Document
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 < TDIODE < 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
Antiparallel 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)
1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones
Datasheet
ORDER NUMBERS:
ORDERING NUMBER PACKAGE
FEATURES
EMC1428-1-AP EMC1428-6-AP
16 pin QFN (Lead-Free RoHS Compliant)
Up to 7 external diodes. “Hottest Of” temperature comparison. Hardware set Critical / Thermal shutdown, ALERT output
16 pin QFN (Lead-Free RoHS Compliant)
Up to 7 external diodes. “Hottest Of” temperature comparison. Hardware set Critical / Thermal shutdown, ALERT output
DIODE MODES SMBUS SUPPORTED ADDRESS
Intel CPU and 3904
1001_100(r/w)
Intel CPU and 3904
1001_101(r/w)
80 ARKAY DRIVE, HAUPPAUGE, NY 11788 (631) 435-6000, FAX (631) 273-3123
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