AMC6821 datasheet(3/54 Pages) TI

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ELECTRICAL CHARACTERISTICS

AMC6821

SBAS386C – MAY 2006 – REVISED JULY 2007

At TA = –40°C to +100°C and VDD = +3V or +5V, unless otherwise noted.

AMC6821

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

TEMPERATURE MEASUREMENT

TA = 0°C to +90°C

±0.5

±2.0

°C

Local sensor accuracy

TA = –25°C to +100°C

±1.0

±3.0

°C

TR = +50°C to +100°C

±0.5

±2.0

°C

Remote sensor accuracy(1)

TR = –40°C to +125°C

±1.0

±3.0

°C

Sensor resolution

Both channels

0.125

°C

Conversion time

Two channels

62.5

PWM CONTROLLER

PWM frequency range (programmable)

40k

PWM frequency accuracy

+25

°C to +100°C

–6

Duty cycle

Programmable

100

Duty cycle resolution

8-bit

0.39

%/bit

FAN RPM-TO-DIGITAL CONVERTER

Accuracy

+25

°C to +100°C

–6

Full-scale count

65535

Nominal input RPM

100

23000

RPM

Internal clock frequency for RPM measurement

100

kHz

DIGITAL INPUT/OUTPUT

VOL

Open-drain output low voltage

Sink current 6 mA, VDD = +3V

0.4

IOH

Open-drain high-level output leakage current

0.1

µA

VIH

Input high voltage

2.1

VIL

Input low voltage

0.8

IIH

Input high current

–1

µA

IIL

Input low current

µA

Input capacitance

POWER SUPPLY

Operating VDD Range

2.7

5.5

Specified VDD Range

Current

VDD = 5

1.1

2.0

Power dissipation

Operating temperature

–40

+125

°C

Storage temperature

–65

+150

°C

(1)

The remote temperature sensor is optimized for the Pentium M™ thermal diode with diode ideality n = 1.0022, and TA = 0°C to +100°C.

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