CH9434

Overview:

CH9434 is an SPI to Quad UART control chip, providing four sets of full-duplex 9-line asynchronous serial ports for expanding asynchronous serial ports in microcontrollers/embedded systems. CH9434 incorporates four asynchronous serial ports compatible with 16C550, supporting communication at a maximum rate of 4Mbps. It supports GPIO and features a half-duplex automatic switching pin (TNOW) for both transmission and reception.

Features:

– Operating voltage: 3.3V.
– Supports communication baud rate settings, with a range of 1200-4000000bps.
– Independent FIFO buffers for each direction of the serial port, with a capacity of 1536 bytes for transmission and 2048 bytes for reception.
– Four fully independent asynchronous serial ports, compatible with 16C550 and enhanced features.
– Serial ports support 5/6/7/8 data bits and 1/2 stop bits.
– Serial ports support various parity check modes, including odd, even, none, space 0, and mark 1.
– Supports common MODEM contact signals: RTS, DTR, DCD, RI, DSR, CTS.
– Provides a half-duplex RS485 enable pin.
– SPI with a maximum speed of up to 32Mbit/s.
– Supports low-power sleep mode, wake-up through SPI interface.
– Configurable GPIO functionality provided by the chip.
– External 32M crystal for clock supply.
– Lead-free QFN48 package, RoHS compliant.

Application Areas:

– MCU/DSP/Embedded Systems.
– Industrial automation RS-485 communication.
– Serial port servers, multi-serial port cards.
– Wireless transmission with Bluetooth, 4G, WiFi, and other serial modules.