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MAX6699EE99+-MAX6699EE99+T-MAX6699UE34+
5-Channel Precision Temperature Monitor
General DescriptionThe MAX6699 precision multichannel temperature sen-
sor monitors its own temperature and the temperatures
of up to four external diode-connected transistors.
All temperature channels have programmable alert
thresholds. Channels 1 and 4 also have programmable
overtemperature thresholds. When the measured tem-
perature of a channel exceeds the respective thresh-
old, a status bit is set in one of the status registers. Two
open-drain outputs, OVERTand ALERT, assert corre-
sponding to these bits in the status register.
The 2-wire serial interface supports the standard system
management bus (SMBus™) protocols: write byte, read
byte, send byte, and receive byte for reading the tem-
perature data and programming the alarm thresholds.
The MAX6699 is specified for an operating temperature
range of -40°C to +125°C and is available in 16-pin
QSOP and 16-pin TSSOP packages.
ApplicationsDesktop Computers
Notebook Computers
Workstations
Servers
FeaturesFour Thermal-Diode InputsLocal Temperature Sensor1°C Remote Temperature Accuracy (+60°C to +100°C)Temperature Monitoring Begins at POR for Fail-Safe
System ProtectionALERT
and OVERTOutputs for Interrupts, Throttling,
and ShutdownSmall 16-Pin QSOP and 16-Pin TSSOP Packages2-Wire SMBus Interface
MAX6699
5-Channel Precision Temperature Monitor
Ordering InformationGND
SMBCLK
SMBDATA
DXN2
DXP2
DXN1
DXP1
VCC
N.C.1
N.C.2DXN4
DXP4
DXN3
DXP3
MAX6699
ALERT
OVERT
2200pF
2200pF
2200pF
2200pF
CPU
0.1µF
TO SYSTEM
SHUTDOWN
INTERRUPT
TO µP
DATA
CLK
4.7kΩ
EACH
+3.3V
Typical Application Circuit19-3859; Rev 2; 7/07
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODEMAX6699EE_ _-40°C to +125°C16 QSOPE16-1
MAX6699UE_ _-40°C to +125°C16 TSSOPU16-1
SMBus is a trademark of Intel Corp.
See theSlave Addresssection.
Pin Configuration appears at end of data sheet.
MAX6699
5-Channel Precision Temperature Monitor
ABSOLUTE MAXIMUM RATINGSStresses 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, SCK, SDA, ALERT, OVERTto GND ................-0.3V to +6V
DXP_ to GND..............................................-0.3V to (VCC+ 0.3V)
DXN_ to GND........................................................-0.3V to +0.8V
SDA, ALERT, OVERTCurrent.............................-1mA to +50mA
DXN Current.......................................................................±1mA
Continuous Power Dissipation (TA= +70°C)
16-Pin QSOP
(derate 8.30mW/°C above +70°C)....................727.3mW(E20-1)
16-Pin TSSOP
(derate 9.40mW/°C above +70°C)..................879.1mW(U20-2)
ESD Protection (all pins, Human Body Model)................±2000V
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(VCC= +3.0V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply VoltageVCC3.05.5V
Standby Supply CurrentISSSMBus static30µA
Operating CurrentICCDuring conversion5001000µA
Channel 1 only11Temperature ResolutionOther diode channels8Bits
TA = TRJ = +60°C to +100°C-1.0+1.0
TA = TRJ = 0°C to +125°C-3.0+3.0Remote Temperature AccuracyVCC = 3.3V
DXN_ grounded,
TRJ = TA = 0°C to +85°C±2.5C
TA = +60°C to +100°C-2.0+2.0Local Temperature AccuracyVCC = 3.3VTA = 0°C to +125°C-3.0+3.0C
Supply Sensitivity of Temperature
Accuracy±0.2oC/V
Resistance cancellation on95125156Remote Channel 1 Conversion
TimetCONV1Resistance cancellation off190250312ms
Remote Channels 2 Through 4
Conversion TimetCONV_95125156ms
High level80100120Remote-Diode Source CurrentIRJLow level81012µA
Undervoltage-Lockout ThresholdUVLOFalling edge of VCC disables ADC2.302.802.95V
Undervoltage-Lockout Hysteresis90mV
Power-On Reset (POR) ThresholdVCC falling edge1.22.02.5V
POR Threshold Hysteresis90mV
ALERT, OVERT
ISINK = 1mA0.3Output Low VoltageVOLISINK = 6mA0.5V
Output Leakage Current1µA
MAX6699
5-Channel Precision Temperature Monitor
