The Holtek HT32F61741 device is a high performance, low power consumption 32-bit microcontroller based around an Arm® Cortex®-M0+ processor core. The Cortex®-M0+ is a next-generation processor core which is tightly coupled with Nested Vectored Interrupt Controller (NVIC), SysTick timer, and including advanced debug support.

The device operates at a frequency of up to 20 MHz. It provides 64 KB of embedded Flash memory for code/data storage and 8 KB of embedded SRAM memory for system operation and application program usage. A variety of peripherals, such as Hardware Divider DIV, ADC, I2C, USART, UART, SPI, MCTM, GPTM, PWM, BFTM, CRC-16/32, RTC, WDT, SW-DP (Serial Wire Debug Port), etc., are also implemented in the device. Several power saving modes provide the flexibility for maximum optimization between wakeup latency and power consumption, an especially important consideration in low power applications.

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 ±7.5 mV accuracy when analog output is 2.1 V. 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 2.5 V (maximum drift ±15 mV). The internal gate drivers can directly drive external power N-type MOSFETs to control charge and discharge. It also has functions of differential amplifier to detect charge/discharge current, hardware discharge shortcurrent protection and overtemperature protection and so on. The integrated battery balance circuitry provides a cell balance current without the need of external transistors.

The above features ensure that the device is suitable for use in a wide range of applications, especially in areas such as handheld measurement instruments, electric power tools, handheld hair dryers, handheld vacuum cleaners in addition to many others.

Specification:

• max. frequency: 20MHz
• VDD: 2.5V~5.5V
• flash: 64KB
• SRAM: 8KB
• I/O: 23
• timer: BFTM×2, PWM×2, GPTM×1, MCTM×1
• ADC: 1Msps, 12-bit×7
• interface: USART×1, UART×1, SPI×2, I²C×2
• case: 64LQFP-EP