WCH CH438Q

CH438 is an eight- UART chip, which contains eight UARTs compatible with 16C550 or 16C750 and supports the communication baud rate up to 4Mbps. It can be used for RS232 extension of MCU/embedded system, high- speed UART with automatic hardware rate control, RS485 communication, etc.

• Eight fully independent UARTs, compatible with 16C550, 16C552, 16C554 and 16C750 and enhanced.
• Support 5, 6, 7 or 8 data bits and 1 or 2 stop bits.
• Support the verification modes of odd, even, null verification, blank 0 and flag 1.
• Programmable communication baud rate, support communication baud rate of 115200bps and up to 4Mbps.
• Built-in 128-byte FIFO buffer, support four FIFO trigger levels.
• Support MODEM signals CTS, DSR, RI, DCD, DTR and RTS, which can be converted to RS232 level by 75232 chip.
• Support automatic handshake and automatic transmission rate control of hardware flow control signals CTS and RTS, compatible with TL16C550C.
• Support serial port frame error detection and Break line interval detection.
• Built-in clock oscillator, supporting the crystal with frequency range of 0.9216MHz-32MHz, using 22.1184MHz crystal by default.
• Provide 10MB 8-bit passive parallel interface to connect MCU.
• The parallel interface contains an 8-bit data bus, a 7-bit address, and a 3-wire control: chip selection input, write strobe and optional read strobe.
• Support direct and multiplexed addresses: input the 7-bit address directly or latch the address by ALE signal control from the data bus.
• The interrupt output pin is an optional connection and is active at low level. It can be replaced by querying the interrupt flag bit in the register.
• Support 5V or 3.3V supply voltage and support serial port low- power sleep mode.
• Provide LQFP- 44 and LQFP- 128 lead- free package, and be compatible with RoHS.