Matek

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CRSF-PWM Converter, CRSF-PWM-C

Compatible with CRSF protocol receiver only
Support any CRSF protocol receivers (including 433MHz, 868MHz, 915MHz, 2.4GHz)
10x PWM outputs
PWM frequency configurable (50Hz default, 100,160,330, 400Hz)
2x UARTs (for Receiver and GPS)
Telemetry ID: RxBt, Curr, Capa, Bat%, GPS, GSpd, Hdg, Alt, Sats
36V Max. battery voltage sense (1K:10K voltage divider built-in)
Current sensor built-in (90A continuous /220A Peak), current scale = 150 by default
Vbat and Current sensor scale configurable
Failsafe value auto set
Firmware upgradeable
Rated voltage: 4~9V @5V pad, 0~36V @BAT+
No 5V regulator built-in, Servos must be powered via 5V pad by external 5V source.
26mm x 26mm, 2.8g
Packing: 1x CRSF-PWM-C, 1x low ESR capacitor, Dupont 2.54 pins

Pinouts and Pads

Tx1/Rx1(UART1) for CRSF protocol Receiver
Tx2/Rx2(UART2) for GPS/firmware update/setting parameters
1~10: CH1~CH10 PWM outputs
Curr: current sensor signal (0~3.3V)
Vbat(CRSF-PWM-6 and -C ): (0~36V) Battery voltage sensing
Vbat(CRSF-PWM-B) ): (6~30V) Battery voltage sensing and power supply of onboard BEC
G: ground
4v5 pad voltage = 5V pad voltage -0.3V, make sure the voltage on 5V pad is not higher than receiver and GPS rated voltage.

Failsafe (FW 1.1.1 or older)

Failsafe value is set automatically after CRSF-PWM board is powered on and receive CRSF signal. LED blinks 8 times quickly.
Failsafe value = The PWM value of each channel(except CH3) when CRSF signal is received by CRSF-PWM board for the first time
CH3 is specially arranged for the throttle, Failsafe value = 988 by default.
Usually put the Throttle joystick to the lowest point, put AIL(Roll), ELE(Pitch), RUD(Yaw) middle before powering on receiver.

Failsafe (FW 2.0.0 or newer)

CH3 is arranged for the throttle, Failsafe value = 988 by default. you can change the failsafe value of CH3 and other channels by following settings.
Make sure ESC signal is disconnected from CRSF-PWM board before starting failsafe settings
Bridge PWM1 and PWM2 signal pad, then power on CRSF-PWM board and receiver.
Failsafe value will be saved automatically after CRSF-PWM board is powered on and receive CRSF signal. LED blinks 8 times quickly.
Failsafe value = The PWM value of each transmitter channel when CRSF signal is received by CRSF-PWM board.
Remove the jumper between PWM 1 and 2, then CRSF-PWM board will work in normal PWM output mode.

LED status

Slow blinks: CRSF-PWM board doesn’t receive CRSF signal, e.g., receiver is not bound with transmitter, receiver is not connected to UART1 of CRSF-PWM board.
8x quick blinks: CRSF-PWM board received CRSF signal and failsafe value is saved. (firmware 1.1.1 or older)
Solid ON: CRSF-PWM board and receiver are working normally
2x slow blinks between 8x fast blink and solid on: CLI mode is active (firmware 1.1.1 or older)

GPS telemetry

Compatible with GPS NMEA protocol, 1Hz, Baud 9600~115200
GPS “TX” to CRSF-PWM board “RX” Single wire half duplex UART connection, CRSF-PWM board “TX” to GPS “RX” is not essential.
Support GPS Telemetry ID: GPS, GSpd, Hdg, Alt, Sats
u-blox series GPS can output “0+1 – UBX+NMEA” protocol by default
Sensors(GPS, GSpd, Hdg, Alt, Sats) will blink in Transmitter TELEMETRY tab once CRSF-PWM board has connection with GPS.
Troubleshooting for no GPS telemetry, double check the wiring between GPS and CRSF-PWM board, some u-blox GPS may don’t output NMEA protcol, you need to revert GPS to default configuration in u-center.
with OpenTX Telemetry Logging, You can plot your flight path or search the lost plane.

VSpd telemetry (Vario)

VSpd telemetry is supported by ExpressLRS 2.0, EDGE 2.6, OPENTX 2.2 or newer.
Support barometer MS5611(I2C address 0x77) and SPL06-001 (I2C address 0x76)

TIM & PWM Frequency

PWM frequency on all 10x Channels can be configured according to TIM
PWM run at 50Hz by default
TIM2: CH1, CH2, CH4
TIM16: CH3
TIM3: CH5, CH6, CH7, CH8
TIM1: CH9, CH10

CLI mode

If CRSF-PWM board doesn’t detect GPS connected to UART2 within 10 seconds after powering on, CLI mode will active.
After CLI mode is active, CRSF-PWM board can be connected to configurator via USB-TTL module/FC passthrough.
In CLI mode, CRSF-PWM board firmware can be updated
CLI mode has no effect to receiver CRSF signal and PWM outputs

Additional Information

CLI Mode and Parameters

Firmware updates

SKU	CRSF-PWM-6	CRSF-PWM-C	CRSF-PWM-B	CRSF-PWM-V10	CRSF-PWM-V ELRS-R24-V
RF Frequency	compatible with any CRSF protocol receivers (including 433MHz, 868MHz, 915MHz, 2.4GHz)
PWM outputs	6	10	8	10	7
CH remapping	set output_5 = ch11 or ch12
PWM frequency	50, 100, 160, 330, 400Hz
Telemetry ID	RSSI, Qly SNR, RxBt, Curr, Capa, Bat%, GPS, GSpd, Hdg, Alt, Sats, VSpd, Baro Alt
Vbat pad	0~36V	0~36V	6~30V	0~36V	0~36V
Current sensor	external	90A/220A	external	external	external
BEC	external	external	5V/6V 5A	external	external
Barometer	external	external	external	SPL06-001	SPL06-001
PCB Size(mm)	25*16	26*26	33*21	27*16	38*16

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