CH552G

The CH552G is an enhanced 8051-core microcontroller by WCH, featuring USB 2.0 full-speed support, 24MHz operation, and 16KB Flash + 1KB RAM. It integrates ADC, PWM, UART, SPI, and I²C, making it suitable for USB-enabled embedded projects. Key highlights:
- Low-cost alternative to traditional USB MCUs.
- Built-in USB PHY, eliminating external components.
- 3.3V/5V tolerant I/O with 16 GPIOs.
- Low-power modes for battery applications.
Ideal for HID devices, USB peripherals, and DIY projects, the CH552G balances performance and affordability. Development is supported via Keil C51 or SDCC, with open-source toolchains available.

The CH552G is a USB-capable 8051-based microcontroller. Equivalent products include:
- CH551G: Similar but with less flash (10KB vs 16KB).
- CH554G: Enhanced with more RAM and USB support.
- STC15W4K32S4: 8051-based, but lacks native USB.
- EFM8UB1 (Silicon Labs): 8051-core with USB.
- AT89C51 (Atmel): Basic 8051, no USB.
For USB functionality, CH554G or EFM8UB1 are closer alternatives.

The CH552G is an enhanced 8051-based microcontroller with USB 2.0 full-speed support. Key features include:
- Core: 24MHz 8051 (3x faster than standard 8051).
- Memory: 16KB Flash, 1KB RAM, 128B EEPROM.
- USB: Built-in USB 2.0 controller (full-speed, no external crystal needed).
- GPIO: Up to 16 multifunctional I/O pins.
- Peripherals: UART, SPI, PWM, ADC (8-channel 10-bit), timers (3x 16-bit).
- Power: 2.7V–5.5V operation, low-power modes.
- Package: SOP16/TSSOP20.
Ideal for USB HID devices, adapters, and embedded systems requiring USB connectivity.

The CH552G is a 16-pin microcontroller with the following key functions:
- GPIO: 14 general-purpose I/O pins (P1.0–P1.7, P3.0–P3.5).
- USB: Full-speed USB 2.0 support (D+ and D- on P3.0 & P3.1).
- UART: Hardware UART (TXD on P3.1, RXD on P3.0).
- SPI & I²C: Support via GPIO pins.
- ADC: 8-channel 10-bit ADC (shared with P1 pins).
- PWM: 3 PWM outputs (P1.4, P1.5, P1.6).
- Timers/Counters: Two 16-bit timers.
- Interrupts: Multiple external and internal interrupt sources.
Power supply: VCC (5V) and GND. Compact and versatile for USB-enabled projects.

The CH552G is manufactured by WCH (Jiangsu Qinheng Microelectronics Co., Ltd.), a Chinese company specializing in microcontroller and interface IC design. WCH is known for producing cost-effective, 8-bit and 32-bit MCUs, USB controllers, and communication chips (e.g., USB-to-serial converters). Their products are widely used in consumer electronics, industrial control, and embedded systems.
The CH552G is an enhanced 8-bit 8051-compatible MCU with built-in USB functionality, often used in DIY projects and low-cost peripherals. WCH emphasizes affordability and ease of use, catering to hobbyists and small-scale manufacturers.
The company operates primarily in the domestic Chinese market but has gained global recognition for its budget-friendly solutions.

The CH552G, a cost-effective 8051-based microcontroller, is widely used in:
- HID Devices: Keyboards, mice, game controllers.
- USB Peripherals: USB-to-serial converters, flash drives.
- Consumer Electronics: Smart home gadgets, remote controls.
- Industrial Control: Sensor interfaces, simple automation.
- DIY & Prototyping: Arduino-compatible projects, embedded systems.
- Battery-Powered Devices: Low-power applications like wearables.
It supports USB 2.0, PWM, ADC, and GPIO, making it versatile for compact, low-cost designs.

The CH552G microcontroller is available in SOP-16 and SSOP-20 package types. These surface-mount packages are compact and suitable for space-constrained designs. The SOP-16 has 16 pins, while the SSOP-20 offers 20 pins with a smaller footprint. Both support USB functionality and are commonly used in embedded systems.