications.♦ Rail-to-Rail Input Common-Mode RangeThe MAX4291/MAX4292/MAX4294 have an input com-mo ..
MAX4294EUD+ ,Ultra-Small, +1.8V, µPower, Rail-to-Rail I/O Op AmpsELECTRICAL CHARACTERISTICS (continued)(V = 1.8V to 5.5V, V = V = 0, V = V /2, R = 100kΩ connected t ..
MAX16032ETM+
EEPROM-Based System Monitors with Nonvolatile Fault Memory
General DescriptionThe MAX16031/MAX16032 EEPROM-configurable sys-
tem monitors feature an integrated 10-bit analog-to-
digital converter (ADC) designed to monitor voltages,
temperatures, and current in complex systems. These
EEPROM-configurable devices allow enormous flexibility
in selecting operating ranges, upper and lower limits,
fault output configuration, and operating modes with
the capability of storing these values within the device.
The MAX16031 monitors up to eight voltages, three
temperatures (one internal/two external remote temper-
ature diodes), and a single current. The MAX16032
monitors up to six voltages and two temperatures (one
internal/one remote temperature diode). Each of these
monitored parameters is muxed into the ADC and writ-
ten to its respective register that can be read back
through the SMBus™ and JTAG interface.
Measured values are compared to the user-config-
urable upper and lower limits. For voltage measure-
ments, there are two undervoltage and two overvoltage
limits. For current and temperature, there are two sets
of upper limits. Whenever the measured value is out-
side its limits, an alert signal is generated to notify the
processor. Independent outputs are available for over-
current, overtemperature, and undervoltage/overvolt-
age that are configured to assert on assigned
channels. There are also undedicated fault outputs that
are configured to offer a secondary limit for tempera-
ture, current, or voltage fault or provide a separate
overvoltage output.
During a major fault event, such as a system shutdown,
the MAX16031/MAX16032 automatically copy the inter-
nal ADC registers into the nonvolatile EEPROM registers
that then are read back for diagnostic purposes.
The MAX16031/MAX16032 offer additional GPIOs that
are used for voltage sequencing, additional fault out-
puts, a manual reset input, or read/write logic levels. A
separate current-sense amplifier with an independent
output allows for fast shutoff during overcurrent condi-
tions. The MAX16031/MAX16032 are available in a
7mm x 7mm TQFN package and are fully specified
from -40°C to +85°C.
ApplicationsServersWorkstations
Storage SystemsNetworking
Telecom
FeaturesSupply Voltage Operating Range of 2.85V to 14VMonitors Up to Eight Voltages (Single-Ended or
Pseudo-Differential) with 1% AccuracyEEPROM-Configurable Limits
Two Undervoltage and Two Overvoltage
Two Overtemperature
Two OvercurrentHigh-Side Current-Sense Amplifier with
Overcurrent Output (MAX16031 Only)Monitors Up to Three Temperatures
(1 Internal/2 Remote)Nonvolatile Fault Memory Stores Fault Conditions
for Later RetrievalTwo Additional Configurable Fault OutputsTwo Configurable GPIOsSMBus/I2C-Compatible Interface with ALERT
Output and Bus Timeout FunctionJTAG Interface7mm x 7mm, 48-Pin TQFN Package
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault MemoryIN1
N.C.
DXP1
DXN1
N.C. (DXP2)
N.C. (DXN2)
N.C. (CS+)
N.C. (CS-)
N.C.
N.C.
VCC1415EP
+1718192021222324
VCC
GND
GPIO1GPIO2
RBPSDASCLA1
ALERT
OVERT
N.C. (OVERC)
FAULT2
ABP
GND
DBP
TDO
N.C.
N.C.
N.C.
TDI
TCK
TMS
RESET
FAULT1
( ) MAX16031 ONLY
IN2
IN3
IN4
N.C.
N.C.
N.C.
N.C.
GND
IN5
IN6
N.C. (IN7)
N.C. (IN8)
MAX16031
MAX16032
Pin Configuration19-0870; Rev 4; 8/11
EVALUATION KIT
AVAILABLE
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX16031ETM+-40°C to +85°C48 TQFN-EP*
MAX16032ETM+-40°C to +85°C48 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
Typical Application CircuitMAX16031
ALERT
1μF
3.3V AUX
12V BUS
1μF
SCL
SDA
GPIO1
RESET
FAULT1
FAULT2
OVERT
OVERC
GPIO2DXN2
DXP2
ABP
CS+
DXN1
DXP1
VCCINT
SCLμC
SDA
SYSTEM RESET
TO FAN CONTROL
WARNING INDICATORS
MANUAL
RESET
SWITCH
SYSTEM JTAG
HEADER
TO OTHER
JTAG DEVICES
RESET
1μF
DBP
2.2μF
RBPGNDA0A1TDITDOTCKTMS
TMS
TCK
TDI
CS-IN1
1.8V DC-DC
2.5V DC-DC
3.3V DC-DC
5V DC-DC
0.9V
LINEAR
1.2V
DC-DC
1.5V
DC-DC
IN2IN3IN4IN5IN6IN7IN8
1.5V
3.3V
1.2V
2.5V
0.9V
1.8V
Selector Guide
VOLTAGE MONITORSTEMPERATURE SENSORSPARTSINGLE ENDEDDIFFERENTIALINTEXT
CURRENT-
SENSE AMPS
FAULT
OUTPUTSGPIOsMAX16031ETM+8412142
MAX16032ETM+6311—42
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= 2.9V to 14V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at VCC= 3.3V, TA = +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND............................................................-0.3V to +15V
IN_, FAULT_, SCL, SDA, OVERTto GND.................-0.3V to +6V
A0, A1, TCK, TMS, TDI to GND................................-0.3V to +6V
OVERC, RESET, GPIO_, ALERTto GND..................-0.3V to +6V
RBP, ABP, DBP to GND...-0.3V to lower of (6V and VCC+ 0.3V)
TDO, DXP1, DXP2 to GND..........................-0.3V to VDBP+ 0.3V
CS+, CS- to GND...................................................-0.3V to +30V
(CS+ - CS-)............................................................................±5V
DXN1, DXN2 to GND.............................................-0.3V to +0.8V
SDA, ALERTCurrent...........................................-1mA to +50mA
