trezor-firmware/core/docs/hardware.md

Trezor Core Hardware

Trezor Model T Open Source Hardware Reference Documentation

Photo

Photo of assembled board (top)

Photo of assembled board (bottom)

Photo of assembled TFT LCD display + capacitive touch panel module (top)

Photo of assembled TFT LCD display + capacitive touch panel module (bottom)

Photo of disassembled TFT LCD display + capacitive touch panel module (top) (CTPM on left) (TFT LCD broken glass removed)

Photo of disassembled TFT LCD display + capacitive touch panel module (bottom) (CTPM on left) (TFT LCD broken glass removed)

Bill of Materials / BOM

BOM

Schematic

Developer Kit

• 1 x STM32F429I-DISC1 (note: Manual with pin to dev board function mapping)
• 1 x USB Cable Type A Plug/Male to Type Mini-B Plug/Male
• 1 x USB Cable Type A Plug/Male to Type Micro-B Plug/Male
• 1 x ER-TFTM028-4 Display + Capacitive Touch Panel Module (Note: specify 40-Pin Header, 8080 8-bit Parallel, VDD=3.3V, Capacitive Touch Panel) (note: Manual)
• 1 x microSD Board
• 1 x Pack of 40 Female to female jumper wires with 0.1" header contacts

Display

• Resolution: 240px x 240px -OR- 240px x 320px
• Driver IC: ST7789V, GC9307, or ILI9341V (on-chip display data RAM of 240x320x18 bits)
• 18-bit (262,144) RGB color graphic type TFT-LCD
• Bus/Interface: 8080-I 8-bit parallel with 16-bit/pixel (RGB 5-6-5)

Pinout

Description	MCU Pin	Notes
LCD_RST	PC14	display module pin 21. benign conflict with unpopulated OSC32_IN on dev board.
LCD_FMARK	PD12	tearing effect input; display module pin 22
LCD_PWM	PA7	backlight control (brightness); display module pin 29. benign conflict with I2C_EXT_RST on dev board.
LCD_CS	PD7	display module pin 23
LCD_RS	PD11	register select aka command/data; display module pin 24
LCD_RD	PD4	display module pin 26
LCD_WR	PD5	display module pin 25
LCD_D0	PD14	display module pin 3
LCD_D1	PD15	display module pin 4
LCD_D2	PD0	display module pin 5
LCD_D3	PD1	display module pin 6
LCD_D4	PE7	display module pin 7
LCD_D5	PE8	display module pin 8
LCD_D6	PE9	display module pin 9
LCD_D7	PE10	display module pin 10
LCD_D8	PE11	not currently used

Capacitive Touch Panel / Sensor

• Bus/Interface: I2C
• Driver IC: FT6236 or FT6206
• single touch

Pinout

Description	MCU Pin	Notes
TOUCH_ON	PB10	no mapped pin on display module
I2C1_SCL	PB6	display module pin 30
I2C1_SDA	PB7	display module pin 31
EINT	PC4	not currently used. display module pin 39. conflict with USB OTG FS PSO on dev board.
REST	PC5	benign conflict with USB OTG FS OC on dev board. no mapped pin on display module.

microSD Socket

• Bus/Interface: 4-bit

Pinout

Description	MCU Pin
SDIO_D0	PC8
SDIO_D1	PC9
SDIO_D2	PC10
SDIO_D3	PC11
SDIO_CK	PC12
SDIO_CMD	PD2
SD_CARDDETECT	PC13
SD_ON	PC0

USB Socket

• USB HS (high-speed) peripheral in FS (full-speed) mode

Pinout

Description	MCU Pin	Notes
OTG_HS_VBUS	PB13
OTG_HS_ID	PB12
OTG_HS_DM	PB14
OTG_HS_DP	PB15
SBU1	PA2	not currently used. conflict with L3GD20 Gyroscope MEMS on dev board.
SBU2	PA3	not currently used

Dev Board

• STM32F429ZIT6
• HSE / High-Speed External Crystal: 8 MHz
• Integrated STMicroelectronics ST-LINK/V2.1 debugger

Note: There are many conflicts between how the software maps GPIO pins and how the dev board maps them to its functions. Many of the conflicts are resolved by removing the external SDRAM chip and the TFT LCD display + resistive touch panel that come attached to the dev board. The unresolved conflicts are noted in the pinout descriptions above. Currently, testing has shown that it is not necessary to remove either the SDRAM or the TFT LCD display + resistive touch panel. If you choose to remove them, our experience is that the easiest way to remove the SDRAM chip is by first cutting the leads on one side of the chip (e.g.- with an X-Acto knife) and then lifting the chip and rocking it until the leads on the other side break. Be sure that no broken leads short to another pin as this can cause the dev board and/or display to malfunction. If some do, just clean them up so that they are separate again. This method reduces the amount of knife work, and the chance for slicing other things on the board (or yourself). To remove the TFT LCD display + resistive touch panel module, lift the module away from the metal tray, bend the metal tray out of the way, then cleanly pull/tear the flex PCB away from the solder connections to the main board (the connections usually break without much force). The metal tray is attached to the board with double stick tape. You just have to pull that up.

Photo of dev board before modifications (top)

Photo of dev board before modifications (bottom)

Minimum MCU requirements:

• STM32F4 family STM32F427VIT6
• 168 MHz, 8 MHz HSE
• 2048 KB Flash memory
• 192 KB SRAM
• 64 KB CCMRAM
• FMC controller
• TRNG

Clock Tree