CH9434 - 4-UART Chip
Power ground The internal power supply of the chip needs to be externally connected to a decoupling capacitor if short-circuited with other VDD.
The capacitance value is recommended not to be less than 0.1uF.
Internal power supply of the chip, short-circuited with other VDD.
The internal power suppl
CH9434 Datasheet 1 http://wch.cn 4-UART Chip CH9434 Datasheet Version: 1A http://wch.cn 1.
Overview CH9434 is a SPI to 4-UART transfer chip, which provides four full duplex nine-line UARTs, and is used to extend UART for MCU/embedded system.
CH9434 includes four UARTs compatible with 16C550 and supports up to 4Mbps baud rate communication.
It supports up to 25-channel GPIO and provides half-duplex transceiver automatic switch pin TNOW.
MCU SCS# SCK SDI SDO INT# CH9434 RXD0/TXD0/CTS0/RTS0
CH9434 Features
* Operating voltage: 3.3V
* Support communication baud rate setting, with the baud rate range of 1200-4000000bps.
* UART has an independent FIFO buffer in each direction, sending 1536 bytes and receiving 2048 bytes.
* Four fully independent UARTs, compatible with 16C550 and enhanced.