DXN1, DXN2 Current............................................................1mA
Input/Output Current
(all except DXN1, DXN2, SDA, and ALERT)..................20mA
Continuous Power Dissipation (TA= +70°C)
48-Pin, 7mm x 7mm TQFN
(derate 27.8mW/°C above +70°C) ........................2222.2mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+250°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating Voltage RangeVCC2.9014.00V
Undervoltage LockoutVUVLOMinimum voltage at VCC
to access the digital interfaces2.8V
Undervoltage Lockout HysteresisVUVLOHYS100mV
Supply CurrentICCStatic (EEPROM not accessed)35mA
ADC DC ACCURACYResolution10Bits
Total Unadjusted ErrorTA = -40°C to +85°C0.9%FSR
Integral Nonlinearity1LSB
Differential Nonlinearity1LSB
ADC Total Monitoring Cycle TimetCYCLEEight supply inputs, three temperatures,
and current sense80100µs
Register map bit set to 00
(LSB = 5.46mV)5.6
Register map bit set to 01
(LSB = 2.73mV)2.8ADC IN_ Voltage Ranges
Register map bit set to 10
(LSB = 1.36mV)1.4
Reference VoltageVRBP1.3861.41.414V
IN_ ANALOG INPUTAbsolute Input Voltage Range
(Referenced to GND)05.6V
Input Impedance305080kΩ
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSr5Ch[5] = 00.78Input HysteresisPercent of programmed
thresholdr5Ch[5] = 11.17%
RESET OUTPUTr20h[5:3] = 000; from MR going high22.52527.5µs
r20h[5:3] = 0012.252.52.75
r20h[5:3] = 01091011
r20h[5:3] = 011364044
r20h[5:3] = 100144160176
r20h[5:3] = 101576640704
r20h[5:3] = 110115212801408
Reset Timeout PeriodtRP
r20h[5:3] = 111230425602816
TEMPERATURE MEASUREMENTSInternal Sensor Measurement
Error(Note 2)±3°C
External Remote Diode
Temperature Measurement Error(Note 2)±5°C
Temperature Measurement
Resolution0.5°C
Temperature Measurement NoiseInternal sensor0.1°C
External Diode Drive High84µA
External Diode Drive Low6µA
Diode Drive Current Ratio14
DXN_ Impedance to GND1.8kΩ
Power-Supply RejectionPSRInternal sensor, DC condition0.1°C/V
CURRENT SENSECS+ Input Voltage RangeVCS+328V
ICS+VCS+ = VCS-1425Input Bias CurrentICS-VCS- = VCS+38µA
A = 4821.52528.5
A = 24455055
A = 1292100108
Primary Current-Sense
Differential ThresholdsVCSTHVCS+ - VCS-
A = 6190200210
Primary Current-Sense ThresholdCSHYSPercent of VCSTH0.5%
r5Ch[1:0] = 0050µs
r5Ch[1:0] = 013.644.4
r5Ch[1:0] = 1014.41617.6
Secondary Overcurrent
Threshold Timeout
r5Ch[1:0] = 1157.66470.4
ELECTRICAL CHARACTERISTICS (continued)(VCC= 2.9V to 14V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at VCC= 3.3V, TA = +25°C.) (Note 1)
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSA = 6232
A = 12116
A = 2458
Current-Sense Analog Input
RangeVCS+ - VCS-
A = 4829
VSENSE = 150mV (A = 6 only)-4±0.2+4
VSENSE = 50mV (A = 6, 12 only)-10±1.2+10
VSENSE = 25mV±2
ADC Current-Sense
Measurement Accuracy
VSENSE = 10mV±10
Gain AccuracyVSENSE = 20mV to 100mV,
VCS+ = 12V, A = 6-3+3%
Common-Mode Rejection RatioCMRRCSVCS+ > 4V80dB
Power-Supply Rejection RatioPSRRCS80dB
OVERC Output Leakage CurrentIOVERCLKG1µA
OVERC Output Low VoltageVOLOVERCIOUT = 3mA0.4V
OVERC Propagation DelaytOVERCVSENSE - VCSTH > 10% x VCSTH5µs
SMBus INTERFACE (SCL, SDA)Logic-Input Low VoltageVILInput voltage falling0.8V
Logic-Input High VoltageVIHInput voltage rising2.0V
Input Leakage CurrentGND or 5.5V (VCC = 5.5V) VSCL, VSDA-1+1µA
Output Low VoltageVOLISINK = 3mA0.4V
Input CapacitanceCIN5pF
ALERT, FAULT_, AND GPIO_ OUTPUTS
ALERT, FAULT_, and GPIO_
Output Low VoltageISINK = 3mA0.4V
ALERT, FAULT_, and GPIO_
Leakage CurrentV ALERT, V FAULT_, VGPIO_ = 5.5V or GND-1+1µA
GPIO_ (INPUT)Logic-Low VoltageGPIO_ voltage falling0.8V
Logic-High VoltageGPIO_ voltage rising2.0V
SMBus ADDRESS (A0 and A1)Address Logic-Low0.4V
Address Logic-High1.4V
High-Impedance Leakage
Current
Maximum current to achieve high-
impedance logic level-1+1µA
Input Leakage Current0 to 3V, VCC = 3V-12+12µA
ELECTRICAL CHARACTERISTICS (continued)(VCC= 2.9V to 14V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at VCC= 3.3V, TA = +25°C.) (Note 1)
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SMBus TIMING (see Figure 1)Serial-Clock FrequencyfSCL400kHz
Bus Free Time Between STOP
and START ConditionstBUF1.3µs
START Condition Setup TimetSU:STA0.6µs
START Condition Hold TimetHD:STA0.6µs
STOP Condition Setup TimetSU:STO0.6µs
Clock Low PeriodtLOW1.3µs
Clock High PeriodtHIGH0.6µs
Data Setup TimetSU:DAT100ns
Output Fall TimetOFCBUS = 10pF to 400pF250ns
Data Hold TimetHD:DATFrom 50% SCL falling to SDA change0.30.9µs
Minimum Pulse Width Ignored30ns
SMBus TimeouttTIMEOUTSCL time low for reset2535ms
JTAG INTERFACE (see Figure 2)TDI, TMS, TCK Logic-Low Input
VoltageVILInput voltage falling0.4V
TDI, TMS, TCK Logic-High Input
VoltageVIHInput voltage rising2.2V
TDO Logic-Output Low VoltageVOLISINK = 4mA0.4V
TDO Logic-Output High VoltageVOHISOURCE = 1mA2.2V
TDO Leakage CurrentTDO high impedance-10+10µA
TDI, TMS Pullup ResistorsRJPUPullup to VDBP6.51016kΩ
I/O CapacitanceCI/O50pF
TCK Clock Periodt11000ns
TCK High/Low Timet2, t3(Note 3)60500ns
TCK to TMS, TDI Setup Timet415ns
TCK to TMS, TDI Hold Timet535ns
TCK to TDO Delayt6500ns
TCK to TDO High-Impedance
Delayt7500ns
MISCELLANEOUSPower-On DelaytD-PO4ms
Single-Byte EEPROM Write Cycle
Delay(Note 4)11ms
ELECTRICAL CHARACTERISTICS (continued)(VCC= 2.9V to 14V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at VCC= 3.3V, TA = +25°C.) (Note 1)
Note 1:Limits to -40°C are guaranteed by design.
