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MAX6642ATT90+ |MAX6642ATT90MAXIMN/a49avai±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm
MAX6642ATT92+ |MAX6642ATT92MAXIMN/a14avai±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm
MAX6642ATT94+ |MAX6642ATT94MAXIMN/a14avai±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm
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MAX6642ATT90+-MAX6642ATT92+-MAX6642ATT94+-MAX6642ATT98-MAX6642ATT98+T
±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm
MAX6642±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm

EVALUATION KIT AVAILABLE
General Description

The MAX6642 precise, two-channel digital temperature
sensor accurately measures the temperature of its own
die and a remote PN junction and reports the tempera-
ture data over a 2-wire serial interface. The remote PN
junction is typically a substrate PNP transistor on the
die of a CPU, ASIC, GPU, or FPGA. The remote PN
junction can also be a discrete diode-connected small-
signal transistor.
The 2-wire serial interface accepts standard system
management bus (SMBus™), Write Byte, Read Byte,
Send Byte, and Receive Byte commands to read the
temperature data and to program the alarm thresholds.
To enhance system reliability, the MAX6642 includes an
SMBus timeout. The temperature data format is 10 bit
with the least significant bit (LSB) corresponding to
+0.25°C. The ALERToutput asserts when the local or
remote overtemperature thresholds are violated. A fault
queue may be used to prevent the ALERToutput from
setting until two consecutive faults have been detected.
Measurements can be done autonomously or in a sin-
gle-shot mode.
Remote accuracy is ±1°C maximum error between
+60°C and +100°C. The MAX6642 operates from -40°C
to +125°C, and measures remote temperatures
between 0°C and +150°C. The MAX6642 is available in
a 6-pin TDFN package with an exposed pad.
Applications

Desktop Computers
Notebook Computers
Servers
Thin Clients
Test and Measurement
Workstations
Graphic Cards
Benefits and Features
Integrated Temperature Sensor Enables Simultaneous
Dual Temperature (Remote and Local) MeasurementsRemote Accuracy ±1°CLocal Accuracy ±2°C from +60°C to +100°CMeasures Remote Temperature up to +150°C0.25°C ResolutionDual Zone Monitoring Automates Over-Temperature
AlarmsProgrammable Remote/Local Temperature
ThresholdsALERT OutputSmall Footprint3mm x 3mm TDFN Package with Exposed PadLow Thermal Mass Reduces Measurement LatencySMBus/I2C Address Hardwired
Ordering Information
PARTTEMP RANGEPIN-PACKAGE

MAX6642ATT90-T-40°C to +125°C6 TDFN-EP*
MAX6642ATT92-T-40°C to +125°C6 TDFN-EP*
MAX6642ATT94-T-40°C to +125°C6 TDFN-EP*
MAX6642ATT96-T-40°C to +125°C6 TDFN-EP*
MAX6642ATT98-T-40°C to +125°C6 TDFN-EP*
MAX6642ATT9A-T-40°C to +125°C6 TDFN-EP*
MAX6642ATT9C-T-40°C to +125°C6 TDFN-EP*
MAX6642ATT9E-T-40°C to +125°C6 TDFN-EP*
MAX66422200pF
0.1µF
DXP
GND
SDA
SCLK
ALERT
DATA
CLOCK
INTERRUPT TO µP
47Ω
10kΩ EACH
3.3V
VCC
Typical Operating Circuit
PARTMEASURED TEMP RANGETOP
MARK

MAX6642ATT90-T0°C to +150°CAFC
MAX6642ATT92-T0°C to +150°CAFD
MAX6642ATT94-T0°C to +150°CAFE
MAX6642ATT96-T0°C to +150°CAFF
MAX6642ATT98-T0°C to +150°CAEW
MAX6642ATT9A-T0°C to +150°CAFG
MAX6642ATT9C-T0°C to +150°CAFH
MAX6642ATT9E-T0°C to +150°CAFI
Selector Guide

T = Tape and reel.
*EP = Exposed pad.
Pin Configuration and Functional Diagram appear at end of
data sheet.
MAX6642±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
Absolute Maximum Ratings
Electrical Characteristics

