CH554T USB microcontroller with 16KB ROM 256-bytes IRAM 1.25Kbytes XRAM and DMA TSSOP20

Description

CH554T USB microcontroller with 16KB ROM 256-bytes IRAM 1.25Kbytes XRAM and DMA TSSOP20

Specifications for the CH554T USB microcontroller:

📦 General Information

• Manufacturer: WCH (Jiangsu QinHeng Corp.)

• Part Number: CH554T

• Core: Enhanced 8051-compatible MCU

• Package: TSSOP-20 (0.65 mm pitch)

• Clock Speed: Up to 24 MHz (internal PLL up to 48 MHz for USB)

• On-chip Oscillator: 12 MHz precision oscillator (calibrated, no external crystal required for USB)

💾 Memory

• Code ROM: 16 KB (Flash, reprogrammable)

• Internal RAM:

  • IRAM: 256 bytes (directly addressable)

  • XRAM: 1.25 KB (1280 bytes, expanded data memory)

• Bootloader: USB ISP for firmware update without extra programmer

⚡ Electrical Characteristics

• Operating voltage: 3.3 V – 5.0 V

• I/O levels: TTL/CMOS compatible

• Current consumption: ~12 mA at 12 MHz (typical)

• Low-power modes: Idle, Power-down

📡 Peripherals & Interfaces

• USB:

  • USB 2.0 full-speed device (12 Mbps)

  • Integrated USB transceiver and SIE

  • Supports USB-HID, USB-CDC, USB-MSC classes

• UART: 2 channels (with independent baud rate generators)

• SPI: Master/slave mode

• I²C: Hardware master/slave mode

• PWM: Multiple channels for control applications

• Timers: Standard 8051 timers + enhanced modes

• DMA: Hardware DMA controller for fast memory and peripheral transfers

🌡 Environmental Ratings

• Operating temperature: −40 °C to +85 °C (industrial grade)

• Storage temperature: −55 °C to +125 °C

📏 Package Details (TSSOP-20)

• Body size: ~6.5 mm × 4.4 mm

• Lead pitch: 0.65 mm

• Pin count: 20 pins

🔧 Applications

• USB-to-serial converters

• USB HID devices (keyboard, mouse, joystick)

• Low-cost USB data acquisition systems

• Firmware upgradeable USB peripherals

• Embedded control for consumer electronics