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MAX6652AUB+-MAX6652AUB+T
Temperature Sensor and System Monitor in a 10-Pin µMAX
General DescriptionThe MAX6652 system supervisor monitors multiple
power-supply voltages, including its own, and also fea-
tures an on-board temperature sensor. Voltages and
temperature are converted to an 8-bit code using an
analog-to-digital converter (ADC). A multiplexer automat-
ically sequences through the voltage and temperature
measurements. The digitized signals are then stored in
registers and compared to the over/under threshold lim-
its programmed over the 2-wire serial interface.
When a temperature measurement exceeds the pro-
grammed threshold, or when an input voltage falls out-
side the programmed voltage limits, the MAX6652
generates a latched interrupt output ALERT. Three inter-
rupt modes are available for temperature excursions:
default mode, one-time interrupt mode, and comparator
mode. The ALERToutput is cleared, except for tempera-
ture interrupts generated in comparator mode, by read-
ing the interrupt status register (Table 5). The ALERT
output can also be masked by writing to the appropriate
bits in the interrupt mask register (Table 6) or by setting
bit 1 of the configuration register (Table 4) to 0. The
MAX6652 I2C™-compatible/SMBus interface also
responds to the SMB alert response address.
The 2-wire serial interface accepts both I2C and standard
system management bus (SMBus) write byte, read byte,
send byte, and receive byte commands to program the
alarm thresholds and to read voltage and temperature
data. Voltage data is scaled so that when the nominal
voltage is present at a pin (e.g., 3.3V for the 3.3VINpin),
the conversion result is equal to 3/4 of the ADC full-scale
range or a decimal count of 192 (Table 3). The tempera-
ture data format is 7 bits plus sign, with each data bit
representing 1°C, in two's complement format (Table 2).
The MAX6652 has only one address pin, ADD. One of
four different address codes can be selected by con-
necting the ADD pin to GND, VCC, SDA, or SCL.
Whenever an I2C-compatible/SMBus transaction is initiat-
ed, the two LSBs of the slave address register are deter-
mined by connection, setting the chip address to one of
four possible values. In addition, an address code can
also be directly written to the serial address register. This
code will overwrite the code set by connection of the
ADD pin, until the MAX6652 is taken through a power-on
reset cycle.
The MAX6652 features 60Hz or 50Hz line-frequency
rejection for optimal performance. The device operates
from +2.7V to +5.5V and is specified for operation from
-40°C to +125°C. It is available in a tiny 10-pin µMAX
package.
FeaturesMonitors Four Voltages (2.5V, 3.3V, 12V, VCC)Monitors Local TemperatureTemperature Measurement Accuracy,
±2°C (TA= +25°C)User-Programmable Voltage and Temperature
ThresholdsAlert Function with Ability to Respond to SMB
Alert Response Address+2.7V to +5.5V Supply Range-40°C to +125°C Temperature Range60Hz or 50Hz Line-Frequency RejectionTiny 10-Pin µMAX Package
Applications
MAX6652emperature Sensor and System Monitor
in a 10-Pin µMAXVCC
SCL
SDA
ADDN.C.
3.3VIN
2.5VIN
12VIN
MAX6652
μMAX
TOP VIEW
GNDALERT
Pin Configuration19-1959; Rev 1; 8/01
Ordering Information
PARTTEMP. RANGEPIN-PACKAGEMAX6652AUB -40°C to +125°C10 µMAX2C is a trademark of Philips Corp.
Workstations
Servers
Networking
Telecommunications
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
MAX6652emperature Sensor and System Monitor
in a 10-Pin µMAX
ELECTRICAL CHARACTERISTICS(TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +5V, TA= +25°C.)
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.
