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CH340C
CH340C
USB UART bridge
CH340C is a USB to serial chip that supports full-speed USB communication, RS232, and optional infrared (IrDA) functionality.
In stock
Specifications
8- Operating Voltage
- 5V or 3.3V source voltage supported.
- Supply Current
- 12-30mA when VCC=5V, 0.05-0.08mA when USB suspending (VCC=3.3V) mA
- Interface
- USB
- Resolution
- Baud rate error < 0.3% for serial transfer, >= 0.2% for receive %
- Range
- 50-153600 baud rates supported
- Accuracy
- Baud rate accuracy within specified range
- Temperature Range
- -40 to 85°C operating, -55 to 125°C storage °C
- Package
- SSOP-20 package
Pinout
17Low source legibility.The original manufacturer datasheet for this part was difficult to read, so this pinout may be incomplete or imperfect. Always confirm against the specific manufacturer’s datasheet before wiring.
| Pin | Name | Functions | Notes |
|---|---|---|---|
| VCC | Positive power input port | POWER | Requires an external 0.1uF decoupling capacitance |
| GND | Public ground | GND | |
| 5V3 | Connects of VCC to input outside power while 3.3V, connects of 0.01uF decoupling capacitance outside while 5V | POWER | |
| 9XI | Input of crystal oscillator | GPIO | |
| 10XO | Opposite output of crystal oscillator | GPIO | |
| 6UD+ | Directly connect to D+ data wire of USB bus, set up pull-up resistor internal | GPIO | |
| 7UD- | Directly connect to D- data wire of USB bus | GPIO | |
| 20NOS# | Forbid USB device suspending, active with low, set up pull-up resistor internal | GPIO | |
| 3TXD | Serial data output | UART | |
| 4RXD | Serial data input | UART | |
| 11CTS# | MODEM liaison input signal, clear sending, active with low(high) | GPIO | |
| 12DSR# | MODEM liaison input signal, data equipment is ready, active with low(high) | GPIO | |
| 13RI# | MODEM liaison input signal, oscillate ring to prompt, active with low(high) | GPIO | |
| 14DCD# | MODEM liaison input signal, carrier wave detection, active with low(high) | GPIO | |
| 15DTR# | MODEM liaison output signal, data endpoint is ready, active with low(high) | GPIO | |
| 16RTS# | MODEM liaison output signal, request to send, active with low(high) | GPIO | |
| 2ACT# | CH340T:negative phasic clock output (CH340R:USB configuration is finished state output, active with low) | GPIO |
Interactive pinout
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CH340C
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