HT45F8750

General Information

The device is a Flash Memory BMS 8-bit high performance RISC architecture microcontroller with an integrated individual cell voltage monitor, designed for BMS 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 numbers, 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.

Analog features include a multi-channel 12-bit A/D converter and a comparator function. Multiple and extremely flexible Timer Modules provide timing, pulse generation and PWM output functions. Communication with the outside world is catered for by including fully integrated SPI, I²C, and UART interface functions, three popular interfaces which provide designers with a means of easy communication with external peripheral hardware. Protective features such as an internal Watchdog Timer, Low Voltage Reset and Low Voltage Detector coupled with excellent noise immunity and ESD protection ensure that reliable operation is maintained in hostile electrical environments.

A full choice of external and internal low and high oscillator functions are provided including fully integrated system oscillators which require no external components for their implementation. The ability to operate and switch dynamically between a range of operating modes using different clock sources gives users the ability to optimise microcontroller operation and minimise power consumption.

The device also has an individual cell voltage monitor module, a high accuracy voltage regulator, two discharge N-type MOSFET gate drivers and a charge N-type MOSFET gate driver, which is suitable for 3 to 8 rechargeable lithium batteries. The cell voltage monitor is designed to monitor each battery cell voltage individually and outputs the divide-by-2 voltage to the analog multiplexer with ±7.5mV accuracy when analog output is 2.1V. After being selected by an analog multiplexer, the output voltage is directly connected to the internal A/D converter for measurement. The integrated high accuracy VREFO is 2.5V (maximum drift ±15mV). The internal gate drivers can directly drive external power N-type MOSFETs to control charge and discharge. It also has functions of differential amplifier todetect charge/discharge current, hardware discharge short-current protection and overtemperature protection and so on. The integrated battery balance circuitry provides a cell balance current without the need of external transistors.

The inclusion of flexible I/O programming features, Time-Base functions along with many other features ensure that the device will find excellent use in applications such as handheld measurement instruments, electric power tools, handheld hair dryers, handheld vacuum cleaners in addition to many others.