CST92P12 – Bluetooth 5.0 Dual-Core Low Power SoC with RISC + 8051 MCU Architecture

he CST92P12 is a highly integrated, low-power Bluetooth SoC based on the Bluetooth 5.0 protocol stack. It features a dual-core architecture with a 32-bit RISC MCU dedicated to Bluetooth protocol processing and an enhanced 8-bit 8051 MCU optimized for user applications, providing high flexibility and efficient performance for various Bluetooth-based smart applications.

The chip supports ultra-low power operation with sleep mode consumption as low as 620nA, making it ideal for battery-powered devices such as Bluetooth scales, iBeacons, HID peripherals, smart lighting, and wireless toys. It integrates a single-ended 2.4GHz RF transceiver supporting GFSK modulation and 1Mbps data rate, with a TX power range from -5dBm to +5dBm and -93dBm receive sensitivity.

On-chip memory includes 80KB ROM, 12KB SRAM, 2KB OTP, and patchable RAM for both MCUs. It also integrates multiple peripherals, such as UART, I2C, SPI, PWM, ADC, and GPIOs. Program loading can be done via I2C/SPI memory or through UART by an external MCU (excluding 8051 core).

🔧 Key Features:

• Fully integrated Bluetooth 5.0 protocol stack

• Dual-core: 32-bit RISC MCU + 8-bit enhanced 8051 MCU

• Ultra-low power consumption:

  • Connection: 62μA @ 300ms interval

  • Advertising: 60μA @ 1s interval

  • Sleep mode: 620nA (32kHz RC OSC)

  • TX: 18mA, RX: 17mA

• RF transceiver:

  • GFSK modulation, 1Mbps data rate

  • TX power: -5 to +5 dBm

  • RX sensitivity: -93 dBm

• Memory:

  • 80KB ROM, 8KB patch RAM (RISC MCU)

  • 16KB instruction RAM, 256B IRAM (8051 MCU)

  • 12KB SRAM, 2KB OTP

• I/O and Peripherals:

  • 10 GPIOs, 2 timers, 2 PWM, 1 UART, 1 I2C, 1 SPI, 10-bit ADC

• Program loading via I2C EEPROM, SPI Flash, or UART (RISC only)

• Voltage range: VIN/VIO 1.8V–3.6V

• SSOP24L package

📌 Typical Applications:

• Bluetooth digital scales and BP monitors

• Bluetooth iBeacon and proximity solutions

• Wireless UART data transmission

• LED lighting control via Bluetooth

• Bluetooth keyboards, mice, and remote controls

• Smart locks and Bluetooth-enabled toys