General Description
The MAX6697 precision multichannel temperature sen-
sor monitors its own temperature and the temperatures
of up to six external diode-connected transistors. All
temperature channels have programmable alert thresh-
olds. Channels 1, 4, 5, and 6 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, OVERT and 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 MAX6697 is specified for an operating temperature
range of -40°C to +125°C and is available in 20-pin
QSOP and 20-pin TSSOP packages.
Applications
Desktop Computers
Notebook Computers
Workstations
Servers
Features
Six Thermal-Diode Inputs
Local Temperature Sensor
1°C Remote Temperature Accuracy (+60°C to
+100°C)
Temperature Monitoring Begins at POR for Fail-
Safe System Protection
ALERT and OVERT Outputs for Interrupts,
Throttling, and Shutdown
Small 20-Pin QSOP and 20-Pin TSSOP Packages
2-Wire SMBus Interface
MAX6697
7-Channel Precision Temperature Monitor
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
GND
SMBCLK
SMBDATA
DXN2
DXP2
DXN1
DXP1
V
CC
NC1
NC2DXN4
DXP4
DXN3
DXP3
12
11
9
10
DXP6
DXN6DXN5
DXP5
MAX6697
ALERT
OVERT
2200pF
2200pF
2200pF
2200pF
2200pF
CPU
DXP
DXN
GPU
2200pF
DXN
DXP
0.1μF
TO SYSTEM
SHUTDOWN
INTERRUPT
TO μP
DATA
CLK
4.7kΩ
EACH
+3.3V
Typical Application Circuit
19-3477; Rev 3; 5/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX6697EP_ _ -40°C to +125°C
20 QSOP
MAX6697UP_ _ -40°C to +125°C
20 TSSOP
SMBus is a trademark of Intel Corp.
*See the Slave Address section.
Pin Configuration appears at end of data sheet.
MAX6697
7-Channel Precision Temperature Monitor
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
V
CC
, SCK, SDA, ALERT, OVERT to GND ................-0.3V to +6V
DXP_ to GND..............................................-0.3V to (V
CC
+ 0.3V)
DXN_ to GND ........................................................-0.3V to +0.8V
SDA, ALERT, OVERT Current .............................-1mA to +50mA
DXN Current .......................................................................±1mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin QSOP
(derate 9.1mW/°C above +70°C) ......................727.3mW(E20-1)
20-Pin TSSOP
(derate 11.0mW/°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
(V
CC
= +3.0V to +5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
CC
3.0 5.5 V
Standby Supply Current I
SS
SMBus static 30 µA
Operating Current I
CC
During conversion 500 1000 µA
Channel 1 only 11
Temperature Resolution
Other diode channels 8
Bits
T
A
= T
RJ
= +60°C to +100°C -1.0 +1.0
T
A
= T
RJ
= 0°C to +125°C -3.0 +3.0
Remote Temperature Accuracy V
CC
= 3.3V
DXN_ grounded,
T
RJ
= T
A
= 0°C to +85°C
±2.5
o
C
T
A
= +60°C to +100°C -2.0 +2.0
Local Temperature Accuracy V
CC
= 3.3V
T
A
= 0°C to +125°C -3.0 +3.0
o
C
Supply Sensitivity of Temperature
Accuracy
±0.2
o
C/V
Resistance cancellation on 95 125 156
Remote Channel 1 Conversion
Time
t
CONV1
Resistance cancellation off 190 250 312
ms
Remote Channels 2 Through 6
Conversion Time
t
CONV_
95 125 156 ms
High level 80 100 120
Remote-Diode Source Current I
RJ
Low level 8 10 12
µA
Undervoltage-Lockout Threshold UVLO Falling edge of V
CC
disables ADC 2.30 2.80 2.95 V
Undervoltage-Lockout Hysteresis 90 mV
Power-On Reset (POR) Threshold V
CC
falling edge 1.2 2.0 2.5 V
POR Threshold Hysteresis 90 mV
ALERT, OVERT
I
SINK
= 1mA 0.3
Output Low Voltage V
OL
I
SINK
= 6mA 0.5
V
Output Leakage Current A
MAX6697
7-Channel Precision Temperature Monitor
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SMBus INTERFACE (SCL, SDA)
Logic-Input Low Voltage V
IL
0.8 V
V
CC
= 3.0V 2.2 V
Logic-Input High Voltage V
IH
V
CC
= 5.0V 2.4 V
Input Leakage Current -1 +1 µA
Output Low Voltage V
OL
I
SINK
= 6mA 0.3 V
Input Capacitance C
IN
5pF
SMBus-COMPATIBLE TIMING (Figures 3 and 4) (Note 2)
Serial Clock Frequency f
SCL
(Note 3) 400 kHz
f
SCL
= 100kHz 4.7
Bus Free Time Between STOP
and START Condition
t
BUF
f
SCL
= 400kHz 1.6
µs
f
SCL
= 100kHz 4.7
START Condition Setup Time
f
SCL
= 400kHz 0.6
µs
90% of SCL to 90% of SDA,
f
SCL
= 100kHz
0.6
Repeat START Condition Setup
Time
t
SU:STA
90% of SCL to 90% of SDA,
f
SCL
= 400kHz
0.6
µs
START Condition Hold Time t
HD:STA
10% of SDA to 90% of SCL 0.6 µs
90% of SCL to 90% of SDA,
f
SCL
= 100kHz
4
STOP Condition Setup Time t
SU:STO
90% of SCL to 90% of SDA,
f
SCL
= 400kHz
0.6
µs
10% to 10%, f
SCL
= 100kHz 1.3
Clock Low Period t
LOW
10% to 10%, f
SCL
= 400kHz 1.3
µs
Clock High Period t
HIGH
90% to 90% 0.6 µs
f
SCL
= 100kHz 300
Data Hold Time t
HD:DAT
f
SCL
= 400kHz (Note 4) 900
ns
f
SCL
= 100kHz 250
Data Setup Time t
SU:DAT
f
SCL
= 400kHz 100
ns
f
SCL
= 100kHz 1
Receive SCL/DSA Rise Time t
R
f
SCL
= 400kHz 0.3
µs
Receive SCL/SDA Fall Time t
F
300 ns
Pulse Width of Spike Suppressed t
SP
050ns
SMBus Timeout t
TIMEOUT
SDA low period for interface reset 25 37 45 ms
Note 1: All parameters are tested at T
A
= +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 t
TIMEOUT
.
Note 4: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL’s falling edge.

MAX6697UP38+T

Mfr. #:
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors 7Ch Precision Temperature Monitor
Lifecycle:
New from this manufacturer.
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