CH552 Development Board Core Board USB Communication 51 MCU Module Low Cost

CH552 development board, enhanced 51 core with built-in USB controller. Supports USB download and communication. 24MHz, 16KB Flash. Onboard button and LED. Ideal for USB device development, HID keyboard/mouse, DIY peripherals, low-cost embedded projects. No programmer needed, direct USB download

CH552 Development Board Application features:

◆ Main Chip
CH552 (enhanced 51 microcontroller)

◆ Core
MCS-51 compatible, single-cycle instruction

◆ Clock Speed
24MHz (built-in RC oscillator)

◆ Memory

• Flash: 16KB

• RAM: 1KB

• Data Flash: 1KB (EEPROM emulation)

◆ USB Features

• Built-in USB 2.0 controller

• USB download support (no programmer needed)

• Supports HID/CDC/custom devices

◆ Peripherals

• UART ×2

• SPI ×1

• I2C ×1

• ADC ×4 (10-bit)

• PWM ×3 (8-bit)

• Touch buttons ×6

◆ Onboard Resources

• Reset button

• User button

• Power LED

• User LED

• USB Type-C/Micro port

◆ Pin Headers
All IOs broken out (2.54mm pitch)

◆ Programming Methods

• USB download (official tool)

• Arduino IDE (third-party support)

◆ Typical Applications

• USB HID keyboard/mouse

• USB to serial converter

• Custom USB devices

• DIY game controller

• Low-cost embedded control

• LED strip control

• Sensor data acquisition

◆ Key Advantages

• Built-in USB, no external chip needed

• Direct USB download, no programmer required

• Low cost

• Compact size

• Great for USB learning

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FAQ

1. What is the CH552 Development Board / Core Board?
The CH552 Development Board / Core Board is a low-cost 51 MCU learning and development platform based on the CH552 microcontroller. The CH552 is an enhanced E8051 core MCU from WCH (Nanjing Qinheng Microelectronics), fully compatible with the MCS51 instruction set. 79% of its instructions are single-byte single-cycle, with an average execution speed 8–15 times faster than the standard MCS51. The chip features a built-in USB device controller and full-speed transceiver, allowing direct program download via USB without an external programmer. Development boards are typically offered as minimum system boards with all I/Os exposed, suitable for USB peripheral development and 51 MCU learning.

2. What are the key specifications of the CH552 Development Board / Core Board?

• Core: Enhanced E8051, compatible with MCS51 instruction set

• Frequency: Up to 24MHz

• Program Memory (ROM) : 16KB Code Flash

• Internal RAM (iRAM) : 256 bytes

• Extended RAM (xRAM) : 1KB, supports DMA

• DataFlash: 128 bytes, byte-level read/write

• BootLoader: 2KB, supports USB and UART ISP

• USB: USB 2.0 Full-speed 12Mbps, Device mode

• ADC: 4-channel 8-bit ADC

• Touch Keys: 6-channel capacitive detection, supports up to 15 touch buttons

• Timers: 3 timer/counter sets

• PWM: 2 PWM outputs

• UART: 2 full-duplex async serial ports (UART0 + UART1)

• SPI: 1 SPI interface, Master/Slave mode

• Operating Voltage: 5V or 3.3V (built-in 5V→3.3V LDO)

3. What package does the CH552 use?
The CH552 offers multiple package options, including TSSOP20, SOP16, QFN16, and MSOP10. Different suffixes indicate different packages:

• CH552G: SOP-16 package

• CH552T: TSSOP-20 package

• CH552E: MSOP-10 package

• CH552P: QFN-16 package

Development boards/cores typically use TSSOP-20 or SOP-16 packaged chips, with all I/Os exposed via 2.54mm pitch pin headers.

4. What applications is the CH552 Development Board / Core Board suitable for?
The CH552 is widely used in various low-cost USB and embedded projects:

• USB HID devices: Keyboards, mice, game controllers, numeric keypads

• BadUSB / security testing tools

• USB-to-serial / data acquisition devices

• Touch key applications (6-channel capacitive touch support)

• Smart home and IoT edge devices

• Voice-controlled keyboards / voice control devices

• USB-controlled small display devices

• Industrial control and sensor data acquisition

5. What development tools support the CH552 Development Board / Core Board?
The CH552 supports multiple development approaches:

(1) Keil C51 (Official Recommended) : Install Keil C51, then use WCHISPStudio to add the WCH MCU device library to Keil. Refer to the official CH552EVT.ZIP example package.

(2) WCHISPStudio (Official Programming Tool) : WCH's dedicated programming tool supporting one-click USB download.

(3) Open-source (VSCode + SDCC + Make) : Fully open-source and free development environment.

(4) Arduino IDE: Community-maintained CH55xduino core package supports Arduino development. Note: The CH552 uses a C compiler (not C++), so standard Arduino libraries cannot be used.

(5) PlatformIO: Supports cross-platform development (Windows, Linux, macOS).

6. What is the operating temperature range of the CH552 Development Board / Core Board?
The CH552 operates over a temperature range of -40°C to +85°C (industrial grade). The CH552 features low-power design with operating current of approximately 4mA.

7. How do you program the CH552?
The CH552 supports two programming methods:

(1) USB Download (Recommended) : Connect the development board to a PC via USB, press and hold the BOOT button, then plug in the USB to enter programming mode. Use WCHISPStudio to select the firmware file and click download.

(2) UART ISP Download: Download via UART0 (P3.0/P3.1) using a dedicated ISP tool.

⚠️ Note: The CH552 uses low-cost ROM technology with a Flash write endurance of approximately 200 cycles. Actual endurance may be higher (some tests show 300+ cycles), but frequent programming should be noted.

8. What peripheral interfaces does the CH552 support?
The CH552 integrates rich peripheral interfaces:

• GPIO: Up to 17 general-purpose I/O pins

• USB 2.0: Full-speed 12Mbps Device, Type-C detection support

• UART: 2 full-duplex async serial ports

• SPI: 1 Master/Slave SPI interface

• ADC: 4-channel 8-bit ADC

• PWM: 2 8-bit PWM outputs

• Touch Keys: 6-channel capacitive detection

• Timers: 3 timer/counter sets with signal capture support

9. What is the difference between CH552 and CH551?
CH551 is a simplified version of CH552. Key differences:

10. What power supply options does the CH552 Development Board / Core Board support?
The CH552 features a built-in 5V to 3.3V Low Dropout Regulator (LDO) , supporting flexible power options:

• USB Power (Recommended) : Power directly via USB port; onboard LDO converts 5V to 3.3V for the chip

• External 5V Power: Apply 5V via the VCC pin, enabling the internal LDO

• External 3.3V Power: Short VCC and V33 together, apply 3.3V directly

⚠️ Note: The CH552's logic level depends on the power method — when using the internal LDO, the high level is 3.3V; when shorting VCC/V33, the logic level matches the input voltage.