Overview

---

The BK3635 is a highly-integrated single-chip Bluetooth 5.2 (BR/LE) and 2.4 GHz proprietary system-on-chip (SoC). It integrates a high-performance 2.4 GHz RF transceiver, a feature-rich baseband processor, a memory controller, multiple analog and digital peripherals, as well as Bluetooth and 2.4 GHz proprietary protocol stacks.
Using advanced design techniques and ultra-low-power process technology, the BK3635 delivers high integration and minimal power consumption for a wide range of IoT (Internet of Things) and HID (Human Interface Devices) applications such as voice remotes, wearables, mouse devices, keyboards and USB dongles, etc.

Features

---

Bluetooth 5.2 + 2.4 GHz Proprietary
• Bluetooth 5.2 and 2.4 GHz proprietary
• Supports Bluetooth Basic Rate (BR), Bluetooth Low Energy (LE) 1 Mbps and 2 Mbps
• Supports 2.4 GHz proprietary 1 Mbps, 2 Mbps and 250 kbps
• TX power up to +5 dBm
• RX sensitivity -95 dBm

Core and Memory
• 32-bit RISC MCU at up to 16 MHz
• Embedded 160 KB Flash with read-out protection
• 32 KB RAM
• JTAG for debugging and SPI flash download

Clock Management
• External oscillators: 16 MHz crystal oscillator (X16M), 32.768 kHz crystal oscillator (X32K)
• Internal oscillator: 16 MHz digitally controlled oscillator (DCO), 32 kHz ring oscillator (ROSC)
• 48 MHz USB PLL

Power Management
• 1.8 to 3.6 V VCC3BAT supply
• 4.75 to 5.25 V VCC5USB supply
• On-chip power-on reset (POR) and brown-out detector (BOD)
• Embedded buck (DC-DC) converter and LDO regulators
• Low power consumption:
- Active mode RX, buck mode: 8 mA
- Active mode TX 0 dBm, buck mode: 6 mA
- Normal standby mode: TBD μA
- Low voltage standby mode: TBD μA
- Deep sleep mode: 1.7 μA

Peripherals
• GPIOs: 39 in QFN56 (BK3635QN56), 19 in QFN32 (BK3635QN32)
• 1x SPI
• 2x UART
• 1x I2C
• 1x full speed USB2.0/1.1
• 6x 32-bit PWM
• 1x I2S/PCM
• 10-bit SAR ADC, up to 13 channels
• 6x general-purpose 32-bit timer/counter
• 1x watchdog timer
• 1x low-power timer
• 1x temperature sensor
• 1x true random number generator (TRNG)
• AES 128-bit hardware accelerator

Packaging
• QFN56 package, 7 x 7 mm
• QFN32 package, 4 x 4 mm
• Operating temperature range: -40 to +85°C