CH340K
The CH340K is an electronic component from WCH. View the full CH340K datasheet below including absolute maximum ratings.
Manufacturer
WCH
Overview
Part: CH340 — WCH Type: USB to Serial Port Adapter Description: The CH340 is a USB bus adapter chip that provides a full-speed USB device interface compatible with USB V2.0, emulating a standard serial port with communication baud rates from 50bps to 2Mbps, and supporting 5V or 3.3V power supply voltages.
Operating Conditions:
- Supply voltage: 3.1–5.3 V (for 5V operation: 4.0–5.3 V; for 3.3V operation: 3.1–3.6 V)
- Operating temperature: -40 to 85 °C (for CH340G/T/R); -20 to 70 °C (for CH340C/N/K/E/X/B)
- Communication baud rate: 50bps – 2Mbps
Absolute Maximum Ratings:
- Max supply voltage: 6.0 V
- Max junction/storage temperature: 125 °C
Key Specs:
- Operating supply current (5V, CH340G/C/N/K/E/X/T/R): 7 mA (typ), 20 mA (max)
- Operating supply current (3.3V, CH340G/C/N/K/E/X/T/R): 4 mA (typ), 12 mA (max)
- USB Suspend current (5V, CH340C/N/E/X): 0.05 mA (typ), 0.15 mA (max)
- Low-level input voltage (5V): 0.9 V (max)
- High-level input voltage (5V): 2.3 V (min)
- Low-level output voltage (5V, 6mA sink): 0.5 V (max)
- High-level output voltage (5V, 2mA source): VCC-0.6 V (min)
- Power-on reset voltage threshold: 2.4 V (min), 2.6 V (typ), 2.8 V (max)
Features:
- Full-speed USB device interface, compatible with USB V2.0.
- Emulates standard serial port, compatible with Windows serial port applications.
- Hardware full-duplex serial port, built-in transceiver buffer.
- Supports common MODEM handshake signals: RTS, DTR, DCD, RI, DSR, CTS.
- Provides RS232, RS485, RS422 interfaces through external level conversion.
- CH340R supports IrDA specification SIR infrared communication.
- Supports 5V and 3.3V power supply voltages.
- CH340C/N/K/E/X/B have built-in clock, no external crystal oscillator required.
- CH340B has built-in EEPROM for configuring serial numbers.
Applications:
- Upgrading original serial peripheral devices to USB.
- Adding extra serial ports to computers via USB.
- Multi-mode MCU download.
- SIR infrared communication (CH340R).
Package:
- SOP-16
- SOP-8
- ESSOP-10
- MSOP-10
- SSOP-20
Features
- Full-speed USB device interface, compatible with USB V2.0.
- Emulates standard serial port, used for upgrading original serial peripheral devices, or adding extra serial ports via USB.
- Serial port applications under Windows operating system on the computer side are fully compatible, no modification required.
- Hardware full-duplex serial port, built-in transceiver buffer, supports communication baud rate 50bps ~ 2Mbps.
- Supports common MODEM handshake signals RTS, DTR, DCD, RI, DSR, CTS.
- Provides RS232, RS485, RS422 and other interfaces through external level conversion devices.
- CH340R chip supports IrDA specification SIR infrared communication, supports baud rates from 2400bps to 115200bps.
- Built-in firmware, software compatible with CH341, can directly use CH341's VCP driver.
- Supports 5V power supply voltage and 3.3V power supply voltage.
- CH340C/N/K/E/X/B have built-in clock, no external crystal oscillator required, CH340B also has built-in EEPROM for configuring serial numbers, etc.
- Provides SOP-16, SOP-8 and SSOP-20 as well as ESSOP-10, MSOP-10 lead-free packages, RoHS compliant.
