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 🔧 Applica