VCC........................................................................-0.3V to +6.0V
Voltage on 12VIN...................................................-0.3V to +16V
All Other Pins ........................................................-0.3V to +6.0V
Output Current (SDA, ALERT) ............................-1mA to +50mA
Junction Temperature .....................................................+150°C
Operating Temperature Range ........................-40°C to +125°C
Storage Temperature Range ............................-65°C to +150°C
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX(derate 5.6mW/°C above +70°C) ..........444mW
Lead Temperature (soldering, 10s) ................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SUPPLYSupply VoltageVCC2.75.5V
ICCActive200500µA
Supply CurrentISDShutdown mode, all digital inputs are
grounded<110µA
Power-On Reset VoltageVCC_ rising or falling edge2V
TEMPERATURETA = +25°C±2
-20°C ≤ TA ≤ +80°C±3°CAccuracy (Note 5)VCC = +5V
-40°C ≤ TA ≤ +125°C±5
PSRRVCC = +2.7V to +5.5V0.71.3°C/V
Resolution±1°C
ADC CHARACTERISTICSTotal Unadjusted ErrorTUEVIN > 10LSB±1±1.5%
Differential NonlinearityDNLVIN > 10LSB±1LSB
Supply SensitivityPSSVCC = +2.7V to +5.5V±1V
Input ResistanceRIN12VIN, 2.5VIN, 3.3VIN100150200kΩ
Total Monitoring Cycle Timetc(Note 1)200300ms
SCL, SDA, ADDLogic Input Low VoltageVIL0.8V
VCC ≤ 3.6V2.0VLogic Input High VoltageVIHVCC > 3.6V2.6V
SDA Output Low VoltageVOLISINK = 3mA400mV
Input Leakage CurrentILEAKVIN = 0 or 5V±1µA
ALERT
ISINK = 1.2mA, VCC > 2.7V0.3VOutput Low VoltageVOLAISINK = 3.2mA, VCC > 4.5V0.4V
TIMINGSerial Clock FrequencyfSCL0400kHz
Bus Free Time Between STOP and
STARTtBUF1.3µs
ABSOLUTE MAXIMUM RATINGSAll Voltages Are Referenced to GND
MAX6652emperature Sensor and System Monitor
in a 10-Pin µMAX
Note 1:Total monitoring time includes temperature conversion and four analog input voltage conversions.
Note 2:A master device must provide at least a 300ns hold time for the SDA signal, referred to VILof the SCL signal, to bridge the
undefined region of SCL’s falling edge.
Note 3:CB= total capacitance of one bus line in pF. Rise and fall times are measured between 0.3 x VCCto 0.7 x VCC.
Note 4:Input filters on SDA, SCL, and ADD suppress noise spikes <50ns.
Note 5:Guaranteed but not tested over the entire temperature range.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSTART Condition Hold TimetHD:STA0.6µs
STOP Condition Hold TimetSU:STO0.6µs
Clock Low PeriodtLOW1.3µs
Clock High PeriodtHIGH0.6µs
Data Setup TimetSP:DAT100ns
Data Hold TimetHD:DAT(Note 2)00.9µs
Receive SCL/SDA Minimum
Rise TimetR(Note 3)20 +
0.1CBns
Receive SCL/SDA Maximum
Rise TimetR(Note 3)300ns
Receive SCL/SDA Minimum
Fall TimetF(Note 3)20 +
0.1CBns
Receive SCL/SDA Maximum
Fall TimetF(Note 3)300ns
Transmit SDA Fall TimetF400pF, ISINK = 3mA20 +
0.1CB300ns
Pulse Width of Spike
SuppressedtSP(Note 4)50ns
ELECTRICAL CHARACTERISTICS (continued)(TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC = +5V, TA= +25°C.)
