P82CF201 반도체 회로 부품 판매점
Low power / low price dual fan manager
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 NXP Semiconductors |
INTEGRATED CIRCUITS
P82CF201
Low power, low price dual fan manager
Product data
Supersedes data of 2002 Nov 04
2002 Nov 18
Philips
Semiconductors
Philips Semiconductors
Low power, low price dual fan manager
Product data
P82CF201
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 KΩ for 30% to 98%
PWM duty cycle.
With temperature less than 25 °C (thermistor resistance more than
10 KΩ) 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 KΩ (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
P82CF201BDH TSSOP20 plastic thin shrink small outline package; 20 leads; body width 4.4 mm
Thermistor Range
NTC – 1.7 to 32 KΩ
Version
SOT360-1
PIN CONFIGURATION, 20-PIN TSSOP PACKAGES
FAN1DRIVE 1
VSENSE1 2
FAN2DRIVE 3
NC 4
VSS 5
VSENSE2 6
FAULT 7
NC 8
NC 9
NC 10
20 NC
19 THRESHOLD
P82CF201
18 RthermC
17 RrefC
16 NC
15 VDD
14 NC
13 NC
12 RthermC DRIVE
11 RrefC DRIVE
SU01716
2002 Nov 18
2 853–2393 29207
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P82CF201 data
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