(VCC = +3.0V to +5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = +3.3V and 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.
All Voltages Referenced to GND
VCC...........................................................................-0.3V to +6V
DXP.............................................................-0.3V to (VCC+ 0.3V)
SCLK, SDA, ALERT..................................................-0.3V to +6V
SDA, ALERTCurrent...........................................-1mA to +50mA
Continuous Power Dissipation (TA= +70°C)
6-Pin TDFN (derate 24.4mW/°C above +70°C).........1951mW
ESD Protection (all pins, Human Body Model)................±2000V
Junction Temperature......................................................+150°C
Operating Temperature Range.........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply VoltageVCC3.05.5V
0.25°CTemperature Resolution10Bits
TRJ = +60°C to +100°C,
TA = +25°C to +85°C-1.0+1.0
TRJ = 0°C to +125°C-3.0+3.0Remote Temperature ErrorVCC = 3.3V
TRJ = +125°C to +150°C-3.5+3.5
TA = +60°C to +100°C-2.0+2.0Local Temperature ErrorVCC = 3.3VTA = 0°C to +125°C-3.0+3.0°C
Supply Sensitivity of Temperature
Error±0.2°C/V
Undervoltage Lockout ThresholdUVLOFalling edge of VCC disables ADC2.42.72.95V
Undervoltage Lockout Hysteresis90mV
Power-On-Reset (POR) ThresholdVCC falling edge1.52.02.4V
POR Threshold Hysteresis90mV
Standby Supply CurrentSMBus static310µA
Operating CurrentDuring conversion0.51.0mA
Average Operating Current260µA
Conversion TimetCONVFrom stop bit to conversion completion106125143ms
Conversion RatefCONV8Hz
High level80100120Remote-Diode Source CurrentIRJLow level81012µA
ALERT
VOL = 0.4V1Output-Low Sink CurrentVOL = 0.6V4mA
Output-High Leakage CurrentVOH = VCC1µA
MAX6642±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
Note 1:
All parameters tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2:
Timing specifications guaranteed by design.
Note 3:
The serial interface resets when SCLK 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 SCLK’s falling edge.
Electrical Characteristics (continued)

(VCC = +3.0V to +5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = +3.3V and TA = +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SMBus-COMPATIBLE INTERFACE (SCLK and SDA)

Logic Input Low VoltageVIL0.8V
Logic Input High VoltageVIHVCC = 3.0V2.2V
Input Leakage CurrentILEAKVIN = GND or 5.5V-1+1µA
Output Low Sink CurrentIOLVOL = 0.6V6mA
Input CapacitanceCIN5pF
SMBus TIMING (Note 2)

Serial Clock FrequencyfSCLK(Note 3)100kHz
Bus Free Time Between STOP
and START ConditiontBUF4.7µs
START Condition Setup Time4.7µs
Repeat START Condition Setup
TimetSU:STA90% to 90%50ns
START Condition Hold TimetHD:STA10% of SDA to 90% of SCLK4µs
STOP Condition Setup TimetSU:STO90% of SCLK to 90% of SDA4µs
Clock Low PeriodtLOW10% to 10%4.7µs
Clock High PeriodtHIGH90% to 90%4µs
Data Setup TimetHD:DAT(Note 4)250µs
Receive SCLK/SDA Rise TimetR1µs
Receive SCLK/SDA Fall TimetF300ns
Pulse Width of Spike SuppressedtSP050ns
SMBus TimeouttTIMEOUTSDA low period for interface reset202840ms
MAX6642±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
STANDBY SUPPLY CURRENT
vs. CLOCK FREQUENCY
MAX6642 toc01
CLOCK FREQUENCY (kHz)
SUPPLY CURRENT (
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE

MAX6642 toc02
TEMPERATURE (°C)
TEMPERATURE ERROR (
2N3906125
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE

MAX 6642 toc03
TEMPERATURE (°C)
TEMPERATURE ERROR (2575100
TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6642 toc04
FREQUENCY (kHz)
TEMPERATURE ERROR (
VIN = 100mVP-P SQUARE WAVE
APPLIED TO VCC WITH NO BYPASS CAPACITOR
LOCAL ERROR
REMOTE ERROR
TEMPERATURE ERROR
vs. DXP NOISE FREQUENCY
MAX6642 toc05
TEMPERATURE ERROR (
LOCAL ERROR
REMOTE ERROR
VIN = AC-COUPLED TO DXP
VIN = 100mVP-P SQUARE WAVE
Typical Operating Characteristics