ELECTRICAL CHARACTERISTICS (continued)(VCC= +3.0V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SMBus INTERFACE (SCL, SDA)Logic-Input Low VoltageVIL0.8V
VCC = 3.0V2.2VLogic-Input High VoltageVIHVCC = 5.0V2.4V
Input Leakage Current-1+1µA
Output Low VoltageVOLISINK = 6mA0.3V
Input CapacitanceCIN5pF
SMBus-COMPATIBLE TIMING (Figures 3 and 4) (Note 2)Serial Clock FrequencyfSCL(Note 3)400kHz
fSCL = 100kHz4.7Bus Free Time Between STOP
and START ConditiontBUFfSCL = 400kHz1.6µs
fSCL = 100kHz4.7START Condition Setup TimefSCL = 400kHz0.6µs
90% of SCL to 90% of SDA,
fSCL = 100kHz0.6
Repeat START Condition Setup
TimetSU:STA
90% of SCL to 90% of SDA,
fSCL = 400kHz0.6
START Condition Hold TimetHD:STA10% of SDA to 90% of SCL0.6µs
90% of SCL to 90% of SDA,
fSCL = 100kHz4
STOP Condition Setup TimetSU:STO
90% of SCL to 90% of SDA,
fSCL = 400kHz0.6
10% to 10%, fSCL = 100kHz1.3Clock Low PeriodtLOW10% to 10%, fSCL = 400kHz1.3µs
Clock High PeriodtHIGH90% to 90%0.6µs
fSCL = 100kHz300Data Hold TimetHD:DATfSCL = 400kHz (Note 4)900ns
fSCL = 100kHz250Data Setup TimetSU:DATfSCL = 400kHz100ns
fSCL = 100kHz1Receive SCL/DSA Rise TimetRfSCL = 400kHz0.3µs
Receive SCL/SDA Fall TimetF300ns
Pulse Width of Spike SuppressedtSP050ns
SMBus TimeouttTIMEOUTSDA low period for interface reset253745ms
Note 1:All parameters are tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2:Timing specifications are guaranteed by design.
Note 3:The serial interface resets when SCL is low for more than tTIMEOUT.
Note 4:A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL’s falling edge.
MAX6699
5-Channel Precision Temperature Monitor
Typical Operating Characteristics(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGEMAX6699 toc01
SUPPLY VOLTAGE (V)
STANDBY SUPPLY CURRENT (
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6699 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6699 toc03
REMOTE-DIODE TEMPERATURE (°C)
TEMPERATURE ERROR (
°C)255075100125
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATUREMAX6699 toc04
DIE TEMPERATURE (°C)
TEMPERATURE ERROR (
°C)
REMOTE-DIODE TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCYMAX6699 toc05
FREQUENCY (MHz)
TEMPERATURE ERROR (
°C)
100mVP-P
LOCAL TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCYMAX6699 toc06
FREQUENCY (MHz)
TEMPERATURE ERROR (
°C)
100mVP-P
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCYMAX6699 toc07
FREQUENCY (MHz)
TEMPERATURE ERROR (
°C)0.10.01
100mVP-P
MAX6699
5-Channel Precision Temperature Monitor
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCYMAX6699 toc08
FREQUENCY (MHz)
TEMPERATURE ERROR (0.10.01
100mVP-P
ypical Operating Characteristics (continued)(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCEMAX6699 toc09
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR (
°C)
Pin Description
PINNAMEFUNCTIONDXP1
Combined Current Source and A/D Positive Input for Channel 1 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to VCC if no
remote diode is used. Place a 2200pF capacitor between DXP1 and DXN1 for noise filtering.DXN1Cathode Input for Channel 1 Remote Diode. Connect the cathode of the channel 1 remote-diode-
connected transistor to DXN1.DXP2
Combined Current Source and A/D Positive Input for Channel 2 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to VCC if no
remote diode is used. Place a 2200pF capacitor between DXP2 and DXN2 for noise filtering.DXN2Cathode Input for Channel 2 Remote Diode. Connect the cathode of the channel 2 remote-diode-
connected transistor to DXN2.DXP3
Combined Current Source and A/D Positive Input for Channel 3 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to VCC if no
remote diode is used. Place a 2200pF capacitor between DXP3 and DXN3 for noise filtering.DXN3Cathode Input for Channel 3 Remote Diode. Connect the cathode of the channel 1 remote-diode-
connected transistor to DXN3.
