Date: 18/06/2012

Flash type motor controller MCU from Holtek

Holtek has announced a new Flash type fan controller, the HT45FM2C. The device is suitable for three phase brushless DC motor fan applications.

Features:
1. 4Kx15 of Flash program memory
2. 256 bytes of RAM data memory
3. 128 bytes of data EEPROM
4. Operating voltage range: 4.5~5.5V
5. Operating frequency of up to 20MHz
6. Includes an internal RC oscillator and a 9 channel 10-bit analog to digital converter
7. 28-pin SOP, 28-pin SSOP and 44-pin QFP package types


An 8-bitx2 remote timer can be used to decode IR signals as well as a PWM speed control interface. These functions are complemented by four 10-bit and one 16-bit CTM timers.

The HT45FM2C device supports the most common six-step control in Hall sensor and sensor-less solutions. The device provides six external interrupt pins, among which three of them are used to sense the transmitted rotational signals from external Hall Effect Sensors, reducing the software loading on rotation positional sensing. Other features include three pairs of 10-bit PWM complimentary outputs complete with a Dead Time function, Polarity IO polarity adjustment and integrated Hall Sensor decoder for convenient control of three phase brushless DC motors. The device has a fully integrated operational amplifier, a comparator and a DAC circuit which can be used to amplify the DC motor current detect signal.

The HT45FM2C meets industrial specifications.