EMC2102 datasheet(13/52 Pages) SMSC

13 / 52 page

RPM-Based Fan Controller with HW Thermal Shutdown

Datasheet

SMSC EMC2102

Revision 1.95 (10-19-06)

DATASHEET

Note 3.4

TDIE refers to the internal die temperature and may not match TA due to self heating of

the device. The internal temperature sensor will return TDIE.

Note 3.5

Contact SMSC for Application Notes and guidelines when measuring GPU processor

diodes and CPU processor diodes.

3.3

SMBus Electrical Specifications

RPM Based Fan Controller

TACH Range

TACH

480

16000

RPM

TACH Setting

Accuracy

TACH

±1

±2

External oscillator 32.768kHz

TACH

±5

±7.5

Internal Oscillator

40°C < TDIE < 100°C

Thermal Shutdown

Threshold

TSDTH

150

°C

Thermal Shutdown

Hysteresis

TSDHYST

°C

SMBus and Digital I/O pins

Output High Voltage

VOH

VDD

_3V 0.4

2 mA current drive

Output Low Voltage

VOL

0.5

4mA current sink

Table 3.3 SMBus Electrical Specifications

VDD_3V = 3V to 3.6V, VDD_5V = 4.6 to 5.5V, TA = 0°C to 85°C

Typical values are at TA = 27°C unless otherwise noted.

CHARACTERISTIC

SYMBOL

MIN

TYP

MAX

UNITS

CONDITIONS

SMBus Interface

Input High Voltage

VIH

2.0

Input Low Voltage

VIL

0.8

Input High/Low Current

IIH / IIL

-1

Input Capacitance

CIN

5pF

Output Low Sink Current

SMDATA = 0.5V

SMBus Timing

Clock Frequency

fSMB

400

kHz

Spike Suppression

tSP

Table 3.2 Electrical Specifications (continued)

VDD_3V = 3V to 3.6V, VDD_5V = 4.6V - 5.5V, TA = 0°C to 85°C

all Typical values at TA = 27°C unless otherwise noted.

CHARACTERISTIC

SYMBOL

MIN

TYP

MAX

UNIT

CONDITIONS

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