Absolute Maximum Ratings
| Name | Parameter Description | Parameter Description | Min | Max | Unit |
|---|---|---|---|---|---|
| TA | Operating | CH340G/T/R | -40 | 85 | °C |
| TA | Ambient Temperature | CH340C/N/K/E/X/B | -20 | 70 | °C |
| TS | Storage Ambient Temperature | Storage Ambient Temperature | -55 | 125 | °C |
| VCC | Power Supply Voltage | (VCC connected to power, GND connected to ground) | -0.5 | 6.0 | V |
| VIO | Voltage on Input or Output Pin | Voltage on Input or Output Pin | -0.5 | VCC+0.5 | V |
- 6.2. 5V Electrical Parameters (Test conditions: TA=25 °C, VCC=5V, excluding pins connected to USB bus)
- 6.3. 3.3V Electrical Parameters (Test conditions: TA=25 °C, VCC=V3=3.3V, excluding pins connected to USB bus)
| Name | Parameter Description | Parameter Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| VCC | Power Supply Voltage | V3 pin only external capacitor, not connected to VCC | 4.0 | 5 | 5.3 | V |
| ICC | Operating CH340G/C/N/K/E/X/T/R | Operating CH340G/C/N/K/E/X/T/R | 7 | 20 | mA | |
| ICC | Total Supply Current CH340B | Total Supply Current CH340B | 6 | 15 | mA | |
| ISLP | USB Suspend CH340G/K/T/R/B | USB Suspend CH340G/K/T/R/B | 0.09 | 0.2 | mA | |
| ISLP | Total Supply Current CH340C/N/E/X | Total Supply Current CH340C/N/E/X | 0.05 | 0.15 | mA | |
| VIL | Low-Level Input Voltage | Low-Level Input Voltage | 0 | 0.9 | V | |
| VIH | High-Level Input Voltage | High-Level Input Voltage | 2.3 | VCC | V | |
| VOL | Low-Level Output Voltage (6mA sink current) | Low-Level Output Voltage (6mA sink current) | 0.5 | V | ||
| VOH | High-Level Output Voltage (2mA source current) (Chip reset period only 100μA source current) | High-Level Output Voltage (2mA source current) (Chip reset period only 100μA source current) | VCC-0.6 | V | ||
| IUP | Input Current of Input Pin with Built-in Pull-up Resistor | Input Current of Input Pin with Built-in Pull-up Resistor | 3 | 150 | 300 | μA |
| IDN | Input Current of Input Pin with Built-in Pull-down Resistor | Input Current of Input Pin with Built-in Pull-down Resistor | -40 | -100 | -300 | μA |
| VR | Power-on Reset Voltage Threshold | Power-on Reset Voltage Threshold | 2.4 | 2.6 | 2.8 | V |
| Name | Parameter Description | Parameter Description | Parameter Description | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|---|
| VCC | Power Supply V3 Pin Connection | Power Supply V3 Pin Connection | CH340G/T/R | 2.9 | 3.3 | 3.6 | V |
| VCC | Voltage | VCC Pin CH340C/N/K/E/X/B | VCC Pin CH340C/N/K/E/X/B | 3.1 | 3.3 | 3.6 | V |
| ICC | Operating | Operating | CH340G/C/N/K/E/X/T/R | 4 | 12 | mA | |
| ICC | Total Supply Current | Total Supply Current | CH340B | 3 | 9 | mA | |
| ISLP | USB Suspend | USB Suspend | CH340G/K/T/R/B | 0.08 | 0.2 | mA | |
| ISLP | Total Supply Current | Total Supply Current | CH340C/N/E/X | 0.04 | 0.15 | mA | |
| VIL | Low-Level Input Voltage | Low-Level Input Voltage | Low-Level Input Voltage | 0 | 0.8 | V | |
| VIH | High-Level Input Voltage | High-Level Input Voltage | High-Level Input Voltage | 1.9 | VCC | V | |
| VOL | Low-Level Output Voltage (4mA sink current) | Low-Level Output Voltage (4mA sink current) | Low-Level Output Voltage (4mA sink current) | 0.5 | V | ||
| VOH | High-Level Output Voltage (2mA source current) (Chip reset period only 40μA source current) | High-Level Output Voltage (2mA source current) (Chip reset period only 40μA source current) | High-Level Output Voltage (2mA source current) (Chip reset period only 40μA source current) | VCC-0.6 | V | ||
| IUP | Input Current of Input Pin with Built-in Pull-up Resistor | Input Current of Input Pin with Built-in Pull-up Resistor | Input Current of Input Pin with Built-in Pull-up Resistor | 3 | 70 | 200 | μA |
| IDN | Input Current of Input Pin with Built-in Pull-down Resistor | Input Current of Input Pin with Built-in Pull-down Resistor | Input Current of Input Pin with Built-in Pull-down Resistor | -30 | -70 | -200 | μA |
| VR | Power-on Reset Voltage Threshold | Power-on Reset Voltage Threshold | Power-on Reset Voltage Threshold | 2.4 | 2.6 | 2.8 | V |
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