Mainboard

This is the largest PCB in the Pyra, with a wide range of different functions. It could be compared to the motherboard in a traditional desktop computer, with the addition of a keyboard and gaming controls on one side. Display-support hardware (the Displayboard) and the processor itself (see CPU-Board) are each on separate PCBs.

The Mainboard includes the following hardware:

Modem

Main Article: Modem

There is a space for an optional WWAN&GPS module. This will be populated with various Pin-compatible Modules designed for different Regions, or not at all, depending on which Pyra Model you buy.

GPS Hardware:

Infineon BGM1034N7 - GPS and GLONASS Front-End Module, a low-noise filter and pre-ampliflier (LNA)
The actual GPS/GLONASS receiver is part of the modem chip.

Rumble

Haptic feedback is provided through vibration generated by an electric Motor with an unbalanced mass on its Driveshaft. [1]

Hardware:

Precision Micro 304-106 - 5mm x 7mm vibration motor, 3V @ 37.5mA, 9500rpm, 0.6g amplitude

Storage

Main Article: Storage

The Mainboard includes a combination microSD/SIM card slot which, with the addition of a microSD card, can be used for internal storage up to 200GB. With the addition of two accessible regular-sized SD card slots (each capable of up to 512GB storage), that's 1.2 TB of removable storage.

Connectivity

The Pyra connects to WWAN&GPS, WiFi and Bluetooth from Modules on the Mainboard.

I²C connectivity

The Pyra mainboard contains several I²C busses. 4 of them travel through the mainboard and are accessible from them.

The following devices are connected to I²C.

SYSTEM	SMBus, I/O Expander	LED Driver	Audio Sense
	TCA6424ARGJ	IS31FL3199	TS3A227ERVAR

SENSOR	Gyroscope	Compass, Accellerometer	Barometer, Thermometer, Hygrometer (only 4G)
	BMG160	BMC150	BME280

PERIPHERAL	Hall Effect Sensor (Left joystick)	Hall Effect Sensor (Right joystick)	Battery charger	Modem current sensor (Only 4G)
	AS5013	AS5013	BQ24297RGE	INA231YFF

PANEL	Touch screen controller	LED Driver
	TSC2007IPW	IS31FL3196