(VCC= 3.3V, TA= +25°C, unless otherwise noted.)
TEMPERATURE ERROR
vs. DXP-GND CAPACITANCE
MAX6642 toc06
TEMPERATURE ERROR (
MAX6642±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
Detailed Description

The MAX6642 is a temperature sensor for local
and remote temperature-monitoring applications.
Communication with the MAX6642 occurs through the
SMBus-compatible serial interface and dedicated alert
pins. ALERTasserts if the measured local or remote
temperature is greater than the software-programmed
ALERTlimit.
The MAX6642 converts temperatures to digital data
either at a programmed rate of eight conversions per
second or in single conversions. Temperature data is
represented by 8 data bits (at addresses 00h and 01h),
with the LSB equal to +1°C and the MSB equal to
+128°C. Two additional bits of remote temperature data
are available in the “extended” register at address 10h
and 11h (Table 2) providing resolution of +0.25°C.
ADC and Multiplexer

The averaging ADC integrates over a 60ms period
(each channel, typ), with excellent noise rejection.
The multiplexer automatically steers bias currents
through the remote and local diodes. The ADC and
associated circuitry measure each diode’s forward volt-
age and compute the temperature based on this volt-
age. Both channels are automatically converted once
the conversion process has started, either in free-run-
ning or single-shot mode. If one of the two channels is
not used, the device still performs both measurements,
and the user can ignore the results of the unused chan-
nel. If the remote-diode channel is unused, connect
DXP to GND rather than leaving DXP open.
The conversion time per channel (remote and internal)
is 125ms. If both channels are being used, then each
channel is converted four times per second. If the
remote temperature is measured eight times per sec-
ond. The results of the previous conversion are always
available, even if the ADC is busy.
Low-Power Standby Mode

Standby mode reduces the supply current to less than
10µA by disabling the ADC and timing circuitry. Enter
standby mode by setting the RUNbit to 1 in the config-
uration byte register (Table 4). All data is retained in
memory, and the SMBus interface is active and listen-
ing for SMBus commands. Standby mode is not a shut-
down mode. With activity on the SMBus, the device
draws more supply current (see the Typical Operating
Characteristics). In standby mode, the MAX6642 can
be forced to perform ADC conversions through the
one-shot command, regardless of the RUNbit status.
If a standby command is received while a conversion is
in progress, the conversion cycle is truncated, and the
data from that conversion is not latched into a tempera-
ture register. The previous data is not changed and
remains available.
Supply-current drain during the 125ms conversion peri-
od is 500µA (typ). In standby mode, supply current
drops to 3µA (typ).
SMBus Digital Interface

From a software perspective, the MAX6642 appears as
a set of byte-wide registers that contain temperature
data, alarm threshold values, and control bits. A stan-
dard SMBus-compatible 2-wire serial interface is used
to read temperature data and write control bits and
alarm threshold data.
The MAX6642 employs four standard SMBus protocols:
Write Byte, Read Byte, Send Byte, and Receive Byte.
(Figures 1, 2, and 3). The shorter Receive Byte protocol
Pin Description
PINNAMEFUNCTION

1VCCSupply Voltage Input, +3V to +5.5V. Bypass VCC to GND with a 0.1µF capacitor. A 47Ω series resistor is
recommended but not required for additional noise filtering.GNDGroundDXPCombined Remote-Diode Current Source and ADC Input for Remote-Diode Channel. Place a 2200pF
capacitor between DXP and GND for noise filtering.SCLKSMBus Serial-Clock Input. May be pulled up to +5.5V regardless of VCC.SDASMBus Serial-Data Input/Output, Open Drain. May be pulled up to +5.5V regardless of VCC.ALERTSMBus Alert (Interrupt) Output, Open Drain. ALERT asserts when temperature exceeds user-set limits. See
the ALERT Interrupts section.
—EPExposed Pad. Internally connected to GND. Connect to a PCB ground pad for optimal performance. Not
intended as an electrical connection point.
MAX6642±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature AlarmADDRESSWRACKACKPDATAACKCOMMAND
7 BITS18 BITS8 BITS
SLAVE ADDRESS: EQUIVA-
LENT TO CHIP-SELECT LINE OF
A 3-WIRE INTERFACE
DATA BYTE: DATA GOES INTO THE REGISTER
SET BY THE COMMAND BYTE (TO SET
THRESHOLDS, CONFIGURATION MASKS, AND
SAMPLING RATE)
WRITE BYTE FORMATADDRESSADDRESSWRACKACKPSRDACK///DATACOMMAND