MAX6699
Detailed DescriptionThe MAX6699 is a precision multichannel temperature
monitor that features one local and four remote temper-
ature-sensing channels with a programmable alert
threshold for each temperature channel and a program-
mable overtemperature threshold for channels 1 and 4
(see Figure 1). Communication with the MAX6699 is
achieved through the SMBus serial interface and a
dedicated alert pin. The alarm outputs, OVERTand
ALERT, assert if the software-programmed temperature
thresholds are exceeded. ALERTtypically serves as an
interrupt, while OVERTcan be connected to a fan, sys-
tem shutdown, or other thermal-management circuitry.
ADC Conversion SequenceIn the default conversion mode, the MAX6699 starts the
conversion sequence by measuring the temperature on
channel 1, followed by 2, 3, and local channel 4. The
conversion result for each active channel is stored in
the corresponding temperature data register.
In some systems, one of the remote thermal diodes may
be monitoring a location that experiences temperature
changes that occur much more rapidly than in the other
channels. If faster temperature changes must be moni-
tored in one of the temperature channels, the MAX6699
allows channel 1 to be monitored at a faster rate than
the other channels. In this mode (set by writing a 1 to bit
4 of the configuration 1 register), measurements of
channel 1 alternate with measurements of the other
channels. The sequence becomes channel 1, channel
2, channel 1, channel 3, channel 1, etc. Note that the
time required to measure all five channels is consider-
ably greater in this mode than in the default mode.
Low-Power Standby ModeStandby mode reduces the supply current to less than
15µA by disabling the internal ADC. Enter standby by
setting the STOP bit to 1 in the configuration 1 register.
During standby, data is retained in memory, and the
SMBus interface is active and listening for SMBus com-
mands. The timeout is enabled if a start condition is rec-
ognized on SMBus. Activity on the SMBus causes the
supply current to increase. If a standby command is
received while a conversion is in progress, the conver-
sion cycle is interrupted, and the temperature registers
are not updated. The previous data is not changed and
remains available.
5-Channel Precision Temperature Monitor
PINNAMEFUNCTIONDXP4
Combined Current Source and A/D Positive Input for Channel 4 Remote Diode. Connect to the anode
of a remote-diode-connected temperature-sensing transistor. Leave floating or connect to VCC if no
remote diode is used. Place a 2200pF capacitor between DXP4 and DXN4 for noise filtering.DXN4Cathode Input for Channel 4 Remote Diode. Connect the cathode of the channel 1 remote-diode-
connected transistor to DXN4.
9, 10N.C._No Connection. Must be connected to ground.OVERTOvertemperature Active-Low, Open-Drain Output. OVERT asserts low when the temperature of
channels 1 and 4 exceeds the programmed threshold limit.VCCSupply Voltage Input. Bypass to GND with a 0.1µF capacitor.ALERTSMBus Alert (Interrupt), Active-Low, Open-Drain Output. ALERT asserts low when the temperature of
any channel exceeds the programmed ALERT threshold.SMBDATASMBus Serial-Data Input/Output. Connect to a pullup resistor.SMBCLKSMBus Serial-Clock Input. Connect to a pullup resistor.GNDGround
Pin Description (continued)
SMBus Digital InterfaceFrom a software perspective, the MAX6699 appears as
a series of 8-bit registers that contain temperature-mea-
surement data, alarm threshold values, and control bits.
