If your motherboard has standby power (e.g., CMOS battery or laptop battery), the chip will be "hot" with 3.3V already. Connecting the CH341A can cause a voltage conflict.
The term "hot mode" or "hot" in certain contexts (like 1.1.1 ) sometimes refers to —using a SOP8 test clip to flash the chip while it is still soldered to the motherboard.
Ultimate Troubleshooting Guide: NeoProgrammer 2.1.0.19 & CH341A Getting Hot neoprogrammer 21019 ch341a hot
Here is the technical breakdown and a "paper" (schematic description) for the power section of the Neoprogrammer CH341A (common versions).
The "hot" fix involves cutting the trace to pin 28 (VCC) or using a level shifter. A correctly modified "hot" CH341A outputs ~3.3V on the VCC pin. In enthusiast jargon, a "hot" CH341A is one that has been surgically modified to not destroy your expensive laptop motherboard. If your motherboard has standby power (e
NeoProgrammer 2.1.0.19 natively supports an extensive array of architectures: Chip Category Supported Types & Series Standard BIOS chips (25xxx series) SPI NAND Flash High-density experimental storage chips EEPROMs I2Ccap I squared cap C (24Cxx), MicroWire (93Cxx), SPI (25xxx, 95xxx) Specialty Storage SPI F-RAMs / FRAMs, Automotive chips (M35080, ST95P08) Microcontrollers (MCU) AVR Mcu (ATmega, ATtiny), NUVOTON (N76E003), ENE KB90xx 📋 Step-by-Step Guide: How to Flash Safely
The CH341A is a versatile USB bus converter chip produced by Nanjing Qinheng Microelectronics. It acts as a bridge, allowing a computer to communicate via USB and translate those commands into various other protocols, including UART, I2C, SPI, and even a parallel printer port. For programming, we primarily use its SPI and I2C capabilities. Ultimate Troubleshooting Guide: NeoProgrammer 2
A dangerous oversight in original CH341A designs: The chip runs at 5V logic, but SPI flash chips are 3.3V devices. Sending 5V signals will eventually fry the flash.