Note 2:Guaranteed by design.
Note 3:TCK stops either high or low.
Note 4:An additional cycle is required when writing to configuration memory for the first time.
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault MemorySTOP
CONDITION
REPEATED START
CONDITION
START
CONDITION
tHIGH
tLOWtF
tSU:DATtSU:STA
tSU:STOtHD:STA
tBUF
tHD:STA
tHD:DAT
SCL
SDA
START
CONDITION
Figure 1. SMBus Interface Timing Diagram
TCKt3t5
TDI, TMS
TDO
TRI-STATE ONLY
Figure 2. JTAG Interface Timing Diagram
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
VCC SUPPLY CURRENT
vs. VCC SUPPLY VOLTAGEMAX16031 toc01
VCC (V)
ICC
(mA)108642
TA = +25°CTA = +85°C
TA = -40°C
NORMALIZED IN_ THRESHOLD
vs. TEMPERATUREMAX16031 toc02
TEMPERATURE (°C)
NORMALIZED IN_ THRESHOLD3510-15
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX16031 toc03
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD3510-15
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
MAX16031 toc04
SINK CURRENT (mA)
OUTPUT VOLTAGE LOW (mV)51234
ADC INTEGRAL NONLINEARITY
vs. INPUT VOLTAGE
MAX16031 toc05
INPUT VOLTAGE (DIGITAL CODE)
ADC INL (LSB)
ADC DIFFERENTIAL NONLINEARITY
vs. INPUT VOLTAGE
MAX16031 toc06
INPUT VOLTAGE (DIGITAL CODE)
ADC DNL (LSB)
Typical Operating Characteristics
(Typical values are at VCC= 3.3V, TA = +25°C, unless otherwise noted.)
NOISE HISTOGRAMMAX16031 toc07
COUNTS (THOUSANDS)
ADC HALF-SCALE
VOLTAGE INPUT
REFERENCE VOLTAGE
vs. TEMPERATUREMAX16031 toc08
REFERENCE VOLTAGE (V)3510-15
-4085
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
INTERNAL TEMPERATURE SENSOR
ACCURACY vs. TEMPERATUREMAX16031 toc09
TEMPERATURE (°C)
TEMP SENSOR ACCURACY (4015-10
TEMPERATURE ERROR
vs. REMOTE DIODE TEMPERATURE
MAX16031 toc10
REMOTE DIODE TEMPERATURE (°C)
TEMPERATURE ERROR (75456001530-15
TEMPERATURE ERROR
vs. LEAKAGE RESISTANCE
LEAKAGE RESISTANCE (MΩ)
TEMPERATURE ERROR (
PATH = DXP TO GND
PATH = DXP TO VCC (+5V)
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCEMAX16031 toc12
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR (
°C)7562341
CURRENT-SENSE ACCURACY
vs. VSENSE
MAX16031 toc13
VSENSE (mV)
CURRENT-SENSE ACCURACY (%)
CURRENT-SENSE PRIMARY THRESHOLD
vs. VSENSE OVERDRIVE
MAX16031 toc14
VSENSE OVERDRIVE (mV)
CURRENT-SENSE PRIMARY THRESHOLD (604020
Typical Operating Characteristics (continued)
(Typical values are at VCC= 3.3V, TA = +25°C, unless otherwise noted.)
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
Pin Description
PIN
MAX16031MAX16032NAMEFUNCTION1IN2
Supply Monitor Input 2. IN2 is internally sampled by the ADC. It is configurable for unipolar/
bipolar and single-ended/pseudo-differential. In pseudo-differential mode, IN1 and IN2 form
the + and - of the differential pair. Each input must stay within the specified ADC IN_ voltage
range.2IN3
Supply Monitor Input 3. IN3 is internally sampled by the ADC. It is configurable for unipolar/
bipolar and single-ended/pseudo-differential. In pseudo-differential mode, IN3 and IN4 form
the + and - of the differential pair. Each input must stay within the specified ADC IN_ voltage
range.3IN4
Supply Monitor Input 4. IN4 is internally sampled by the ADC. It is configurable for unipolar/
bipolar and single-ended/pseudo-differential. In pseudo-differential mode, IN3 and IN4 form
the + and - of the differential pair. Each input must stay within the specified ADC IN_ voltage
range.
4–7, 30, 31,
32, 39, 40,
4–7, 11, 12,
23, 30, 31,
32, 39,
40–44, 47
N.C.No Connection. Leave unconnected. Do not use.
