P82CF201 Datasheet | NXP Semiconductors

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 Rtherm C 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). - Constant temperature monitoring ensure reliable motor start-up at turn-on, ing 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 m A direct drive to LED indicators for fan power supply failure, fan failure, overheat warning, no fan connect - 500 m S 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 ponents - The watchdog timer performs self-check and reset function - On-chip oscillator allows operations with no external oscillator ponents - Supports low cost NTC thermistors (for PTC use P82CF202) - Hysteresis control (when THRESHOLD pin is connected to FEATURES Vss/Ground) for resistance between 10K (25 °C) and 15K (20 °C) during cooling to avoid unnecessary fan turning during cool...