EMC2101-R-ACZL-TR datasheet(10/55 Pages) SMSC

10 / 55 page

SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

Revision 2.53 (03-13-07)

SMSC EMC2101

DATASHEET

Supply Current

IDD

300

1 conversion / 16 seconds - DAC

Driver, no load

Supply Current

IDD

300

TBD

Temp monitoring Disabled, DAC

Driver enabled, no load

Standby Current

ISTANDBY

180

μA

PWM disabled, Monitoring

disabled

Internal Temperature Monitor

Temperature Accuracy

±1

±2

°C

Temperature

Resolution

±1

°C

8 bit resolution

Conversion Time

Internal Channel

tCONV

3ms

External Temperature Monitor

Temperature Accuracy

±0.5

±1

°C

60°C < TDIODE < 100°C,

10°C < TA < 70°C

±1

±3

°C

0°C < TDIODE < 125°C

Temperature

Resolution

0.125

°C

11 bit resolution

Conversion Time

External Channel

tCONV

Diode Decoupling

Capacitor

CFILTER

2.2

Connected across External Diode

(2N3904)

Diode Decoupling

Capacitor

CFILTER

470

Connected across Substrate

Transistor (CPU diode)

Resistance Error

Correction

RSERIES

100

Series resistance in DP and DN

lines

TACH Measurement

TACH Accuracy

TACH valid

Fan Counter Clock

Frequency

kHz

Pulse Width Modulator Fan Driver

PWM Resolution

steps

PWM Frequency

fPWM

For 64 steps, higher frequencies

are possible with reduced

resolution. See Section 6.34.

PWM Duty cycle

DPWM

100

DAC Fan Driver

Output Voltage Drive

VDAC

0.2

VDD - 0.2

Current Load = ±1mA

Table 3.2 Electrical Specifications (continued)

VDD = 3.0V to 3.6V, TA = 0

oC - 85oC, Typical values are at T

A = 27°C unless otherwise noted

CHARACTERISTIC

SYMBOL

MIN

TYP

MAX

UNIT

CONDITIONS

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