1 CH330 manual 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
other USB USB Asynchronous serial UART / RS232 / RS485 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 Lead pitch Width of plastic SOP-8 3.9mm 150mil 1.27mm 50mil Package Description Ordering Standard 8-pin SMD CH330N 4 pin
Pin No. Name Types of Pin Description 5 VCC power supply 3 GND power supply 8 V3 power supply 1 UD + USB Signal 2 UD-USB Signal 6 TXD Export 7 RXD Serial data input, the pull-up resistor, idles in the high 4 RTS # Export The positive power supply input, requires an external power supply decoupling capacitor 0.1uF
Common ground terminal directly connected to ground USB bus
When connected to VCC power supply voltage input 3.3V external power supply
voltage of 5V when the capacity of an external decoupling capacitor 0.1uF Directly to the USB bus data lines D +
D-data lines directly connected to the USB bus Serial data output, high idle 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 2 CH330 manual Power supply, the operating voltage and the other circuit connected CH330 not exceed 3.3V.
CH330 allows the serial baud rate error of the received signal is not less than 2%, the baud rate of the serial signal transmission error is less than 1.2%. 6, parameters
6.1. Absolute maximum (equal to or exceed absolute maximum value will likely cause the chip does not work properly or even damage) name Minimum Maximum Unit Parameter Description TA Ambient temperature at work -20 70 ℃ TS The ambient temperature during storage -55 100 ℃ -0.5 6.0 V -0.5 VCC + 0.5 V VCC Supply voltage (VCC power supply connected, GND Ground) VIO Voltage on the input or output pins 6.2 Electrical parameter …