8, 13, 358, 13, 35GNDGround. Connect all GND pins together.9IN5
Supply Monitor Input 5. IN5 is internally sampled by the ADC. It is configurable for unipolar/
bipolar and single-ended/pseudo-differential. In pseudo-differential mode, IN5 and IN6 form
the + and - of the differential pair. Each input must stay within the specified ADC IN_ voltage
range.10IN6
Supply Monitor Input 6. IN6 is internally sampled by the ADC. It is configurable for unipolar/
bipolar and single-ended/pseudo-differential. In pseudo-differential mode, IN5 and IN6 form
the + and - of the differential pair. Each input must stay within the specified ADC IN_ voltage
range.—IN7
Supply Monitor Input 7. IN7 is internally sampled by the ADC. It is configurable for unipolar/
bipolar and single-ended/pseudo-differential. In pseudo-differential mode, IN7 and IN8 form
the + and - of the differential pair. Each input must stay within the specified ADC IN_ voltage
range.—IN8
Supply Monitor Input 8. IN8 is internally sampled by the ADC. It is configurable for unipolar/
bipolar and single-ended/pseudo-differential. In pseudo-differential mode, IN7 and IN8 form
the + and - of the differential pair. Each input must stay within the specified ADC IN_ voltage
range.14GPIO1Configurable General-Purpose Input/Output 115GPIO2Configurable General-Purpose Input/Output 216RBPADC Reference Bypass. RBP is an internally generated 1.4V reference for the ADC. Bypass
RBP to GND with a 2.2µF capacitor. Do not use RBP to power any additional circuitry.17SDASMBus Serial-Data, Open-Drain Input/Output18SCLSMBus Serial-Clock Input19A0SMBus Address Input 0. Connect to DBP, GND, or leave unconnected to select the desired
device address.SMBus Address Input 1. Connect to DBP, GND, or leave unconnected to select the desired
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
Pin Description (continued)
PIN
MAX16031MAX16032NAMEFUNCTION21ALERT
SMBus Alert Open-Drain Output. ALERT follows the SMBALERT# signal functionality
described in Appendix A of the SMBus 2.0 Specification. ALERT asserts when the device
detects a fault, thereby interrupting the host processor to query which device on the serial
bus detected faults.22OVERTOvertemperature, Open-Drain Output. OVERT asserts when an overtemperature condition is
detected.—OVERCOvercurrent, Open-Drain Output. OVERC asserts when the primary overcurrent threshold is
exceeded.24FAULT2Configurable Open-Drain Fault Output 225FAULT1Configurable Open-Drain Fault Output 126RESETConfigurable Open-Drain Reset Output27TMSJTAG Test Mode Select Input. Internally pulled up to VDBP with a 10kΩ resistor.28TCKJTAG Test Clock Input29TDIJTAG Test Data Input. Internally pulled up to VDBP with a 10kΩ resistor.33TDOJTAG Test Data Output34DBPInternal Digital Voltage Regulator Output. Connect a 1µF bypass capacitor from DBP to
GND. Do not use DBP to power external circuitry.36ABPInternal Analog Voltage Regulator Output. Connect a 1µF bypass capacitor from ABP to
GND. Do not use ABP to power external circuitry.
37, 3837, 38VCCDevice Power Supply. Bypass VCC to GND with a 1µF capacitor.—CS-Current-Sense Negative Input. Must be biased between 3V to 28V for proper operation.—CS+Current-Sense Positive Input. Must be biased between 3V to 28V for proper operation.—DXN2Remote Diode 2 Negative Input. If remote sensing is not used, connect DXP2 to DXN2.—DXP2Remote Diode 2 Positive Input. If remote sensing is not used, connect DXP2 to DXN2.45DXN1Remote Diode 1 Negative Input. If remote sensing is not used, connect DXP1 to DXN1.46DXP1Remote Diode 1 Positive Input. If remote sensing is not used, connect DXP1 to DXN1.48IN1
Supply Monitor Input 1. IN1 is internally sampled by the ADC. It is configurable for unipolar/
bipolar and single-ended/pseudo-differential. In pseudo-differential mode, IN1 and IN2 form
the + and - of the differential pair. Each input must stay within the specified ADC IN_ voltage
range.EPExposed Pad. Connect EP to ground. EP is internally connected to GND. Do not use as the
main ground connection.
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
Functional DiagramMAX16031/
MAX16032
INPUT RANGE
SELECTION
INPUT RANGE
SELECTION
INPUT RANGE
SELECTION
MULTIPLEXER
INPUT RANGE
SELECTION
INPUT RANGE
SELECTION
INPUT RANGE
SELECTION
INPUT RANGE
SELECTION
INPUT RANGE
SELECTION
EXTERNAL
TEMPERATURE
SENSOR
CIRCUITRY
INTERNAL
TEMPERATURE SENSOR
CIRCUITRY
CURRENT-SENSE
AMPLIFIER/
COMPARATOR
EEPROMSMBus
SERIAL
INTERFACE
FAULT
COMPARATORS
1.4V INTERNAL
REFERENCE
DIGITAL
REGULATOR
ANALOG
REGULATOR
VCC
JTAG
SERIAL
INTERFACE
REGISTERS
OSCILLATOR
10-BIT
ADC
ABP
DBP
RBP
FAULT1
FAULT2
OVERT
RESET
GPIO1
GPIO2
SDA
SCL
ALERT
TMS
TCK
TDI
TDO
OVERC
IN1
IN2
IN3
IN4
IN5
IN6
*IN7
*IN8
DXP1
DXN1
*DXP2
*DXN2
*MAX16031 ONLY
*CS+
*CS-
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
Table 1. Address Map
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
READ/
WRITEDESCRIPTION00h—RIN1 ADC Result Register (MSB)
01h—RIN1 ADC Result Register (LSB)
02h—RIN2 ADC Result Register (MSB)
03h—RIN2 ADC Result Register (LSB)
04h—RIN3 ADC Result Register (MSB)
05h—RIN3 ADC Result Register (LSB)
06h—RIN4 ADC Result Register (MSB)
07h—RIN4 ADC Result Register (LSB)
08h—RIN5 ADC Result Register (MSB)
09h—RIN5 ADC Result Register (LSB)
0Ah—RIN6 ADC Result Register (MSB)
0Bh—RIN6 ADC Result Register (LSB)
0Ch—RIN7 ADC Result Register (MSB)*
0Dh—RIN7 ADC Result Register (LSB)*
0Eh—RIN8 ADC Result Register (MSB)*
0Fh—RIN8 ADC Result Register (LSB)*
10h—RInternal Temperature Sensor ADC Result Register (MSB)
11h—RInternal Temperature Sensor ADC Result Register (LSB)
12h—RRemote Temperature Sensor 1 ADC Result Register (MSB)
