The Holtek HT32F67233 is high performance, low power consumption 32-bit microcontrollers 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 40 MHz for HT32F67233 with a Flash accelerator to obtain maximum efficiency. It provides up to 32 KB of embedded Flash memory for code/data storage and 4 KB of embedded SRAM memory for system operation and application program usage. A variety of peripherals, such as ADC, I2C, USART, UART, SPI, GPTM, SCTM, BFTM, WDT, SW-DP (Serial Wire Debug Port), etc., are also implemented in the device series. 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 RF module is a high performance and low cost OOK/GFSK transceiver for wireless applications in the 315 MHz, 433 MHz, 470 MHz, 868 MHz and 915 MHz frequency bands. It incorporates a highly integrated sub-1GHz transceiver and a baseband modem with programmable GFSK data rates from 2 Kbps to 250 Kbps and OOK data rates from 0.5 Kbps to 20 Kbps. Data handling features include 64-byte TX/RX FIFO and packet handling such as CRC generation, Forward Error Correction and data whitening, Manchester encoding.

The RF module is optimized for the very low power consumption applications. At 433 MHz band, its RX mode is operated at 5.9 mA and it delivers +19 dBm TX output power at 71 mA current consumption. A low-noise low-IF receiver can achieve -117 dBm sensitivity of 2 Kbps data rate at 433 MHz bands. A Class-E Power Amplifier can deliver up to +20 dBm output power at 433/868 MHz bands. A fully integrated Fractional-N synthesizer can support a wide frequency range with a fine resolution. Both loop filter and XO load capacitors are integrated to on-chip to minimize the requirement for external components.

External MCU can access the RF module through a 3-wire or 4-wire SPI interface. The device supports short strobe commands to reduce the loading of the MCU while maintaining wireless communication link.

Additional link layer features like RSSI for channel assessment, auto-acknowledgement and autoresend, WOT and WOR, etc., facilitate microcontroller based ISM bands wireless link applications. The above features ensure that the device is suitable for use in a wide range of applications, especially in areas such as industrial control (meter and data logging), smart home appliances (security products, sensor and alarm system), remote control (keyless entry), industrial/agricultural automation, data acquisition and recording and so on.

Features:

• max. frequency: 40MHz
• VDD: 2.0V~3.6V
• flash: 32KB
• SRAM: 4KB
• ADC: 1Msps, 12-bit×8
• timers: BFTM×1, SCTM×2, GPTM×1
• max. output power: 20dBm
• interface: USART×1, UART×1, SPI×1, I²C×1
• I/O: 21
• case: 46QFN