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P82CF201 Datasheet(PDF) 2 Page - NXP Semiconductors |
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P82CF201 Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 11 page Philips Semiconductors Product data P82CF201 Low power, low price dual fan manager 2 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 1 2 3 4 5 6 7 8 9 11 12 13 14 15 16 17 18 19 20 FAN1DRIVE VSENSE1 FAN2DRIVE NC VSS VSENSE2 FAULT NC NC NC NC THRESHOLD RthermC RrefC NC VDD NC RthermC DRIVE NC RrefC DRIVE 10 P82CF201 |
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