13h—RRemote Temperature Sensor 1 ADC Result Register (LSB)
14h—RRemote Temperature Sensor 2 ADC Result Register (MSB)
15h—RRemote Temperature Sensor 2 ADC Result Register (LSB)
16h—RCurrent-Sense ADC Result Register
17h97hR/WVoltage Monitoring Input ADC Range Selection (IN1–IN4)
18h98hR/WVoltage Monitoring Input ADC Range Selection (IN5–IN8)
19h99hR/WCurrent-Sense Gain/Primary Threshold and Remote Temperature Sensor 1 Gain Trim
1Ah9AhR/WVoltage Monitoring Input Enable
1Bh9BhR/WInternal/Remote Temperature Sensor, Current Sense, and ALERT Enables and
Remote Temperature Sensor 1 Offset Trim
1Ch9ChR/WVoltage Monitoring Input Single-Ended/Differential and Unipolar/Bipolar Selection
1Dh9DhR/WFAULT1 Dependency Selection
1Eh9EhR/WFAULT2 Dependency Selection
1Fh9FhR/WOVERT Dependency Selection
20hA0hR/WRESET Dependency and Timeout Selection
21hA1hR/WRESET IN1–IN8 Dependency Selection
22hA2hR/WGPIO1 Configuration
23hA3hR/WGPIO1 Dependency Selection
24hA4hR/WGPIO2 Configuration
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
READ/
WRITEDESCRIPTION25hA5hR/WGPIO2 Dependency Selection
26hA6hR/WIN1 Primary Undervoltage Threshold
27hA7hR/WIN1 Primary Overvoltage Threshold
28hA8hR/WIN1 Secondary Undervoltage Threshold
29hA9hR/WIN1 Secondary Overvoltage Threshold
2AhAAhR/WIN2 Primary Undervoltage Threshold
2BhABhR/WIN2 Primary Overvoltage Threshold
2ChAChR/WIN2 Secondary Undervoltage Threshold
2DhADhR/WIN2 Secondary Overvoltage Threshold
2EhAEhR/WIN3 Primary Undervoltage Threshold
2FhAFhR/WIN3 Primary Overvoltage Threshold
30hB0hR/WIN3 Secondary Undervoltage Threshold
31hB1hR/WIN3 Secondary Overvoltage Threshold
32hB2hR/WIN4 Primary Undervoltage Threshold
33hB3hR/WIN4 Primary Overvoltage Threshold
34hB4hR/WIN4 Secondary Undervoltage Threshold
35hB5hR/WIN4 Secondary Overvoltage Threshold
36hB6hR/WIN5 Primary Undervoltage Threshold
37hB7hR/WIN5 Primary Overvoltage Threshold
38hB8hR/WIN5 Secondary Undervoltage Threshold
39hB9hR/WIN5 Secondary Overvoltage Threshold
3AhBAhR/WIN6 Primary Undervoltage Threshold
3BhBBhR/WIN6 Primary Overvoltage Threshold
3ChBChR/WIN6 Secondary Undervoltage Threshold
3DhBDhR/WIN6 Secondary Overvoltage Threshold
3EhBEhR/WIN7 Primary Undervoltage Threshold*
3FhBFhR/WIN7 Primary Overvoltage Threshold*
40hC0hR/WIN7 Secondary Undervoltage Threshold*
41hC1hR/WIN7 Secondary Overvoltage Threshold*
42hC2hR/WIN8 Primary Undervoltage Threshold*
43hC3hR/WIN8 Primary Overvoltage Threshold*
44hC4hR/WIN8 Secondary Undervoltage Threshold*
45hC5hR/WIN8 Secondary Overvoltage Threshold*
46hC6hR/WInternal Temperature Sensor Primary Overtemperature Threshold (MSB)
47hC7hR/WInternal Temperature Sensor Secondary Overtemperature Threshold (MSB)
48hC8hR/WRemote Temperature Sensor 1 Primary Overtemperature Threshold
49hC9hR/WRemote Temperature Sensor 1 Secondary Overtemperature Threshold
4AhCAhR/WRemote Temperature Sensor 2 Primary Overtemperature Threshold
Table 1. Address Map (continued)
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
READ/
WRITEDESCRIPTION4BhCBhR/WRemote Temperature Sensor 2 Secondary Overtemperature Threshold
4ChCChR/WOvercurrent Secondary Threshold
4DhCDhR/WRemote Temperature Sensor Primary/Secondary Overtemperature Threshold (LSBs).
External Temperature Sensor 2 Offset Trim
4EhCEhR/WRem ote Tem p er atur e S ensor 1/2 P r i m ar y/S econd ar y O ver tem p er atur e Thr eshol d ( LS Bs)
4FhCFhR/WRemote Temperature Sensor 2 Gain Trim
50hD0hR/WRemote Temperature Sensor Short/Open Status
51hD1hR/WIN1–IN8 Primary Threshold Fault Status
52hD2hR/WIN1–IN8 Secondary Threshold Fault Status
53hD3hR/WTemperature/Current Threshold Fault Status
54hD4hR/WRemote Temperature Sensor Short/Open Fault Mask
55hD5hR/WIN1–IN8 Primary Threshold Fault Mask
56hD6hR/WIN1–IN8 Secondary Threshold Fault Mask
57hD7hR/WTemperature/Current Threshold Fault Mask
58hD8hR/WIN1–IN8 Primary Undervoltage Faults Triggering Fault EEPROM
59hD9hR/WIN1–IN8 Primary Overvoltage Faults Triggering Fault EEPROM
5AhDAhR/WTemperature/Current Faults Triggering Fault EEPROM
5BhDBhR/WTemperature Filter Selection and Postboot Fault Mask Time
5ChDChR/WThreshold Fault Options and Overcurrent Fault Timeout
5DhDDh—Reserved
5EhDEhR/WCustomer Firmware Version
5FhDFhR/WEEPROM and Configuration Lock
60h–7FhE0h–FFh—Reserved80hRIN1–IN8 Primary Threshold Fault Status at Time of Fault81hRIN1–IN8 Secondary Threshold Fault Status at Time of Fault82hRTemperature/Current Threshold Fault Status at Time of Fault83hRIN1 Conversion Result at Time of Fault84hRIN2 Conversion Result at Time of Fault85hRIN3 Conversion Result at Time of Fault86hRIN4 Conversion Result at Time of Fault87hRIN5 Conversion Result at Time of Fault88hRIN6 Conversion Result at Time of Fault89hRIN7 Conversion Result at Time of Fault*8AhRIN8 Conversion Result at Time of Fault*8BhRInternal Temperature Sensor Conversion Result at Time of Fault8ChRRemote Temperature Sensor 1 Conversion Result at Time of Fault8DhRRemote Temperature Sensor 2 Conversion Result at Time of Fault*8EhRCurrent-Sense Conversion Result at Time of Fault*
Table 1. Address Map (continued)
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
Detailed Description
Getting StartedThe MAX16031/MAX16032 contain both I2C/SMBus and
JTAG serial interfaces for accessing registers and
EEPROM. Use only one interface at any given time. For
more information on how to access the internal memory
through these interfaces, see the I2C/SMBus-Compatible
Serial Interfaceand JTAG Serial Interfacesections. This
data sheet uses a specific convention for referring to bits
within a particular address location. As an example,
r15h[3:0] refers to bits 3 through 0 in register with
address 15 hexadecimal.
