HT32F61741

32-Bit Arm® Cortex®-M0+ BMS MCU

General Information

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.

Feature Details

Core
  • 32-bit Arm® Cortex®-M0+ processor core
  • Up to 20 MHz operating frequency
  • Single-cycle multiplication
  • Integrated Nested Vectored Interrupt Controller (NVIC)
  • 24-bit SysTick timer
On-chip Memory
  • Up to 64 KB on-chip Flash memory for instruction/data and option bytes storage
  • Up to 8 KB on-chip SRAM
  • Supports multiple boot modes
Flash Memory Controller – FMC
  • 32-bit word programming with In System Programming (ISP) and In Application Programming (IAP)
  • Flash protection capability to prevent illegal access

Reset Control Unit – RSTCU

Supply supervisor
  • - Power on Reset / Power down Reset – POR / PDR
  • - Brown-out Detector – BOD
  • - Programmable Low Voltage Detector – LVD

Feature Details

Clock Control Unit – CKCU
  • External 4 to 20 MHz crystal oscillator
  • External 32.768 kHz crystal oscillator
  • Internal 20 MHz RC oscillator trimmed to ±2 % accuracy at 25 °C operating temperature
  • Internal 32 kHz RC oscillator
  • Independent clock divider and gating bits for peripheral clock sources

Power Management Control Unit – PWRCU

Flexible power supply

VDD power supply (2.5 V ~ 5.5 V), VDDIO for I/Os (1.8 V ~ 5.5 V)

Integrated 1.5 V LDO regulator for MCU core, peripherals and memories power supplyAvailable
VDD, VDDIO and VCORE power domainsAvailable
Three power saving modes

Sleep, Deep-Sleep1, Deep-Sleep2

Feature Details

Real Time Clock – RTC
  • 24-bit up-counter with a programmable prescaler
  • Alarm function
  • Interrupt and Wake-up event
External Interrupt / Event Controller – EXTI
  • Up to 16 EXTI lines with configurable trigger source and type
  • All GPIO pins can be selected as EXTI trigger source
  • Source trigger type includes high level, low level, negative edge, positive edge or both edges
  • Individual interrupt enable, wakeup enable and status bits for each EXTI line
  • Software interrupt trigger mode for each EXTI line
  • Integrated deglitch filter for short pulse blocking
Hardware Divider – DIV
  • Signed/unsigned 32-bit divider
  • Operation in 8 clock cycles, load in 1 clock cycle
  • Divide by zero error Flag
Analog to Digital Converter – ADC
  • 12-bit SAR ADC engine
  • Up to 1 Msps conversion rate
  • Up to 7 external analog input channels
I/O Ports – GPIO
  • Up to 23 GPIOs
  • Port A, B, C are mapped to 16-line EXTI interrupts
  • Almost all I/O pins have configurable output driving curren
Basic Function Timer – BFTM
  • 32-bit compare match count-up counter – no I/O control
  • One shot mode – counter stops counting when compare match occurs
  • Repetitive mode – counter restarts when compare match occurs
Motor Control Timer – MCTM
  • 16-bit up, down, up/down auto-reload counter
  • Up to 4 independent channels
  • 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
  • Input Capture function
  • Compare Match Output
  • PWM waveform generation with Edge-aligned and Center-aligned Counting
  • Single Pulse Mode Output
  • Complementary Outputs with programmable dead-time insertion
  • Break input to force the timer’s output signals into a reset or fixed condition
General-Purpose Timer – GPTM
  • 16-bit up, down, up/down auto-reload counter
  • Up to 4 independent channels
  • 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
  • Input Capture function
  • Compare Match Output
  • PWM waveform generation with Edge-aligned and Center-aligned Counting
  • Single Pulse Mode Output
  • Encoder interface controller with two inputs using quadrature decoder
Pulse-Width-Modulation Timer – PWM
  • 16-bit up, down, up/down auto-reload counter
  • Up to 4 independent channels for each timer
  • 16-bit programmable prescaler that allows division of the prescaler clock source by any factor between 1 and 65536 to generate the counter clock frequency
  • Compare Match Output
  • PWM waveform generation with Edge-aligned and Center-aligned Counting
  • Single Pulse Mode Output
Watchdog Timer – WDT
  • 12-bit down counter with 3-bit prescaler
  • Provides reset to the system
  • Programmable watchdog timer window function
  • Register write protection function
Inter-integrated Circuit – I2C
  • Supports both master and slave modes with a frequency of up to 1 MHz
  • Provides an arbitration function and clock synchronization
  • Supports 7-bit and 10-bit addressing modes and general call addressing
  • Supports slave multi-addressing mode with address mask function

