Bluetooth Low Energy SOC

General Description

The RTL8762AG/RTL8762AR/RTL8762AJ/RTL8762AK (hereafter referred to as the RTL8762A) are ultra-low-power system on-chip solutions for Bluetooth low energy applications that combines the excellent performance of a leading RF transceiver with a low-power ARM®Cortex™-M0, 256KB eFlash, 80KB RAM, and rich powerful supporting features and peripherals.

The embedded ARM®Cortex™-M0 32-bit CPU features a 16-bit instruction set with 32-bit extensions (Thumb-2® technology) that delivers high-density code with a small memory footprint. By using a single-cycle 32-bit multiplier, a 3-stage pipeline, and a Nested Vector Interrupt Controller (NVIC), the ARM®Cortex™-M0 CPU makes program execution simple and highly efficient.

In the RTL8762A, we support the Serial Wire Debug (SWD) interface provided as part of the Debug Access Port (DAP), in conjunction with the Basic Branch Buffer (BBB). This offers a flexible and powerful mechanism for non-intrusive program code debugging. Users can easily add breakpoints in the code and perform single-step debugging.

The RTL8762A memory architecture includes 80KB of data RAM that can be divided into three portions, e.g., 16KB for buffer RAM, 24KB for on-RAM, and 40KB for off-RAM. Specifically, the available memory for APPs includes 9KB in on-RAM and 18KB in off-RAM. Each on-RAM and off-RAM can be divided into static and dynamic areas. The area size can be adjusted via eFUSE.

The on-RAM can maintain data when the system is in Deep Low Power State (DLPS) mode (Data in off-RAM is lost when the system enters DLPS mode). The static area refers to the global variables in the program. The dynamic area refers to the direct or indirect call of the OS’s pvPortMalloc allocated space, such as xQueueCreate, xTaskCreate, etc.

The RTL8762A also integrates a sigma-delta ADC, programmable gain amplifier, and microphone bias circuit for voice command application. The RTL8762A embeds IR transceiver, hardware keyscan, and Quad-decoder on a single IC, and is provided in a QFN package.

Package and pin differences between the AG/AR/AJ/AK versions are described in this document where they arise.



  • Ultra low power consumption with intelligent PMU
  • Supports Bluetooth 4.2 core specification
  • Integrated MCU to execute Bluetooth protocol stack
  • Supports multiple level Low Energy states
  • Supports LE L2CAP Connection Oriented Channel Support
  • Supports LE low duty directed advertising
  • Supports LE data length extension feature
  • Supports OTA (Over-the-Air) programming mechanism for firmware upgrade
  • Supports external 32KHz XTAL for low power mode
  • Supports GAP, ATT/GATT, SMP, L2CAP
  • Generic Applications for GAP Central, Peripheral, Observer and Broadcaster Roles


  • ARM® Cortex™-M0 (Maximum 53MHz)
  • 256KB embedded flash
  • 80KB RAM
  • 2KB eFUSE
  • Supports AES128/192/256 encrypt/decrypt engine

Bluetooth Transceiver

  • Fast AGC control to improve receiving dynamic range
  • Supports Bluetooth Low Energy PHY

Peripheral Interfaces

  • Flexible General Purpose IOs
    • RTL8762AR: 15 GPIOs
    • RTL8762AG: 16 GPIOs
    • RTL8762AJ: 23 GPIOs
    • RTL8762AK: 37 GPIOs
  • Three configurable LED pins
  • Hardware Keyscan and Quad-decoder
  • Embedded IR transceiver
  • Real-Time Counters (RTC)
  • Supports generic 4-wire SPI master/slave
  • Supports Low power comparator
  • Timers x 8
  • I2C x 2
  • PWM x 4
  • UART x 3
  • Supports 40MHz XTAL
  • Supports audio ADC for voice command application


  • RTL8762AR: 32-pin 5x5mm QFN
  • RTL8762AG: 32-pin 5x5mm QFN
  • RTL8762AJ : 40-pin 5x5mm QFN
  • RTL8762AK: 56-pin 7x7mm QFN