Matek CRSF to PWM CRSF-PWM-C signal converter for 10 channels

The Matek CRSF-PWM-C 10-channel converter/converter is designed to accept CRSF signal (Crossfire protocol) and allows the connection of 10 PWM devices (e.g. servos, ESC). In addition, the converter has a customizable PWM frequency output, a built-in 90A current sensor and a Failsafe function. The values of the on-board current sensor are included in the CRSF telemetry and sent to the connected transmitter. There are also two UARTs on the board for connecting a receiver and a GPS (NMEA output) which then sends the coordinates along with the Crossfire telemetry. The board does NOT include a 5V BEC, so it is designed to be powered from a 5V source (such as an ESC or external BEC).

Note: the image shows soldered pins, but the converter is shipped soldered out

• Compatibility: CRSF protocol receivers only
• Supports any CRSF protocol receiver (including 433MHz, 868MHz, 915MHz, 2.4GHz)
• Built-in current sensor
• Customizable Current Sensor Scale and Vbat
• Automatic Failsafe value setting
• Upgradeable firmware
• No built-in BEC

• Number of PWM outputs: 1-
• Customizable PWM frequency: 50/100/160/330/400Hz (default 50Hz)
• UARTs ports: 2 (for receiver and GPS)
• Telemetry IDs: RxBt, Curr, Capa, Bat%, GPS, GSpd, Hdg, Alt, Sats
• Max. battery voltage sensor: 36V (built-in 1K:10K voltage divider)
• Current Sensor: 90A continuous / 220A peak, current scale = 150 by default
• Rated voltage:
  • 4 ~ 9V at 5V
  • 0 ~ 36V at BAT+
• Built-in BEC: no
• Dimensions: 26 x 26
• Weight: 2.8g

• 1 x Matek CRSF-PWM-C converter
• 1 x Dupont 2.54 contacts
• 1 x low ESR capacitor

Pin designation:

• Tx1 / Rx1 (UART1) for CRSF protocol receiver
• Tx2 / Rx2 (UART2) for GPS / firmware update / parameter setting
• 1 ~ 10: CH1 ~ CH10 PWM outputs
• Vbat: battery voltage detection (0 ~ 36V)
• G: ground
• 4v5 pin voltage = 5V pin voltage -0.3V, make sure the 5V pin voltage does not exceed the rated voltage of the receiver and GPS.

Failsafe:

• The Failsafe value is set automatically after the CRSF-PWM board is turned on and a CRSF signal is received. The LED flashes rapidly 8 times.
• Failsafe value = the PWM value of each channel (except CH3) when the CRSF signal is received by the CRSF-PWM board for the first time
• CH3 is specifically located for throttle, Failsafe value = 988 by default.
• Before turning on the receiver, put the Throttle position on the joystick to the lowest point, and put AIL (Roll), ELE (Pitch), RUD (Yaw) in the middle

LED indication:

• LED blinking slowly: the CRSF-PWM board is not receiving the CRSF signal, e.g., the receiver is not connected to the transmitter, the receiver is not connected to UART1 of the CRSF-PWM board
• Rapid flashing 8 times: The CRSF-PWM board has received the CRSF signal and the Failsafe value is saved.
• Solid: CRSF-PWM board and receiver are operating normally.
• 2 times slow flashing between 8 times fast flashing and steady light: command line mode is active

GPS telemetry:

• Compatible with GPS NMEA protocol
• Connection of the GPS "TX" pin to the CRSF-PWM "RX" pin via a single-wire half-duplex UART connection. Connection of the CRSF-PWM "TX" pin to the GPS "RX" pin is not necessary.
• GPS telemetry identifier support: GPS, GSpd, Hdg, Alt, Sats
• GPS u-blox series can output "0 + 1 - UBX + NMEA" protocol by default
• The sensors (GPS, GSpd, Hdg, Alt, Sats) will flash on the transmitter's TELEMETRY tab once the CRSF-PWM converter has established a connection to GPS
• To troubleshoot when GPS telemetry is not present, double check the wiring between the GPS and the CRSF-PWM converter, some u-blox GPS may not output NMEA protocol, you will need to reset the GPS to the default configuration in u-center
• With OpenTX Telemetry Logging, you can plot a flight route or find a lost airplane

TIM and PWM frequency:

• The PWM frequency on all 10 channels can be adjusted to match the TIM frequency
• PWM operates at the default frequency of 50Hz
• TIM2: CH1, CH2, CH4
• TIM16: CH3
• TIM3: CH5, CH6, CH7, CH8
• TIM1: CH9, CH10

Command Line Mode (CLI mode):

• If the CRSF-PWM board does not detect a GPS connected to UART2 within 10 seconds of power-up, the command line mode is activated
• After activating CLI mode, the CRSF-PWM board can be connected to the configurator via USB-TTL / FC pass-through module.
• In CLI mode, the CRSF-PWM board firmware can be updated.
• CLI mode does not affect the CRSF receiver signal and PWM outputs