The factory-default values at power-on reset (POR) for all
EEPROM locations are zeros. POR occurs when VCC
reaches the undervoltage lockout (UVLO) of 2.8V. At
POR, the device begins a boot-up sequence. During the
boot-up sequence, all monitored inputs are masked from
initiating faults and EEPROM contents are copied to the
respective register locations. The boot-up sequence
takes up to 1.81ms. Monitoring is disabled for up to 16s
past the boot-up sequence by programming r5Bh[3:0]
(see the Miscellaneous Settingssection). RESETis low
during boot-up and remains low after boot-up for its pro-
grammed timeout period after all monitored channels are
within their respective thresholds.
The MAX16031/MAX16032 monitor up to eight voltages,
up to one current, and up to three temperatures. After
boot-up, an internal multiplexer cycles through each
input. At each multiplexer stop, the 10-bit ADC converts
the analog parameter to a digital result and stores the
result in a register. Each time the multiplexer completes a
cycle, internal logic compares the conversion results to
the thresholds stored in memory. When a conversion vio-
lates a programmed threshold, the conversion is config-
ured to generate a fault. Logic outputs are programmed
to depend on many combinations of faults. Additionally,
faults are programmed to trigger a fault log, whereby all
fault information is automatically written to EEPROM.
Voltage MonitoringThe MAX16031 provides eight inputs, IN1–IN8, for volt-
age monitoring. The MAX16032 provides six inputs,
IN1–IN6, for voltage monitoring. Each input voltage
range is programmable through r17h[7:0] and r18h[7:0]
(see Table 2). Voltage monitoring for each input is
enabled through r1Ah[7:0] (see Table 2). There are four
programmable thresholds per voltage monitor input: pri-
mary undervoltage, secondary undervoltage, primary
overvoltage, and secondary overvoltage. All voltage
thresholds are 8 bits wide. Only the 8 most significant
bits of the conversion result are compared to the
thresholds. See the Miscellaneous Settingssection to
set the amount of hysteresis for the thresholds. See
Table 1 for an address map of all voltage monitor input
threshold registers.
ADC inputs are configurable for two different modes:
pseudo-differential and single-ended (see Table 3). In
pseudo-differential mode, two inputs make up a differ-
ential pair. Psuedo-differential conversions are per-
formed by taking a single-ended conversion at each
input of a differential pair and then subtracting the
results. The pseudo-differential mode is selectable for
unipolar or bipolar operation. Unipolar differential oper-
ation allows only positive polarities of differential volt-
ages. Bipolar differential operation allows negative and
positive polarities of differential voltages. Bipolar con-
versions are in two’s complement format. For example,
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
BIT RANGEDESCRIPTION[1:0]
IN1 Voltage Range Selection:00 = 5.6V, 01 = 2.8V
10 = 1.4V, 11 = Reserved
[3:2]
IN2 Voltage Range Selection:00 = 5.6V, 01 = 2.8V
10 = 1.4V, 11 = Reserved
[5:4]
IN3 Voltage Range Selection:00 = 5.6V, 01 = 2.8V
10 = 1.4V, 11 = Reserved
17h97h
[7:6]
IN4 Voltage Range Selection:00 = 5.6V, 01 = 2.8V
Table 2. Input Monitor Ranges and Enables
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
BIT RANGEDESCRIPTION[1:0]
IN5 Voltage Range Selection:00 = 5.6V, 01 = 2.8V
10 = 1.4V, 11 = Reserved
[3:2]
IN6 Voltage Range Selection:00 = 5.6V, 01 = 2.8V
10 = 1.4V, 11 = Reserved
[5:4]
IN7 Voltage Range Selection:00 = 5.6V, 01 = 2.8V
10 = 1.4V, 11 = Reserved
18h98h
[7:6]
IN8 Voltage Range Selection:00 = 5.6V, 01 = 2.8V
10 = 1.4V, 11 = Reserved
[0]
IN1 Monitoring Enable:0 = IN1 monitoring disabled
1 = IN1 monitoring enabled
[1]
IN2 Monitoring Enable:0 = IN2 monitoring disabled
1 = IN2 monitoring enabled
[2]
IN3 Monitoring Enable:0 = IN3 monitoring disabled
1 = IN3 monitoring enabled
[3]
IN4 Monitoring Enable:0 = IN4 monitoring disabled
1 = IN4 monitoring enabled
[4]
IN5 Monitoring Enable:0 = IN5 monitoring disabled
1 = IN5 monitoring enabled
[5]
IN6 Monitoring Enable:0 = IN6 monitoring disabled
1 = IN6 monitoring enabled
[6]
IN7 Monitoring Enable:0 = IN7 monitoring disabled
1 = IN7 monitoring enabled
1Ah9Ah
[7]
IN8 Monitoring Enable:0 = IN8 monitoring disabled
1 = IN8 monitoring enabled
Table 2. Input Monitor Ranges and Enables (continued)
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
BIT RANGEDESCRIPTION[0]
IN1/IN2 Single-Ended/Pseudo-Differential:0 = IN1 and IN2 conversions are single-ended.