A standard SMBus-compatible 2-wire serial interface is
used to read temperature data and write control bits
and alarm threshold data. The same SMBus slave
address also provides access to all functions.
The MAX6699 employs four standard SMBus protocols:
write byte, read byte, send byte, and receive byte
(Figure 2). The shorter receive-byte protocol allows
quicker transfers, provided that the correct data regis-
ter was previously selected by a read byte instruction.
Use caution with the shorter protocols in multimaster
systems, since a second master could overwrite the
command byte without informing the first master. Figure
3 is the SMBus write timing diagram, and Figure 4 is
theSMBus read timing diagram.
The remote diode 1 measurement channel provides 11
bits of data (1 LSB = 0.125°C). All other temperature-
measurement channels provide 8 bits of temperature
data (1 LSB = 1°C). The 8 most significant bits (MSBs)
can be read from the local temperature and remote
temperature registers. The remaining 3 bits for remote
diode 1 can be read from the extended temperature
register. If extended resolution is desired, the extended
resolution register should be read first. This prevents
the most significant bits from being overwritten by new
MAX6699
5-Channel Precision Temperature MonitorFigure 1. Internal Block Diagram
DXP1
DXN1
DXP2
DXN2
DXP3
DXN3
DXP4
DXN4
INPUT
BUFFER
10/100µA
VCC
REF
COUNT
COUNTER
COMMAND BYTE
REMOTE TEMPERATURES
LOCAL TEMPERATURES
REGISTER BANK
ALERT THRESHOLD
OVERT THRESHOLD
ALERT RESPONSE ADDRESS
ALARM
ALU
ADC
SMBus
INTERFACE
MAX6699
SCLSDA
OVERT
AVERT
MAX6699conversion results until they have been read. If the
most significant bits have not been read within an
SMBus timeout period (nominally 37ms), normal updat-
ing continues. Table 1 shows the main temperature
register (high byte) data format, and Table 2 shows the
extended resolution register (low byte) data format.
Diode Fault DetectionIf a channel’s input DXP_ and DXN_ are left open, the
MAX6699 detects a diode fault. An open diode fault does
not cause either ALERTor OVERTto assert. A bit in the sta-
tus register for the corresponding channel is set to 1 and
the temperature data for the channel is stored as all 1s
(FFh). It takes approximately 4ms for the MAX6699 to
detect a diode fault. Once a diode fault is detected, the
MAX6699 goes to the next channel in the conversion
sequence. Depending on operating conditions, a shorted
5-Channel Precision Temperature Monitor
Write Byte Format
Read Byte Format
Send Byte FormatReceive Byte FormatSlave Address: equiva-
lent to chip-select line of
a 3-wire interface
Command Byte: selects to
which register you are writing
Data Byte: data goes into the register
set by the command byte (to set
thresholds, configuration masks, and
sampling rate)
Slave Address: equiva-
lent to chip-select line
Command Byte: selects
from which register you
are reading
Slave Address: repeated
due to change in data-
flow direction
Data Byte: reads from
the register set by the
command byte
Command Byte: sends com-
mand with no data, usually
used for one-shot command
Data Byte: reads data from
the register commanded
by the last read byte or
write byte transmission;
also used for SMBus alert
response return addressS = Start conditionShaded = Slave transmission
P = Stop condition/// = Not acknowledged
ADDRESSRDACKDATA///P7 bits8 bits
SACKCOMMANDACKP8 bits
ADDRESS7 bits
ACKDATA8 bits
ACKCOMMAND8 bits
ACKWRADDRESS7 bits
ADDRESSWRACKCOMMANDACKSADDRESS7 bits8 bits7 bits
ACKDATA8 bits
///PFigure 2. SMBus Protocols
TEMP (°C)DIGITAL OUTPUT>1270111 1111
1270111 1111
1260111 11100001 1001
0.000000 0000
<0.000000 0000
Diode fault (open)1111 1111
Diode fault (short)1111 1111 or 1110 1110
Table 1. Main Temperature Register
(High Byte) Data Format
TEMP (°C)DIGITAL OUTPUT000X XXXX
+0.125001X XXXX
+0.250010X XXXX
+0.375011X XXXX
+0.500100X XXXX
+0.625101X XXXX
+0.725110X XXXX
+0.875111X XXXX
Table 2. Extended Resolution Temperature
Register (Low Byte) Data Format
diode may or may not cause ALERTor OVERTto assert,
so if a channel will not be used, disconnect its DXP and
DXN inputs.
