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SMSC - Multiple Temperature Sensor

Numéro de référence EMC1438
Description Multiple Temperature Sensor
Fabricant SMSC 
Logo SMSC 





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EMC1438 fiche technique
EMC1438
1°C Multiple Temperature Sensor
with Hardware Controlled Standby &
Hottest of Multiple Zones
PRODUCT FEATURES
Datasheet
General Description
The EMC1438 is a high accuracy, low cost, System
Management Bus (SMBus) temperature sensor.
Advanced features such as Resistance Error Correction
(REC), Beta Compensation (to CPU diodes requiring the
BJT or transistor model) and automatic diode type
detection combine to provide a robust solution for
complex environmental monitoring applications.
Additionally, the hardware controlled STANDBY pin
allows for system level power shutdown to support
energy saving initiatives.
The EMC1438 monitors up to eight temperature
channels (up to seven external and one internal). The
device provides ±1°C accuracy for the internal and
external diode temperatures.
Temperature monitoring includes two tiers of protection:
one that can be masked and causes the ALERT pin to
be asserted, and the other that cannot be masked and
causes the THERM pin to be asserted.
Applications
„ Notebook Computers
„ Desktop Computers
„ Industrial
„ Embedded Applications
Features
„ Hardware Set Standby Mode
— 200uA (typical) quiescent current in Standby
„ Designed to support 45nm, 65nm, and 90nm CPU
diodes
„ Supports diodes requiring the BJT or transistor model
„ Resistance Error Correction (up to 100 Ohms)
„ Up to seven External Temperature Monitors
— ±1°C Accuracy (40°C < TDIODE < 110°C)
— 0.125°C Resolution
— Supports up to 2.2nF filter capacitor
— Anti-parallel diodes for extra diode support and
compact design
„ Internal Temperature Monitor
— ±1°C Accuracy
— 0.125°C Resolution
„ Programmable temperature limits for ALERT and
THERM
„ 3.3V Supply Voltage
„ SMBus 2.0 interface
— Pin-selectable SMBus address
— Block Read and Write
„ Available in a 16-pin 4mm x 4mm QFN Lead-free
RoHS Compliant package
Block Diagram
DP1
DN1
DP2 / DN3
DN2 / DP3
DP4 / DN5
DN4 / DP5
DP6 / DN7
DN6 / DP7
External
Temp
Diode
Inputs
Anti-
parallel
Diode
Analog
Mux
Internal
Temp
Diode
11 bit Σ Δ
ADC
Voltage to Temp
Conversion
Voltage Register
Temp Registers
Hottest of
Comparison
SMBus
Slave
Protocol
ADDR_SEL
SMCLK
SMDATA
ALERT
THERM
STANDBY
SMSC EMC1438
DATASHEET
Revision 1.0 (04-29-10)

PagesPages 30
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