Typical Operating Characteristics(VCC= +5V, ADD = GND, ALERT= 10kΩto VCC, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6652 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
A: TA = +125°C
B: TA = +85°C
C: TA = +25°C
D: TA = 0°C
E: TA = -40°C
SUPPLY CURRENT
vs. SCL CLOCK FREQUENCY
MAX6652 toc02
CLOCK FREQUENCY (kHz)
SUPPLY CURRENT (
VCC = +5V
SCL = 0 to +5V
TEMPERATURE ERROR
vs. SUPPLY VOLTAGE
MAX6652 toc03
SUPPLY VOLTAGE (V)
TEMPERATURE ERROR (
TA = +85°C
TA = 0°C
TA = -40°C
MAX6652emperature Sensor and System Monitor
in a 10-Pin µMAXypical Operating Characteristics (continued)(VCC= +5V, ADD = GND, ALERT= 10kΩto VCC, TA= +25°C, unless otherwise noted.)10k
TEMPERATURE ERROR
vs. SUPPLY NOISE FREQUENCY
MAX6652 toc04
SUPPLY NOISE FREQUENCY (kHz)
TEMPERATURE ERROR (200mVp-p
VCC = +5V
BYPASS CAP REMOVED
TEMPERATURE ERROR
vs. TEMPERATUREMAX6652 toc05
TEMPERATURE ERROR (
TEMPERATURE (°C)
PINNAMEFUNCTION12VINAnalog Input. Monitors 12V supply.2.5VINAnalog Input. Monitors 2.5V supply.3.3VINAnalog Input. Monitors 3.3V supply.N.C.No Connection. Can be connected to GND to improve thermal conductivity.GNDGroundALERTSMBus Alert (Interrupt) Output, Open Drain. Alerts the master that a temperature or voltage limit
has been violated.ADD
SMBus Address Select Input. ADD is sampled at the beginning of each IC-compatible/SMBus
transaction, and the 2 LSBs of the slave address register are detemined by ADD's connection to
GND, SDA, SCL, or VCC.SDAIC-Compatible/SMBus Serial Data InterfaceSCLIC-Compatible/SMBus Serial Clock InputVCCSupply Voltage Input, +2.7V to +5.5V. Also serves as a voltage monitor input. Bypass VCC to GND
with a 0.1µF capacitor.
Pin Description
Detailed DescriptionThe MAX6652 is a voltage and temperature monitor
designed to communicate through an I2C-compatible/
SMBus interface with an external microcontroller (µC).
A µC with no built-in I2C-compatibleor SMBus capabili-
ties can generate SMBus serial commands by “bit-
banging” general-purpose input-output (GPIO) pins.
The MAX6652 can monitor external supply voltages of typi-
cally 2.5V, 3.3V, and 12V, as well as its own supply voltage
and temperature. This makes it ideal for supervisor and
thermal management applications in telecommunications,
desktop and notebook computers, workstations, and net-
working equipment. All inputs are converted to an 8-bit
code using an ADC with an oversampling ratio of 8 to
improve noise rejection. The oversampling ratio can be
reduced by a factor of 4, with a corresponding reduc-
tion in the monitoring cycle time, by setting bit 5 of the
configuration register to 1. Each input voltage is scaled
down by an on-chip resistive divider so that its output,
at the nominal input voltage, is 3/4 of the ADC’s full-
scale range, or a decimal count of 192 (Table 3). Table
1 is the register map and Table 2 is the temperature
data format.
MAX6652emperature Sensor and System Monitor
in a 10-Pin µMAX
ADDRESSREAD/WRITEPOWER-ON DEFAULTDESCRIPTION20hR—Data register for 2.5 VIN measurement
21hR—Data register for 12VIN measurement
22hR—Data register for 3.3VIN measurement
23hR—Data register for VCC measurement
27hR—Data register for temperature measurement
2BhR/W1101 0011 (1.1 ✕ 2.5V)High limit for 2.5VIN
2ChR/W1010 1101 (0.9 ✕ 2.5V)Low limit for 2.5VIN
2DhR/W1101 0011 (1.1 ✕ 12V)High limit for 12VIN
2EhR/W1010 1101 (0.9 ✕ 12V)Low limit for 12VIN
2FhR/W1101 0011 (1.1 ✕ 3.3V)High limit for 3.3VIN
30hR/W1010 1101 (0.9 ✕ 3.3V)Low limit for 3.3VIN
31hR/W1101 0011 (1.1 ✕ 5V)High limit for VCC
32hR/W1010 1101 ✕ (0.9 ✕ 5V)Low limit for VCC
39hR/W0101 0000 ✕ (+80°C)Hot temperature limit
3AhR/W0100 0001 ✕ (+65°C)Hot temperature hysteresis
40hR/W0000 1000Configuration register
41hR0000 0000Interrupt status register
43hR/W0000 0000Interrupt mask register
48hR/W0010 1XXY
Device address register. The values of XX are
dependent on the status of the ADD pin.
