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MAX6698EE38+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
General Description
The MAX6698 precision multichannel temperature sen-
sor monitors its own temperature, the temperatures of
three external diode-connected transistors, and the
temperatures of three thermistors. All temperature
channels have programmable alert thresholds.
Channels 1, 4, 5, and 6 also have programmable over-
temperature thresholds. When the measured tempera-
ture of a channel exceeds the respective threshold, a
status bit is set in one of the status registers. Two open-
drain outputs, OVERT and ALERT, assert correspond-
ing 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 MAX6698 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.
Applications
Desktop Computers Workstations
Notebook Computers Servers
Features
♦ Three Thermal-Diode Inputs and Three Thermistor
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 16-Pin QSOP and 16-Pin TSSOP Packages
♦ 2-Wire SMBus Interface
MAX6698
7-Channel Precision Remote-Diode, Thermistor,
and Local Temperature Monitor
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
16
+3.3V
15
14
13
12
11
10
9
1
2
3
4
5
6
R
EX3
R
THER3
7
8
GND
SMBCLK
SMBDATA
DXN2
DXP2
DXN1
DXP1
V
CC
THER1
THER2VREF
THER3
DXN3
DXP3
MAX6698
ALERT
OVERT
R
EX2
R
THER2
R
EX1
R
THER1
Typical Application Circuit
19-3476; Rev 3; 8/07
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX6698EE_ _
-40°C to +125°C
16 QSOP
E16-1
MAX6698UE_ _
-40°C to +125°C
16 TSSOP
U16-1
SMBus is a trademark of Intel Corp.
Pin Configuration appears at end of data sheet.
*See the Slave Address section.
MAX6698
7-Channel Precision Remote-Diode, Thermistor,
and Local 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
, SCL, 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
THER_ to GND..........................................................-0.3V to +6V
VREF to GND............................................................-0.3V to +6V
SDA, ALERT, OVERT Current .............................-1mA to +50mA
DXN Current .......................................................................±1mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP
(derate 8.3mW/°C above +70°C) ......................666.7mW(E16-1)
16-Pin TSSOP
(derate 9.4mW/°C above +70°C)....................754.7mW(U16-1)
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
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
-2.5 +2.5
Local Temperature Accuracy V
CC
= 3.3V
T
A
= 0°C to +125°C
-3.5 +3.5
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 2.3
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
THERMISTOR CONVERSION
Voltage-Measurement Accuracy
-1 +1
%Full
scale
Conversion Time 31 ms
Thermistor Reference Voltage V
REF
1V
MAX6698
7-Channel Precision Remote-Diode, Thermistor,
and Local 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
UNITS
Reference-Load Regulation 0mA < I
REF
< 2mA 0.4 %
Reference-Supply Rejection 0.5 %/V
ALERT, OVERT
I
SINK
= 1mA 0.3
Output Low Voltage V
OL
I
SINK
= 6mA 0.5
V
Output Leakage Current 1µA
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/SDA 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.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

MAX6698EE38+

Mfr. #:
Buy MAX6698EE38+
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors 7-Ch Prec Therm Temp Monito
Lifecycle:
New from this manufacturer.
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