EMC1428 Datasheet, PDF (1/47 Pages) SMSC Corporation – 1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones

EMC1428
1°C Multiple Temperature
Sensor with HW Thermal
Shutdown & Hottest of
Thermal Zones
PRODUCT FEATURES
Datasheet
General Description
The EMC1428 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 EMC1428 provides a hardware
programmable system shutdown feature that is
programmed at part power-up via a single TRIP_SET
voltage channel that cannot be masked or corrupted
through the SMBus.
Each device provides ±1° accuracy for external diode
temperatures and ±2°C accuracy for the internal diode
temperature. The EMC1428 monitors up to eight
temperature channels (up to seven external and one
internal).
Applications
„ Notebook Computers
„ Desktop Computers
„ Industrial
„ Embedded Applications
Features
„ Hardware Thermal Shutdown
— triggers dedicated SYS_SHDN pin
— hardware configured range 65°C to 127°C in 1°C steps
— cannot be disabled or modified by software
„ 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 (60°C < T_DIODE < 100°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
— ±2°C accuracy
„ 3.3V Supply Voltage
„ Available in a 16 pin 4mm x 4mm QFN lead-free
RoHS Compliant package
„ Programmable temperature limits for ALERT
Block Diagram
TRIP_SET
SYS_SHDN
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
Critical / Thermal
Shutdown Logic
11 bit Σ Δ
ADC
Voltage to Temp
conversion
Voltage Register
Temp Registers
Hottest of Comparison
SMBus
Slave
Protocol
SMCLK
SMDATA
ALERT
SMSC EMC1428
DATASHEET
Revision 0.62 (03-05-08)