P82CF201 datasheet(2/11 Pages) PHILIPS

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Philips Semiconductors

Product data

P82CF201

Low power, low price dual fan manager

2002 Nov 18

853–2393 29207

GENERAL DESCRIPTION

The P82CF201 is a 20-pin single-chip dual digital fan controller

designed for use with brushless DC fan motors. A thermistor (or

temperature resistive sensor) connected to the RthermC input

provides the required resistance of 10K to 1.75 K

Ω for 30% to 98%

PWM duty cycle.

With temperature less than 25

°C (thermistor resistance more than

10 K

Ω) and THRESHOLD is set to LOW, the fan will be off. When

temperature rises above 25

°C (NTC thermistor at 10K or less), the

PWM turns the fan on. The P82CF201 features a Turn-on Delay for

a second fan when both fans have to turn-on. This reduces the

in-rush current and suppresses acoustic noise.

The P82CF201 also features fan fault sensing for enhancing system

protection and reliability. It detects the presence of a fan, when the

running fan fails or jams using the voltage on VSENSE pin and

asserts the fault signal. The fault condition also triggers the

maximum PWM applied to the running fan. The fault is also asserted

when the thermistor resistance is less than 1.5 K

Ω (temperature is

over 76

°C).

FEATURES

• Temperature proportional fan speed control resulting in low

acoustic and longer fan life

• 3.0 V to 5.5 V operating range

• Dual PWM fan drive

• Constant temperature monitoring ensure reliable motor start-up at

turn-on, coming out of fault condition, or following a transient fault

• Constant fan sensing protect against fan failure and fault condition

• Over temperature and fan fail output pin

• 20 mA direct drive to LED indicators for fan power supply failure,

fan failure, overheat warning, no fan connect

• 500 mS turn-on delay for the second fan when both fans have to

turn-on, reducing high surge current and noise

• On-chip power-on reset allows operation with no external

components

• The watchdog timer performs self-check and reset function

• On-chip oscillator allows operations with no external oscillator

components

• Supports low cost NTC thermistors (for PTC use P82CF202)

• Hysteresis control (when THRESHOLD pin is connected to

Vss/Ground) for resistance between 10K (25

°C) and 15K (20 °C)

during cooling to avoid unnecessary fan turning during cool down

• Constant cooling (when THRESHOLD pin is not connected or tied

to VDD) for resistance above 10K

• Maximum PWM is asserted when one fan fails, cooling the system

during fan failure

• 20-pin TSSOP package.

ORDERING INFORMATION

Type number

Package

Name

Description

Thermistor Range

Version

P82CF201BDH

TSSOP20

plastic thin shrink small outline package; 20 leads; body width 4.4 mm

NTC – 1.7 to 32 K

Ω

SOT360-1

PIN CONFIGURATION, 20-PIN TSSOP PACKAGES

SU01716

FAN1DRIVE

VSENSE1

FAN2DRIVE

VSS

VSENSE2

FAULT

THRESHOLD

RthermC

RrefC

VDD

RthermC DRIVE

RrefC DRIVE

P82CF201

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