ADT7461A Datasheet, PDF (1/24 Pages) Analog Devices – ±1°C Temperature Monitor with Series Resistance Cancellation

±1°C Temperature Monitor with Series
Resistance Cancellation
ADT7461A
FEATURES
On-chip and remote temperature sensor
0.25°C resolution/1°C accuracy on remote channel
1°C resolution/1°C accuracy on local channel
Automatically cancels up to 1.5 kΩ (typical) of resistance in
series with remote diode to allow noise filtering
Extended, switchable temperature measurement range
0°C to +127°C (default) or –64°C to +191°C
Pin- and register-compatible with ADM1032 and ADT7461
2-wire SMBus serial interface with SMBus alert support
Programmable over/under temperature limits
Offset registers for system calibration
Up to two overtemperature fail-safe THERM outputs
Small 8-lead MSOP
240 μA operating current, 5 μA standby current
APPLICATIONS
Desktop and notebook computers
Industrial controllers
Smart batteries
Automotive
Embedded systems
Burn-in applications
Instrumentation
FUNCTIONAL BLOCK DIAGRAM
ON-CHIP
TEMPERATURE
SENSOR
CONVERSION RATE
REGISTER
LOCAL TEMPERATURE
VALUE REGISTER
D+ 2
D– 3
ANALOG
MUX
A-TO-D
CONVERTER
BUSY RUN/STANDBY
REMOTE TEMPERATURE
VALUE REGISTER
REMOTE OFFSET
REGISTER
EXTERNAL DIODE OPEN-CIRCUIT
ADT7461A
1
V_DD
5
GND
STATUS REGISTER
ADDRESS POINTER
REGISTER
LOCAL TEMPERATURE
LOW-LIMIT REGISTER
LOCAL TEMPERATURE
HIGH-LIMIT REGISTER
REMOTE TEMPERATURE
LOW-LIMIT REGISTER
REMOTE TEMPERATURE
HIGH-LIMIT REGISTER
LOCAL THERM LIMIT
REGISTERS
EXTERNAL THERM LIMIT
REGISTERS
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
SMBus INTERFACE
7
SDATA
8
SCLK
Figure 1.
6 _ALERT/THERM2
4 THERM
Rev. A
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