1 = IN1 and IN2 conversions are pseudo-differential (IN1 to IN2).
[1]
IN3/IN4 Single-Ended/Pseudo-Differential:0 = IN3 and IN4 conversions are single-ended.
1 = IN3 and IN4 conversions are pseudo-differential (IN3 to IN4).
[2]
IN5/IN6 Single-Ended/Pseudo-Differential:0 = IN5 and IN6 conversions are single-ended.
1 = IN5 and IN6 conversions are pseudo-differential (IN5 to IN6).
[3]
IN7/IN8 Single-Ended/Pseudo-Differential:0 = IN7 and IN8 conversions are single-ended.
1 = IN7 and IN8 conversions are pseudo-differential (IN7 to IN8).
[4]
IN1/IN2 Unipolar/Bipolar:0 = IN1 and IN2 conversions are unipolar.
1 = IN1 and IN2 conversions are bipolar (two’s complement).
[5]
IN3/IN4 Unipolar/Bipolar:0 = IN3 and IN4 conversions are unipolar.
1 = IN3 and IN4 conversions are bipolar (two’s complement).
[6]
IN5/IN6 Unipolar/Bipolar:0 = IN5 and IN6 conversions are unipolar.
1 = IN5 and IN6 conversions are bipolar (two’s complement).
1Ch9Ch
[7]
IN7/IN8 Unipolar/Bipolar:0 = IN7 and IN8 conversions are unipolar.
1 = IN7 and IN8 conversions are bipolar (two’s complement).
Table 3. IN1–IN8 ADC Input Mode Selectiona -1V differential input (range of 5.6V) gives a decimal
code of -183, which is 1101001001 in two’s comple-
ment binary form. In single-ended mode, conversions
are performed between a single input and ground.
When single-ended mode is selected, conversions are
always unipolar regardless of r1Ch[7:4]. The single-
ended and pseudo-differential ADC mode equations
are shown below.
Unipolar single-ended mode:
where XADCis the resulting code in decimal, VIN-is the
voltage at a voltage monitoring input, and VRANGEis
the selected range programmed in r17h and r18h.
Bipolar/unipolar pseudo-differential mode:
where XADCis the resulting code in decimal, VIN+is the
voltage at a positive input of a differential voltage moni-
toring input pair, VIN-is the voltage at a negative input of
a differential voltage monitoring input pair, and VRANGE
is the selected ADC IN_ voltage range programmed in
r17h and r18h. INTVINTVADCIN
RANGE
RANGE=×⎛⎜⎞⎟−×⎛⎜⎞−10241024 INTVADCIN
RANGE=×⎛⎜⎞⎟−1024
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
Current MonitoringThe MAX16031 provides current-sense inputs CS+/CS-
and a current-sense amplifier for current monitoring
(see Figure 3). There are two programmable current-
sense thresholds: primary overcurrent and secondary
overcurrent. For fast fault detection, the primary over-
current threshold is implemented with an analog com-
parator connected to the OVERCoutput. The primary
threshold equation is:
where ITHis the current threshold to be set, VCSTHis
the threshold set by r19h[1:0], and RSENSEis the value
of the sense resistor. See Table 4 for a description of
r19h. The ADC output for a current-sense conversion is:
where XADCis the 8-bit decimal ADC result, VSENSE
VCS+- VCS-, AVis the current-sense voltage gain set
by r19h[1:0], and VRBPis the reference voltage at RBP
(1.4V typical).
OVERCis latched when the primary overcurrent thresh-
old is exceeded by programming r5Ch[2]. The latch is
cleared by writing a ‘1’ to r53h[6]. OVERCdepends
only on the primary overcurrent threshold. Other fault
outputs are programmed to depend on the secondary
overcurrent threshold. The secondary overcurrent
threshold is implemented through ADC conversions
and digital comparisons. The secondary overcurrent
threshold contains programmable time delay options
located in r5Ch[1:0]. Primary and secondary current-
sense faults are enabled/disabled through r1Bh[3].
Temperature MonitoringThe MAX16031 provides two sets of remote diode inputs,
DXP1/DXN1 and DXP2/DXN2, and one internal tempera-
ture sensor. The MAX16032 provides one set,
DXP1/DXN1, and one internal temperature sensor.
Calibration registers provide adjustments for gain and off-
set to accommodate different types of remote diodes.
The internal temperature sensor circuitry is factory
trimmed. In addition to offset/gain trimming, a program-
mable lowpass filter is provided. See Figure 4 for the
block diagram of the temperature sensor circuitry. The
remote diode is actually a diode-connected transistor.
See Application Notes AN1057 and AN1944 for informa-
tion on error budget and several transistor manufacturers.VAADCSENSEV
RBP=××()− 218VTHCSTH
SENSE=
*AV
CS+
CS-
*VCSTH
*ADJUSTABLE BY r19h [1:0]
RSENSE
TO ADC MUX
VMON
LOAD
OVERC
MAX16031
Figure 3. Current-Sense Block Diagram
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
BIT RANGEDESCRIPTION[1:0]
Overcurrent Primary Threshold and Current-Sense Gain Setting:
00 = 200mV threshold, AV = 6V/V
01 = 100mV threshold, AV = 12V/V
10 = 50mV threshold, AV = 24V/V
11 = 25mV threshold, AV = 48V/V
19h99h
[7:2]Remote Temperature Sensor 1 Gain Trim. Note bit 6 is inverted.
[5:0]Remote Temperature Sensor 1 Gain Trim
Table 4. Overcurrent Primary Threshold and Remote Temperature Sense Gain Trim
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault MemoryThe ADC converts the internal sensor and remote sen-
sor amplifier outputs. Each time the ADC converts all
enabled parameters, the temperature conversions are
compared to the temperature threshold registers (r46h
to r4Bh and r4Dh). Unlike the voltage input compara-
tors, the temperature threshold comparators are 10 bits
wide. OVERTis the designated output for temperature
faults, although other outputs are programmed to
depend on temperature faults as well. See the
Programmable Inputs/Outputssection for more informa-
tion on programming output dependencies. See the
Faultssection for more information on setting tempera-
ture fault thresholds.
