Raspberry Pi CM4 TV Stick

Raspberry Pi CM4 that plugs directly to TV/monitor

Availability

Raspberry Pi CM4 TV Stick is now available at Makerfabs

Specs

• Compatible with Raspberry Pi CM4 eMMC and no-eMMC
• HDMI plug
• Micro SD card connector
• USB-C connector for data/power
• Two USB2.0 USB-A connectors
• USB2.0 as solder pads on reverse side
• IR receiver
• User button
• USB multiplexer selector switch: enable 2xUSB-A ports or CM4 USB device mode
• Power and Act LEDs
• 14 GPIOs, as well as GND, 5V and 3.3V solder pads on reverse side of PCB for hacking
• Connector for Ambilight-like lightning with WS2812 or WS2801 LEDs (GND, GPIO18, GPIO10 and GPIO11)

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Description

HDMI plug

The board has HDMI Type A plug and routed to CM4 HDMI0 port

Micro SD card connector

Micro SD card connector accepts Micro SD card.

Important: don't insert SD card if using CM4 with eMMC, as SD card and/or CM4 can be permanently damaged (eMMC and SD card connector are sharing same SoC pins)

USB-C connector

USB-C connector is used to provide power to TV Stick. Consider using Raspberry Pi 4 power adapter or known good power supply for Raspberry Pi 4

USB-C connector also has USB2.0 data lines multiplexed with USB-A connectors

USB2.0 USB-A connectors

CM4 has built-in USB2.0 controller which can work as USB host or USB device. Slide switch, marked with A←USB→C on a back side of the boards configures CM4 USB controller and multiplexes USB data lines:

• When in A position: USB controller is switched to host mode and data lines are connected to USB2.0 switch IC and USB-A connectors are active
• When in C position: USB controller is switched to device mode and data lines are connected to USB-C connector. This mode can be used to flash CM4 eMMC or firmware

Latest Raspberry Pi OS builds have needed configuration line in config.txt

IR receiver

IR receiver is connected to CM4 GPIO17. To enable IR receiver following line has to added to config.txt file: dtoverlay=gpio-ir,gpio_pin=17

This article describes further remote pairing/learning (omit parts describing IR TX and make sure to still use 'dtoverlay=gpio-ir,gpio_pin=17')

User button

User button is connected to GPIO14. When used, has to be configured as active low, input pull-up

Use scenarios:

• OS shutdown. To enable OS shutdown, add following line to config.txt: dtoverlay=gpio-shutdown,gpio_pin=14
• This button also tied to nRPIBOOT: hold on power on to enter USB MSD mode for eMMC programming/fw update. USB slide switch has to be in 'C' position