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UART

HT42B534 USB 2 UART Board

A simple USB to UART board. Designed with KiCad. Manufactured and tested.

Front Back

How to use

  1. Plug USB to your PC
  2. Wire VIO to either V33O(3.3V) or VDD(5V)
  3. Connect TX, RX & GND (optionally VIO) to other devices

The voltage of RX/TX should match VIO.

Bill of Materials

Reference, Value, Footprint, Datasheet, Product
"U1","HT42B534_8SOP","Package_SO:SOP-8_3.9x4.9mm_P1.27mm","https://www.holtek.com/documents/10179/116711/HT42B534-xv110.pdf","https://item.szlcsc.com/504007.html"
"C1","0.1uF","Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder","~"
"J1","USB_A","Connector_USB:USB_A_CNCTech_1001-011-01101_Horizontal","~","https://item.szlcsc.com/98530.html"
"R2","33","Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder","~"
"R1","33","Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder","~"
"C6","47pF","Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder","~"
"C7","47pF","Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder","~"
"C3","1uF","Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder","~"
"C2","0.1uF","Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder","~"
"C4","10uF","Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder","~"
"C5","0.1uF","Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder","~"
"R3","330","Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder","~"
"D1","LED","Diode_SMD:D_0603_1608Metric_Pad1.05x0.95mm_HandSolder","~"
"J3","Conn_01x03","Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical","~"
"J2","Conn_01x04","Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Horizontal","~"

USB Device Info

lsusb output:

$ lsusb
Bus 000 Device 001: ID 04d9:b534 Holtek Semiconductor, Inc. USB TO UART BRIDGE  Serial: 0000

System Information:

USB TO UART BRIDGE:

  Product ID:   0xb534
  Vendor ID:    0x04d9  (Holtek Semiconductor, Inc.)
  Version:  2.10
  Serial Number:    0000
  Speed:    Up to 12 Mb/s
  Manufacturer: HOLTEK
  Location ID:  0x00142000 / 12
  Current Available (mA):   500
  Current Required (mA):    100
  Extra Operating Current (mA): 0