A basic breakout board for WCH’s CH9121 chip – a two channel UART to Ethernet bridge, providing bidirectional transparent data transmission between TTL UART and RJ45 Ethernet.
Features / Specs
- Ethernet Chip: WCH CH9121
- Supply Voltage: 3.3VDC / 5VDC
- Ethernet Socket: RJ45 (10Mbps / 100Mbps / IEEE802.3 Compatible)
- UART Logic Level: 3.3VDC / 5VDC
- UART Baud Rate Range: 300 ~ 921600bps
- UART Data Bits: 5 / 6 / 7 / 8
- UART Stop Bit: 1 / 2
- UART Parity Bit: None / Odd / Even
- Supported Protocols: TCP / UDP / IPV4 / ICMP / IGMP / DHCP / ARP
- Supported Working Modes: TCP Server / TCP Client / UDP Server / UDP Client
- Ethernet Data Cache: 6kB
- Operating Temperature Range: ~(-40℃ to +85℃)
- Electrical Protection: 2kV Electromagnetic Isolation
- Dimensions: ~(47.5mm x 25.6mm x 17.5mm)
- Header Pin Pitch: 2.54mm
Pin Description
- RSTI-> External reset input. Active low with internal pull-up
- RESET-> Restore to factory settings. Detected on power-up. Active low
- CFG-> UART config mode input. Active High with internal pull-up. Low to enter configuration. High to exit configuration
- DIR-> RS485 receive and transmit switching control pin
- TCPCS-> TCP port connection status indication. Active in TCP client mode. Outputs low when there has been a successful connection
- RXD2-> Asynchronous UART 2 RX (disabled by default)
- RXD-> Asynchronous UART 1 RX (enabled by default)
- TXD2-> Asynchronous UART 2 TX (disabled by default)
- TXD-> Asynchronous UART 2 TX (enabled by default)
- RUN-> Operating status indication pin
- 3.3V-> Supply Voltage (3.3VDC @ > 200mA)
- GND-> Ground
- 5V-> Supply Voltage (5VDC @ > 200mA)