Librem 5 Phone – Birch¶
The sections on this page contain information about the Birch revision of the Librem 5 phone.
Quick Start Guide¶
The version of the Quick Start Guide included with the phone can be downloaded: Librem5-Quick-Start-1.0.3.pdf
Components¶
System on Chip and Peripherals¶
- Customer grade i.MX 8M Quad [datasheet] and [reference manual]
- Four ARM Cortex-A53 cores.
- One Cortex-M4.
- Vivante GC7000Lite graphics
- 1 ⨉ Gigabit Ethernet
- 32 GB eMMC
- 3GB RAM
- SPI NOR Flash
- Real Time Clock (RTC)
Audio¶
- Wolfson Media WM8962
- Headphones and external microphone via CTIA-configured 3.5mm jack
- Loudspeaker
Battery¶
- Texas Instruments BQ25895 battery charge controller [datasheet]
Bluetooth, Wi-Fi, WWAN¶
- Bluetooth I2S interface
- Bluetooth (SDIO)
- RedPine WiFi/BT M.2 module on SDIO
- Broadmobi BM818-E1 or BM818-A1 WWAN module
GNSS¶
- Teseo-LIV3F multiconstellation GNSS receiver (UART2 interface and antenna)
Hardware Kill Switches¶
- Diodes Incorporated Power Switch [datasheet]
- WWAN (Modem)
- WiFi/Bluetooth
- Microphone and Camera
LEDs¶
- Used for indicating charging status
nano-SIM and microSD Cards¶
- Combined microSD and nano-SIM slot
Push Buttons¶
- Power
- Volume up
- Volume down
Sensors and Motors¶
- Haptic motor
- ST LSM9DS1 accelerometer, gyro, magnetometer [datasheet]
- Vishay VCML4040 proximity and ambient light sensor [datasheet]
Test Points¶
The 15 test points for UART1, UART2, JTAG, and the BOOT_MODE0/1 pins can be found below the WLAN module on the rear of the phone, as shown with the rear cover removed.
See a larger version of this image
The USB test points are located in the recessed area above the battery compartment.
USB¶
- Serial Downloader support (loading u-boot via USB)
- USB-C port including USB-C role switching
- USB Hub and SD controller [datasheet]
Schematics¶
The following schematics are available:
- Librem 5 Birch main board:
librem5_birch_mainboard_schematic.pdf- Librem 5 Birch USB C board:
librem5_birch_usb-c_board_schematic.pdf
