Matek Crossfire CRSF To SBUS Converter (2 Pc.)

Matek's Industry first CRSF to SBUS protocol converter adapter board. This allows you to convert any receiver that uses the Crossfire communication protocol to SBUS or vice versa.

Specifications

• Compatible with CRSF/SBUS protocol receiver.
• Support CRSF to SBUS, or SBUS to CRSF conversion
• Battery voltage(RxBt) telemetry over CRSF protocol
• CRSF to SBUS latency <7ms
• Rated voltage: 4~5.5V @5V pad,  0~36V @VBAT pad
• No 5V regulator built-in,  VBAT pad is just for battery voltage sensing.
• PCB size 15mm x 10mm,  0.6g
• 2pcs/package

LED status

• slow blinks: CRSF-SBUS board doesn’t receive CRSF or SBUS signal, e.g., receiver is not bound with transmitter, receiver is not connected to UART of CRSF-SBUS board.
• solid ON:  CRSF-SBUS board and receiver are working normally.

Includes

• 1 x CRSF-PWM-C
• 1 x low ESR capacitor
• 1 x Dupont 2.54 pins

 Wiring Diagram:

Firmware Update Instructions:

• Tool: Matek Configurator
• Firmwares: crsf_sbus_fw.zip
• Mar.19,2022,  v1.1.0:  Fixed a failsafe bug when CRSF-SBUS converter can’t get CRSF signal from receiver.

Upgrade CRSF-SBUS via A or B

A. USB-TTL modules,  such as CP210x,  FTDI

1. Wiring

• TX1  —  USB-TTL module RX
• RX1  —  USB-TTL module TX
• 5V  —  USB-TTL module 5V
• G  —  USB-TTL module GND

2. Bridge the jumper pad at bottom side with a drop of tin,  or bridge it with tips of tweezer when powering on.
3. Connect USB-TTL module to PC,
Blue LED on CRSF-SBUS board will blink fast,  it means CRSF-SBUS board is working in boot mode.
now you can remove the jumper or remove it after flashing.
4. Open Matek configurator,  Select COM port of USB-TTL, Baud rate 115200,  Click “Connect”
5. OpenFile “crsf_sbus_vx.x.x.bin”
6. Click “Upgrade”
7. After update, remove the jumper.

B. INAV/BF serial passthrough

1. Wiring

• TX1  —  FC any spare UART_RX
• RX1  —  FC any spare UART_TX
• 5V  —  FC 5V or 4V5
• G  —  FC GND

2. Bridge the jumper pad at bottom side with a drop of tin,  or bridge it with tips of tweezer when powering on.
3. Connect FC USB to PC
Blue LED on CRSF-SBUS board will blink fast,  it means CRSF-SBUS board is working in boot mode.
now you can remove the jumper or remove it after flashing.
4. open INAV/BF configurator, connect FC to configurator
5. click INAV/BF configurator “CLI” tab, type “serialpassthrough x 115200”,  x = UART number -1,  e.g. CRSF-SBUS board connect to FC UART4,  type “serialpassthrough 3 115200”.
6. Disconnect FC from configurator, make sure USB is still plugged in FC and LED on CRSF-SBUS board is still blinking fast.
7. Open Matek configurator,  Select COM port of Flight controler,  Baud rate 115200,  Click “Connect”
8. OpenFile “crsf_sbus_vx.x.x.bin”
9. Click “Upgrade”
10. After update, remove the jumper.