7 BITS7 BITS8 BITS8 BITS
READ BYTE FORMAT

SLAVE ADDRESS: EQUIVA-
LENT TO CHIP SELECT LINE
COMMAND BYTE: SELECTS
WHICH REGISTER YOU ARE
REDING FROMADDRESSWRACKACKCOMMAND
7 BITS8 BITS
SEND BYTE FORMAT

COMMAND BYTE: SENDS COM-
MAND WITH NO DATA, USUALLY
USED FOR ONE-SHOT COMMANDADDRESSRDACK///DATA
7 BITS8 BITS
RECEIVE BYTE FORMAT

DATA BYTE: READS DATA FROM
THE REGISTER COMMANDED
BY THE LAST READ BYTE OR
WRITE BYTE TRANSMISSION;
ALSO USED FOR SMBUS ALERT
RESPONSE RETURN ADDRESS
SLAVE ADDRESS: REPEATED
DUE TO CHANGE IN DATA-
FLOW DIRECTION
DATA BYTE: READS FROM
THE REGISTER SET BY THE
COMMAND BYTE
S = START CONDITION
P = STOP CONDITION
SHADED = SLAVE TRANSMISSION
/// = NOT ACKNOWLEDGED
Figure 1. SMBus Protocols
SMBCLK
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 = SLAVE PULLS DATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTO MASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION
M = NEW START CONDITION
Figure 2. SMBus Write Timing Diagram
MAX6642±1°C, SMBus-Compatible Remote/
Local Temperature Sensor with
Overtemperature Alarm
register was previously selected by a Write Byte
instruction. Use caution when using the shorter proto-
cols in multimaster systems, as a second master could
overwrite the command byte without informing the first
master.
Read temperature data from the read internal tempera-
ture (00h) and read external temperature (01h) regis-
ters. The temperature data format for these registers is
8 bits for each channel, with the LSB representing +1°C
(Table 1).
Read the additional bits from the read extended tem-
perature byte register (10h, 11h), which extends the
data to 10 bits and the resolution to +0.25°C per LSB
(Table 2).
When a conversion is complete, the main temperature
register and the extended temperature register are
updated.
Alarm Threshold Registers

Two registers store ALERTthreshold values—one each
for the local and remote channels. If either measured
temperature equals or exceeds the corresponding
ALERTthreshold value, the ALERTinterrupt asserts
unless the ALERTbit is masked.
The power-on-reset (POR) state of the local ALERT
THIGHregister is +70°C (0100 0110). The POR state of
the remote ALERTTHIGHregister is +120°C (0111 1000).
Diode Fault Detection

A continuity fault detector at DXP detects an open cir-
cuit on DXP, or a DXP short to VCCor GND. If an open
or short circuit exists, the external temperature register
is loaded with 1111 1111 and status bit 2 (OPEN) of the
status byte is set to 1. Immediately after POR, the status
register indicates that no fault is present. If a fault is
present upon power-up, the fault is not indicated until
the end of the first conversion. Diode faults do not set
the ALERToutput.
ALERTInterrupts

The ALERTinterrupt occurs when the internal or external
temperature reading exceeds a high temperature limit
(user programmed). The ALERTinterrupt output signal is
latched and can be cleared only by reading the status
register after the fault condition no longer exists or by
successfully responding to the alert response address. If
SMBCLKCDEFGHI
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 K
F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = ACKNOWLEDGE CLOCK PULSE
J = STOP CONDITION
K = NEW START CONDITION
Figure 3. SMBus Read Timing Diagram
TEMP (°C)DIGITAL OUTPUT

130.001 000 0010
127.000 111 1111
126.000 111 11100 001 1001
0.000 000 0000
<0.000 000 0000
Diode fault (short or open)1 111 1111
Table 1. Main Temperature Register
(High Byte) Data Format
FRACTIONAL TEMP (°C)DIGITAL OUTPUT

0.00000XX XXXX
0.25001XX XXXX
0.50010XX XXXX
0.75011XX XXXX
Table 2. Extended Resolution
Temperature Register (Low Byte)
Data Format
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