The remote temperature sensor amplifier detects a
short or open between DXP_ and DXN_. The detection
of these events is programmed to cause a fault.
Temperature thresholds and conversions are in a two’s
complement temperature format, where 1 LSB corre-
sponds to 0.5°C. The data format for temperature con-
versions is illustrated in Table 5.
Offset and gain errors for remote temperature sensor
measurements are user-trimmed through gain registers
r19h[7:2]/r4Fh[5:0] and offset registers r1Bh[7:5]/r4Dh[6:4],
as shown in Tables 4 and 6. The gain value trims the
high (56µA) drive current source to compensate for the
n-factor of the remote diode. The offset value is multi-
plied by 4 and added to the conversion result numeri-
cally. The MAX16031/MAX16032 contain an internal
lowpass filter at DXN_ and DXP_ to reduce noise. See
the Miscellaneous Settingssection for more information
on programming the filter cutoff frequency.
Reading ADC ResultsADC conversion results are read from the ADC conver-
sion registers through the I2C/SMBus-compatible or
JTAG interfaces (see Table 7). These registers are also
used for fault threshold comparison. Voltage monitoring
thresholds are compared with only the first 8 MSBs of
the conversion results.
Programmable Inputs/OutputsThe MAX16031 provides two general fault outputs,
FAULT1and FAULT2, one reset output RESET, one
temperature fault output OVERT, one current fault out-
put OVERC, two general-purpose inputs/outputs GPIO1
and GPIO2, and one SMBALERT#-compatible output
ALERT. The MAX16032 provides the same except
OVERC. All outputs are open drain and require pullup
resistors. Fault outputs do not latch except for OVERC,
which either latches or does not latch depending on the
configuration bit in r5Ch. Individual fault flag bits, how-
ever, latch (see the Faultssection) and must be cleared
one bit at a time by writing a byte containing all zeros
except for a single ‘1’ in the bit to be cleared.
The general outputs, FAULT1and FAULT2, are identi-
cal in functionality and are programmed to depend on
overvoltage, undervoltage, overtemperature, and over-
current parameters. See r1Dh and r1Eh in Table 8 for
more detailed information regarding the general fault
output dependencies.
The reset output RESETprovides many programmable
output dependencies as well as reset timeouts. See
r20h and r21h in Table 8 for detailed information on
RESEToutput dependencies and timeouts.
The temperature fault output OVERTindicates tempera-
ture-related faults. OVERTis programmed to depend
on any primary temperature threshold and/or theTO ADC MUX
VBIAS ~ 100mV
IBIAS
DXP_
DXN_
ABP
ABP
IHIGHILOW
Figure 4. Remote Temperature Sensor Amplifier Circuitry
TEMPERATURE (°C)DIGITAL CODE+1281100000000
+1251011111010
+1001011010000
+25.510001100111000000000
Diode fault0000000000
Table 5. Temperature Data Format
MAX16031/MAX16032
EEPROM-Based System Monitors
with Nonvolatile Fault Memorying diode open/short fault conditions, and the corre-
sponding diode open/short flags must be cleared to
release the latch. See r1Fh in Table 8 for more informa-
tion on OVERToutput dependencies.
The current fault output OVERCindicates overcurrent
events. OVERConly depends on the primary analog
overcurrent threshold. See the Current Monitoringsec-
tion for more information about the current-sense amplifi-
er and the primary threshold. The secondary overcurrent
threshold is set digitally and is used by other outputs.
The secondary threshold also has a programmable time-
out option (see Miscellaneous Settingssection).
outputs. See r22h–r25h in Table 8 for more detailed
information on GPIO1/GPIO2 functionality. GPIO1 and
GPIO2 assert low when configured as a fault output.
ALERTis an SMBALERT#-compatible fault interrupt
output. When enabled, it is logically ANDed with out-
puts RESET, FAULT1, FAULT2, OVERT, OVERC, and
GPIO1/GPIO2 (only if enabled as fault outputs). When
any fault output is asserted, ALERTalso asserts, inter-
rupting the SMBus master to query the fault. The mas-
ter needs to answer MAX16031/MAX16032 with a
specific SMBus command (ARA) to retrieve the slave
address of the interrupting device. See the I2C/SMBus-
Compatible Serial Interfacesection for more details.
REGISTER
ADDRESS
EEPROM
MEMORY
ADDRESS
BIT RANGEDESCRIPTION[0]
Internal Temperature Sensor Faults Enable:0 = Internal temperature sensor faults disabled
1 = Internal temperature sensor faults enabled
[1]
Remote Temperature Sensor 1 Faults Enable:0 = Remote temperature sensor 1 faults disabled
1 = Remote temperature sensor 1 faults enabled
[2]
Remote Temperature Sensor 2 Faults Enable:0 = Remote temperature sensor 2 faults disabled
1 = Remote temperature sensor 2 faults enabled
[3]
Current-Sense Fault Enable:0 = Current-sense faults disabled
1 = Current-sense faults enabled
[4]
SMBALERT# Enable (ALERT):0 = SMBALERT# disabled
1 = SMBALERT# enabled
1Bh9Bh
[7:5]
Remote Temperature Sensor 1 Offset Trim:Offset = 4 × X, where X is the two’s-complement 3-bit temperature code
(1 LSB = 0.5°C). Since X is multiplied by 4, the offset LSB size is 2°C,
allowing a total offset adjustment of ±6°C.
[1:0]Internal Temperature Sensor Primary Overtemperature Threshold LSB
[3:2]Inter nal Tem p er atur e S ensor S econd ar y O ver tem p er atur e Thr eshol d LS B
[6:4]
Remote Temperature Sensor 2 Offset Trim:Offset = 4 × X, where X is the two’s-complement 3-bit temperature code
(1 LSB = 0.5°C). Since X is multiplied by 4, the offset LSB size is 2°C,
allowing a total offset adjustment of ±6°C.
4DhCDh
[7]Not used.
Table 6. Temperature Sensor Fault Enable, Current-Sense Fault Enable, SMBALERT#
Enable, and Temperature Offset Trim
