They also include a new short-circuit current protection function and a differential OPA that can improve the charge/discharge current detection accuracy, permitting the power control MOS to be rapidly shut down. The devices are suitable for 3 to 8 cell Li-battery products, such as BMS boards, power tools, cordless hair dryers, cordless vacuum cleaners and so on.

With regards to memory the devices contain a 32KB/64KB Flash Program Memory and 2KB/8KB SRAM Data Memory. The devices have a high operating speed of 16MHz/20MHz and include 23 multifunctional I/O pins which can be are used by an abundant range of internal functions such as UART, SPI and I²C interfaces.

The devices contain up to 15 channels of 16-bit PWM functions and an SAR A/D converter which has 7 external channels and a conversion speed of up to 1Msps. The devices contain two integrated low-side high voltage gate-driver circuits and single integrated high-side high voltage gate-driver circuit are used to drive MOSFET transistors.

The devices have an integrated zero standby power consumption function and two high voltage wake-up functions offering an overall power-down current as low as 0.1μA which will greatly increase the battery standby time. When the charger is connected or if a key is pressed, the MCU will be woken up.

Together with the integrated passive balance circuitry and over temperature protection, all of these features combine to greatly reduce the number of external component requirements, which results in reduced PCB areas. Regarding packaging, the devices are supplied in a 64-pin LQFP-EP package type.

Holtek’s HT32 series of MCUs are supported by multiple development environments which includes Keil, IAR, SEGGER as well as GNU. The device series is also supported by additional comprehensive development resources such as hardware development kits, peripheral driver firmware libraries and application examples. The full M0+ MCU series has been licensed for use by Keil MDK-ARM.

By using the ISP (In-System Programming) and IAP (In-Application Programming) technologies, the firmware can be easily and rapidly upgraded. The full HT32 series has passed the UL/IEC 60730-1 Class B certification and can provide self-test programs which are contained in a Safety Test Library in order to reduce product certification cycle times.