CH340B

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

• 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.

• 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)