Serial Peripheral Interface – SPI

Supports both master and slave modesAvailable
Frequency of up to (fPCLK/2) MHz for the master mode and (fPCLK/3) MHz for the slave modeAvailable
FIFO Depth

8 levels

Multi-master and multi-slave operationAvailable

Universal Synchronous Asynchronous Receiver Transmitter – USART

Supports both asynchronous and clocked synchronous serial communication modesAvailable
Programmable baud rate clock frequency up to (fPCLK/16) MHz for Asynchronous mode and (fPCLK/8) MHz for synchronous modeAvailable
Full duplex communicationAvailable
Fully programmable serial communication characteristics including
  • - Word length: 7, 8 or 9-bit character
  • - Parity: Even, odd or no-parity bit generation and detection
  • - Stop bit: 1 or 2 stop bits generation
  • - Bit order: LSB-first or MSB-first transfer
Error detection

Parity, overrun and frame error

Auto hardware flow control mode – RTS, CTSAvailable
IrDA SIR encoder and decoderAvailable
RS485 mode with output enable controlAvailable
FIFO Depth

8-level for both receiver and transmitter

Universal Asynchronous Receiver Transmitter – UART

Asynchronous serial communication operating baud-rate clock frequency up to (fPCLK/16) MHzAvailable
Full duplex communicationAvailable
Fully programmable serial communication characteristics including:
  • - Word length: 7, 8 or 9-bit character
  • - Parity: Even, odd or no-parity bit generation and detection
  • - Stop bit: 1 or 2 stop bits generation
  • - Bit order: LSB-first or MSB-first transfer
Error detection

Parity, overrun and frame error

Cyclic Redundancy Check – CRC

Supports CRC16 polynomial

0x8005, X16+X15+X2+1

Supports CCITT CRC16 polynomial

0x1021, X16+X12+X5+1

Supports IEEE-802.3 CRC32 polynomial

0x04C11DB7, X32+X26+X23+X22+X16+X12+X11+X10+X8+X7+X5+X4+X2+X+1

Supports 1's complement, byte reverse & bit reverse operation on data and checksumAvailable
Supports byte, half-word & word data sizeAvailable
Programmable CRC initial seed valueAvailable
CRC computation executed in 1 AHB clock cycle for 8-bit data and 4 AHB clock cycles for 32-bit dataAvailable

Individual Cell Voltage Monitor

Integrated voltage regulator with 5 V / 50 mA and ±1 % accuracyAvailable
Individual cell voltage monitor outputs 1/2 of battery cell voltage, when the analog output is 2.1 V, it has an accuracy of ±7.5 mVAvailable
At TA = -40 ℃ ~ 85 ℃, 2.5 V reference voltage output with a maximum variation of 15 mV in temperature driftAvailable
Internal cell balance switchesAvailable
Two Discharge N-type MOSFET gate driversAvailable
Single Charge N-type MOSFET gate driverAvailable
Charge/Discharge differential OPA current monitor
  • - IMON outputs amplified ISP-ISN differential voltage
  • - Voltage amplifying rate selection: 10/50
Discharge short-current detection
  • - Detection threshold voltage selection: 50 mV / 100 mV / 150 mV / 200 mV / 250 mV / 300 mV / 350 mV / 400 mV
  • - Detection debounce time selection: 0 μs ~ 99 2μs, 32 sections, 32 μs per section
Integrated Over-temperature protection selection

85 ℃ / 100 ℃ / 125 ℃ / 150 ℃

Sleep mode with 0.1 μA ultra-low standby currentAvailable
Two High-voltage wake-up functionsAvailable

Feature Details

Debug Support
  • Serial Wire Debug Port – SW-DP
  • 4 comparators for hardware breakpoint or code / literal patch
  • 2 comparators for hardware watch points

Package and Operation Temperature

64-pin LQFP packageAvailable
Operation temperature range

-40 °C to 85 °C

Resources

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