Power-On Default ADD Connection 0010 100Y To GND
0010 101Y To VCC
0010 110Y To SDA
0010 111Y To SCL
Y (bit 0) is the SMBus read/write bit. When the 7-
bit chip address is read back from the serial
address register, an 8-bit word will be presented
with a 0 in bit 0 (Y).
4BhR/W0000 0000Temperature configuration register
Table 1. Register Map
MAX6652Writing a 1 to bit 0 of the configuration register starts
the monitoring function. The device will perform a
sequential sampling of all the inputs, starting with the
internal temperature sensor and continuing with 2.5VIN,
12VIN, 3.3VIN, and VCC. If the master terminates the
conversion, the sequential sampling will not stop until
the sampling cycle is completed and the results are
stored. When it starts again, it will always start with the
temperature measurement.
An interrupt signal is generated when a temperature
measurement goes above the hot limit or when a volt-
age measurement is either above the high limit or
below the low limit. This will cause the open-drain out-
put (ALERT)to go to the active-low state and set each
corresponding interrupt status bit (bits 0 through 4) to 1
(Table 5). The interrupt will be cleared by reading the
interrupt status register, except for temperature inter-
rupts generated in comparator mode. Reading the
interrupt status register also clears the register itself,
except for temperature interrupt bits set in comparator
mode.
Unless the fault is removed, the ALERToutput will only
remain cleared until the end of the next conversion
cycle where it will again be asserted. The ALERToutput
can also be masked by writing to the appropriate bits in
the interrupt mask register (Table 6) or by setting bit 1
of the configuration register (Table 4) to 0.
ADC and MultiplexerThe ADC integrates over a 66ms period, an integral
multiple of the line period with excellent noise rejection.
The internal oscillator is trimmed to produce a 66ms
conversion time for temperature and 33ms for each
voltage. This is equivalent to 4 and 2 cycles of 60Hz,
respectively, and provides protection against noise
pickup from the main supply. The internal oscillation
frequency can be changed to provide the same protec-
tion against 50Hz by setting bit 7 in the configuration
register to 1 (Table 4). The multiplexer automatically
sequences through the inputs, measuring voltages, and
temperature.
emperature Sensor and System Monitor
in a 10-Pin µMAX
TEMPERATURE
(°C)
DIGITAL
OUTPUT
(BINARY)
DIGITAL
OUTPUT
(HEX)+1250111 11017D
+250001 1001190000 0001010000 0000001111 1111FF
-251110 0111E7
-401101 1000D8
Table 2. Temperature Data Format
ADC OUTPUT
CODE
INPUT VOLTAGE AT
12VIN
INPUT VOLTAGE AT
2.5VIN
INPUT VOLTAGE AT
3.3VINVCCLSB weight62mV (12V/192)13mV (2.5V/192)17.2mV (3.3V/192)26mV (5.0V/192)< 62mV< 13mV< 17.2mV—62mV - 125mV13mV - 26mV17.2mV - 34.4mV—125mV - 187mV26mV - 39mV34.4mV - 51.6mV—————
64 (1/4 scale)4.000V - 4.063V833mV - 846mV1.100V - 1.117V—————
128 (1/2 scale)8.000V - 8.063V1.667V - 1.680V2.200V - 2.217V3.330V - 3.560V————
192 (3/4 scale)12.000V - 12.063V2.500V - 2.513V3.300V - 3.317V5.000V - 5.026V————
25315.813V - 15.875V3.294V - 3.307V4.348V - 4.366V6.566V - 6.615V
25415.875V - 15.938V3.572V - 3.586V4.366V - 4.383V6.615V - 6.640V
255> 15.938> 3.586> 4.383> 6.640
Table 3. Voltage Data Format
