CH571K BLE wireless communication 32-bit RISC microcontroller ESSOP10 chip

Description

CH571K BLE wireless communication 32-bit RISC microcontroller ESSOP10 chip

the WCH CH571K BLE-enabled 32-bit RISC microcontroller (also sometimes referenced with ESSOP10 package; “ESSOP-10” refers to its very small 10-pin chip package) based on available datasheet information and component listings:

Core & Architecture

• CPU: 32-bit RISC-V microcontroller core (WCH RISC-V3A) with support for the RV32IMAC instruction set (hardware multiply/divide) similar to other CH57x BLE MCUs.

• RISC-V FEATURES: Low-power execution, 2-stage pipeline, and optimized interrupt response.

Wireless Connectivity

• Bluetooth: Integrated Bluetooth Low Energy (BLE), compliant with Bluetooth Low Energy v4.2.

• 2.4 GHz RF: On-chip 2.4 GHz RF transceiver with baseband and link control.

• RF Performance (approx):

  • RX sensitivity ~ −93 dBm (package-limited vs larger QFN chips)

  • Programmable TX power (approx −20 dBm to +5 dBm)

  • Typical BLE communication range ≈ ~170 m with onboard antenna @0 dBm.

Memory

• FlashROM: ~192 KB user application + boot + data flash areas (CH571 family has smaller flash than CH573; exact split depends on variant).

• SRAM: ~18 KB volatile SRAM (RAM).
  (Note: these numbers are typical for CH571 series; the CH571K variant follows this pattern.)

Peripherals & Interfaces

• GPIOs: Few general-purpose IO pins exposed (limited by 10-pin package).

• Communication Interfaces:

  • UART support (e.g., programming/debug and serial comm).

  • SPI interface.

  • (Possibly I²C if supported in this small variant).

• ADC: Built-in ADC channels for analog input.

• Timers: On-chip timer resources (multiple timers supporting PWM/capture).

System & Clock

• System Clock: Typically driven by a 32 MHz external oscillator (required for BLE).

• Low-power oscillator: ~32 kHz support for RTC/sleep.

Power & Low-Power Modes

• Supply Voltage: Rated at ~2.3 V to 3.6 V (3.3 V typical).

• Low-Power Support:

  • Sleep mode current in the single-digit microamp range.

  • Dedicated low-power retention RTC and peripheral support.

Security

• AES encryption engine and unique chip ID for secure BLE communication.

Package

• ESSOP-10 package (very small 10-pin surface-mount chip).

• Ultra-minimal physical footprint makes it suitable for tiny BLE devices.

Typical Applications

• Tiny BLE peripherals (e.g., wireless sensors, wearables, simple remote controls).

• Minimal-component BLE projects with simple UART/ADC interfaces.

• Space-constrained IoT end nodes or smart tags.

Notes & Comparisons

• CH571K is a stripped-down member of the CH57x family (versus larger CH573/CH582 parts) with fewer GPIOs and more limited resources to suit ultra-small, low-cost BLE nodes.

• BLE support aligns more with BLE 4.x (v4.2) rather than the latest BLE 5.x stacks seen in newer CH59x parts.