ITEM NAME:CH340C Micro USB to TTL Serial Port ISP Download Module for Win 10 8 7 XP Product Description Description: HW-624 CH340C Micro USB to TTL Serial Port ISP Download Module 5V/3.3V 500mA for Windows 10 8 7 XP Specifications: Operating voltage: 5V or 3.3V Default operating voltage: 5V Operating temperature: -40~ +85℃ Transmission rate: 50 ~ 2MHz Operating system: for Windows xp, win7,8,10 Data bits: 5bit, 6Bit, 7bit, 8bit Verification: odd, even, no, Mark Stop bits: 1,2 Product size: 22mm*10mm*5mm/0.87*0.39*0.20" Weight: 4g ISP and communication: Support STC MCU downloader Support for STM8 downloader with boothloader Support for Arduino downloader with boothloader Support STM32 serial download program Pin Description: V+ VCC power positive input and output: 5V power supply output when 5V working voltage, external 3.3V power supply when 3.3V working voltage V- GND Power supply negative: 0V TX TXD data sender: connect to the microcontroller or target data receiver RX RXD data receiving end: connect the single chip or the target board data sending end Notes: 1. There may be slight size deviations due to manual measurement, different measuring methods and tools. 2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor. Included: 1 X Download Module.ISP and communication Support STM32 serial download program. Included: 1 X Download Module. Verification: odd, even, no, Mark. RX RXD data receiving end: connect the single chip or the target board data sending end.