Serial Ethernet Penetrate Transparent IC CH9121


CH9121 has Built-in TCP/IP protocol stack, which can provides serial data and network data’s two-way penetrate transparent. CH9121 has TCP-Client, TCP-Server and UDP 3 kinds of work mode, supports serial baud rate up to 921600bps, can be easily configured by host PC software. The application diagram for CH9121 is shown below:


  • Built-in Ethernet MAC and PHY.
  • Two-way penetrate transparent of serial data and network data.
  • Supports 10 / 100M, full duplex / half duplex adaptive Ethernet interface, fully compatible with IEEE 802.3 protocol.
  • Auto MDI/MDIX switching.
  • Supports 3 kinds of work mode: TCP-Client, TCP-Server and UDP.
  • Supports serial baud rate from 300bps to 921600bps.
  • TTL logic level, compatible with 3.3V and 5V.
  • Serial port supports both full duplex and half duplex, supports RS485 auto direction control.
  • Work mode, port, Ethernet configurations can be set by host PC software.
  • Virtual Serial Port Supported.

relation files

file name file content
CH395DS1.PDF CH395 datasheet. TCP/IP Ethernet protocol stack chip, integrated 10/100M MAC and PHY transceiver, built-in DHCP, ARP, ICMP, IGMP, UDP and TCP protocol firmware, supports SPI/8-bit parallel port/asynchronous serial port and up to 8 sockets, supports MCU system to connect to Ethernet.