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- CH559 has more features and bigger flash size.
- Support USB hub, two USB transceiver, one is normal speed (female A USB pin “DP DM” and micro USB), one is high speed (On board marked “HS USB, pin HP HM”).
- All lead out pins.
- On board power led, four programming leds IO P1.4-P1.7.
- Fuse protection on input power pins 3.3V and 5V.
- 2*3 jumper select 3.3V / 5V and ON/OFF, both 5V or 3.3V can work by chip.
- Lead out pinheader 1×4: serial UART port, logic level complaint.
- On board optional crystal reserved.
- USB directly programming. To enter into flash bootloader mode, hold down PROG button, and press RESET button.
- New version improve the USB part, and board layout
WCH CH55x Series: