40-Pin Rpi-Gpio-Header; Debug Interface; Fan Connector; Functional Earth Connection - Kontron BL Pi-Tron CM3+ User Manual

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BL Pi-Tron CM3+ - Rev. 1.1

3.1.14. 40-pin RPI-GPIO-Header

The intended 40-pin header can be used just like the header on the Raspberry Pi 3+, e.g. as GPIO or as an RGB

interface, see Figure 5 (pos. 14). The header also contains some of the other interfaces, e.g. the debug interface. If

this is used in the header, it cannot be used in the USB connector at the same time. In the standard version, the

header is not fitted.

For the pin assignment of the 40-pin RPI-GPIO-Header, refer to Chapter 3.2.13 40-pin RPI-GPIO-Header (X800).

There is a debug interface using UART protocol with a Mini-B USB connector, see Figure 5 (pos. 15). The Debug

interface is for service and should only be used by qualified personnel.

An additional adapter is needed to translate the 3.3 V UART signals (provided on the Mini-B USB connector) to USB.

The debug interface is for service purpose and should only be used by qualified personnel.

For the pin assignment of the debug connector, refer to Chapter 3.2.14 USB Debug Connector (X401).

There is a fan connector to control a 5 V fan via GPIO 12 (PWM), see Figure 5 (pos. 16). For the pin assignment of the

fan connector, refer to Chapter 3.2.15 Fan Connector (X1200).

The GND pin of the power connector is connected to functional earth of the electronics and to the four mounting

holes on the edges of the circuit board.

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