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Small green circuit board with USB connector and pin headers

Graviton

Graviton CH341A USB UART I2C SPI Parallel Converter 3.3V 5V Indicator

SKU CH-GXFQ-MB8RH

A USB-to-parallel and serial converter with selectable 3.3V or 5V levels and on-board status indicators

  • USB to UART, I2C and SPI interfaces
  • Parallel port support for EPP and EME modes
  • Selectable 3.3 V or 5 V output level
  • On-board status indicators for UART, I2C and SPI
  • CH341A programmer chip for reliable conversion

USB interface programmer for BIOS and EEPROM work

The Graviton CH341A converts a USB port into UART, I2C, SPI and parallel printer interfaces. It targets technicians and hobbyists who flash BIOS chips, configure microcontrollers or debug legacy parallel devices. The module includes selectable 3.3 or 5 V output levels and on-board status lamps for each serial bus.

Sustained flashing and debugging sessions

The converter maintains stable signalling during long programming cycles without timing drift. On-board indicator lamps show live traffic on UART, I2C and SPI lines so operators can verify activity at a glance. Selectable voltage levels prevent accidental over-voltage on sensitive 3.3 V targets during extended use.

Low heat, silent operation and minimal draw

The board runs cool enough for continuous bench use without active cooling. No moving parts mean completely silent operation in quiet lab environments. Current draw stays low, allowing reliable power from a standard USB port or hub without external supply.

How it compares

Measured against everything we stock in Tech Gadgets & Accessories, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 94% of the 5,998 comparable items (median $24.99).

Specifications

No published specifications for this item yet.

Questions about this item

Does the CH341A converter draw enough power to heat up during continuous all-day operation?

The module is rated for a dissipation power of 1, so it runs cool even when left powered continuously.

What voltage must the target board already provide for the CH341A to communicate over UART, I2C or SPI?

The board includes a jumper to select 3.3V or 5V signal levels, so the target must match whichever level you choose.

Can the CH341A parallel port replace a legacy PCI parallel card when driving an older printer?

Yes, it supports USB to printer parallel port with EPP and EME modes, letting a modern PC drive legacy parallel printers.

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