Alarm Threshold RegistersThere are 9 alarm threshold registers that store over-
temperature ALERTand OVERTthreshold values.
Seven of these registers are dedicated to store one
local alert temperature threshold limit and six remote
alert temperature threshold limits (see the ALERT
Interrupt Modesection). The remaining two registers
are dedicated to remote channels 1 and 4 to store
overtemperature threshold limits (see theOVERT
Overtemperature Alarmsection). Access to these regis-
ters is provided through the SMBusinterface.
ALERTInterrupt ModeAn ALERTinterrupt occurs when the internal or external
temperature reading exceeds a high-temperature limit
(user programmable). The ALERTinterrupt output signal
can be cleared by reading the status register(s) associ-
ated with the fault(s) or by successfully responding to an
alert response address transmission by the master.In
both cases, the alert is cleared, but is reasserted at the
end of the next conversion if the fault condition still
exists. The interrupt does not halt automatic conversions.
The ALERToutput is open drain so that multiple devices
can share a common interrupt line. All ALERTinterrupts
can be masked using the configuration 3 register. The
POR state of these registers is shown in Table 3.
MAX6699
5-Channel Precision Temperature MonitorSMBCLK
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVECDEFGHIJ
SMBDATA
tSU:STAtHD:STA
tLOWtHIGH
tSU:DATtSU:STOtBUFK
E = SLAVE PULLS SMBDATA LINE LOW
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO SLAVE
H = LSB OF DATA CLOCKED INTO SLAVE
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
Figure 3. SMBus Write Timing Diagram
SMBCLKCDEFGHIJK
SMBDATA
tSU:STAtHD:STA
tLOWtHIGH
tSU:DATtHD:DATtSU:STOtBUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SMBDATA LINE LOW M
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
Figure 4. SMBus Read Timing Diagram
MAX6699
5-Channel Precision Temperature Monitor
REGISTERADDRESS
(HEX)
POR STATE
(HEX)
READ/
WRITEDESCRIPTIONLocal0700RRead local temperature register
Remote 10100RRead channel 1 remote temperature register
Remote 20200RRead channel 2 remote temperature register
Remote 30300RRead channel 3 remote temperature register
Remote 40400RRead channel 4 remote temperature register
Reserved0500R—
Reserved0600R—
Configuration 14100R/WRead/write configuration register 1
Configuration 24200R/WRead/write configuration register 2
Configuration 34300R/WRead/write configuration register 3
Status14400RRead status register 1
Status24500RRead status register 2
Status34600RRead status register 3
Local ALERT High Limit175AR/WRead/write local alert high-temperature threshold limit register
Remote 1 ALERT High Limit116ER/WRead/write channel 1 remote-diode alert high-temperature
threshold limit register
Remote 2 ALERT High Limit127FR/WRead/write channel 2 remote-diode alert high-temperature
threshold limit register
Remote 3 ALERT High Limit1364R/WRead/write channel 3 remote-diode alert high-temperature
threshold limit register
Remote 4 ALERT High Limit1464R/WRead/write channel 4 remote-diode alert high-temperature
threshold limit register
Reserved1564R/W—
Reserved1664R/W—
Remote 1 OVERT High Limit216ER/WRead/write channel 1 remote-diode overtemperature threshold
limit register
Remote 4 OVERT High Limit247FR/WRead/write channel 4 remote-diode overtemperature threshold
limit register
Reserved255AR/W—
Reserved265AR/W—
Remote 1 Extended
Temperature0900RRead channel 1 remote-diode extended temperature register
Manufacturer ID0A4DRRead manufacturer ID
Table 3. Command Byte Register Bit Assignment
