Manual CH330 (Nanjing Qinheng Microelectronics)

CH330 manual 1 USB to serial chip CH330 Manual Version: 1B http://wch.cn 1 Overview CH330 is a USB serial chip, a computer is used to expand UART common upgrade or serial devices to the USB bus. Computer or USB Asynchronous serial UART / RS232 / RS485 other USB CH330 adapter host 2. Features ● Simulate standard serial used to upgrade serial peripheral equipment, or by adding additional USB port. ● Serial application on the computer end of the Windows operating system is fully compatible without modification. ● Full-duplex hardware serial ports, built-in transceiver buffer, supports communication baud rate 100bps ~ 2Mbps. ● Support 7 or 8 data bits, supporting odd / even parity / logo / blank. ● By adding level conversion device, providing RS232, RS485 interfaces. ● Supports 5V and 3.3V supply voltages. 3, the package Package Width of plastic Lead pitch Package Description Ordering SOP-8 3.9mm 150mil 1.27mm 50mil Standard 8-pin SMD CH330N 4 pin Pin No. Name Types of Pin Description 5 VCC power supply The positive power supply input, requires an external power supply decoupling capacitor 0.1uF 3 GND power supply Common ground terminal directly connected to ground USB bus When connected to VCC power supply voltage input 3.3V external power supply 8 V3 power supply voltage of 5V when the capacity of an external decoupling capacitor 0.1uF 1 UD + USB Signal Directly to the USB bus data lines D + 2 UD- USB Signal D- data lines directly connected to the USB bus 6 TXD Export Serial data output, high idle 7 RXD Serial data input, the pull-up resistor, idles in the high 4 RTS # Export MODEM communication output signals, request, active LOW 5, Function CH330 chip using 5V operating voltage, the VCC pin external 5V power supply, and capacity V3 pin external power supply decoupling capacitor is 0.1uF. When CH330 chip operates at 3.3V, V3 pin should be connected to VCC and input 3.3V Document Outline 1、概述 2、特点 3、封装 4、引脚 5、功能说明 6、参数 6.1. 绝对最大值 6.2. 电气参数 7、USB转RS232串口应用 8、连接单片机串口，各自供电