The BD66FM8452F is a Flash Memory 8-bit high performance RISC architecture microcontroller, which includes three groups of half-bridge driver circuits for driving brushless DC motor directly and a host of fully integrated special features specifically designed for brushless DC motor applications.

For memory features, the Flash Memory offers users the convenience of multi-programming features. Other memory includes an area of RAM Data Memory as well as an area of true EEPROM memory for storage of non-volatile data such as serial number, calibration data, etc. By using the In Application Programming technology, users have a convenient means to directly store their measured data in the Flash Program Memory as well as having the ability to easily update their application programs.

In addition to the advantages of low power consumption and I/O flexibility, the device also includes multiple and extremely flexibile Timer Modules, internal oscillators, multi-channel A/D converter, D/A converter, Operational Amplifier, Pulse Width Modulation function, 16-bit Capture Timer Module function, Comparators, Motor Protection Module, Hall sensor position detection function, I²C and UART interface function, a 16-bit MDU, Time Base function, 5V LDO, Low Voltage Reset, Low Voltage Detection, power-down and wake-up functions. Especially designed for brushless DC motor applications, the enhanced versatility of this device makes it applicable for use in a wide range of electrical tools application possibilities such as floor fans, pumps, etc.

CPU Features

• operating voltage
  • fSYS =32kHz ~ 20MHz: 4.5V~5.5V
  • VM =6V~32V
• up to 0.2μs instruction cycle with 20MHz system clock at VDD =5V
• power down and wake-up functions to reduce power consumption
• oscillator types
  • internal high speed 20MHz RC – HIRC
  • internal low speed 32kHz RC – LIRC
• internal oscillators require no external components
• multi-mode operation: FAST, SLOW, IDLE and SLEEP
• all instructions executed in 1~3 instruction cycles
• table read instructions
• 115 powerful instructions
• 8-level subroutine nesting
• bit manipulation instruction

Peripheral Features

• flash program memory: 8K×16
• RAM data memory: 2048×8
• true EEPROM memory: 512×8
• in application programming function – IAP
• Watchdog Timer function
• 13 bidirectional I/O lines
• five pin-shared external interrupt inputs – H1, H2, H3, NFIN and INT
• multiple timer modules for time measurement, input capture, compare match output, PWM output or single pulse output function
• single 16-bit Capture Timer Module for motor protection
• single 10-bit PWM generator provides 3 groups of PWM outputs, supporting edge/center aligned mode
• 9 external channel 12-bit resolution A/D converter with Programmable Internal Reference Voltage VVR
• up to four comparators
• I²C interface
• single fully-duplex or half-duplex universal asynchronous receiver and transmitter interfaces– UART
• integrated multiplier/divider unit – MDU
• integrated 16-bit cyclic redundancy check function – CRC
• single time base function for generation of fixed time interrupt signal
• integrated 50mA LDO with 5.0V±1.5% accuracy
• low voltage reset function
• low voltage detect function
• protection features
  • VCC under voltage lock-out (UVLO)
  • output short-circuit protection (OSP)
  • over temperature protection (OTP)
  • over current detection which contains operational amplifier, comparator 0 and 8-bit D/A converter
• package type: 32-pin QFN