Internal Devices Tiger City IMX Industrial Computer with Linux OS Internal expansion connector Watchdog + reset EEPROM‎‎ FLASH RTC ESP32 microcontroller TPM 2.0 Secure element TO136 Buzzer Internal expansion connector Part number: FH1234-221CWG0MUT01 Internal expansion connector connections diagram Internal expansion connector connections table Connector pin Description 1 GND 2 VIN 3 GND 4 SPI1 MOSI 5 GND 6 SPI1 SCLK 7 GND 8 SPI1 MISO 9 GND 10 RTC battery power supply 11 External watchdog reset 12 NC 13 GND 14 NC 15 NC 16 NC 17 GPIO4 IO25 18 GND 19 GPIO1 IO07 20 GPIO4 IO21 21 GPIO5 IO09 22 Global reset 23 GND 24 I2C3 SDA 25 I2C3 SCL 26 GND 27 +3V3 28 GND 29 USB3 positive pole 30 USB3 negative pole 31 GND 32 +20V 33 UIO reset 34 NC 35 NC 36 +1V8 37 +1V8 38 GND 39 +5V 40 +5V 41 GND 42 GND 43 VIN 44 GND Watchdog + reset The device is equipped with a watchdog and a reset circuit. Watchdog and reset circuit connections diagram CPU connections table Signal Default function User-space name  ESP32_WDI GPIO1_IO01 gpiochip0 1 ESP32_WDI SOM_GLOB_NRST GPIO5_IO02 gpiochip4 2 GLOBAL_NRST GPIO0 GPIO3_IO22 gpiochip2 22 ESP_GPIO0 GPIO2 GPIO3_IO20 gpiochip2 20 ESP_GPIO2 ESP_CHIP_PU GPIO4_IO20 gpiochip3 20 ESP_CHIP_PU ESP32 reset The device is equipped with an ESP32 microcontroller as a watchdog. EEPROM‎‎ The device is equipped with 2 EEPROM memory modules. EEPROM B is read-only and reserved for the producer's purposes. EEPROM device Part number: M24C02-RMC6 EEPROM A connections table EEPROM pin Description User-space name 1 Address pin 0 (GND) X 2 Address pin 1 (+3V3) X 3 Address pin 2 (+3V3) X 5 I2C2 data X 6 I2C2 clock X 7 EEPROM write-protect gpiochip0 2 EEPROM B (EEPROM SN) connections table EEPROM pin Description User-space name 1 Address pin 0 (GND) X 2 Address pin 1 (+3V3) X 3 Address pin 2 (GND) X 5 I2C2 data X 6 I2C2 clock X 7 EEPROM write-protect (pull-up) X EEPROM connection diagram User-space access EEPROM device name:  /sys/bus/nvmem/devices/1-00561 EEPROM device address: 0x56 I2C2 EEPROMs A and B are connected to the CPU with the I2C2 interface. FLASH Part number: W25Q64JVSSIQ FLASH connections table FLASH pin Description User-space name 1 SPI1_CS0 gpiochip2 21 2 SPI1_MISO X 3 SPI1_WP X 5 SPI1_MOSI X 6 SPI1_SCLK X 7 SPI1_HOLD X FLASH connection diagram User-space access FLASH device name: /dev/mtdblock0 SPI1 FLASH is connected to the CPU with the SPI1 interface. RTC The device is equipped with a real-time clock operating at 32.768 kHz with a tolerance of 20 ppm. The RTC clock is connected to a DR2032 battery which serves as its power supply. RTC device Part number: DS1338 RTC connection diagram User-space access Device name: /sys/class/rtc/rtc0 Device address: 0x68 RTC connections table RTC pin Description 1 Clock oscillator pin no. 1 2 Clock oscillator pin no. 2 3 Battery power pin 5 I2C3 data 6 I2C3 clock I2C3 The real-time clock is connected to the CPU with the I2C3 interface. ESP32 microcontroller The device is equipped with an internal ESP32 microcontroller that can be used for internal purposes. ESP32 device Part number: ESP32-DOWD ESP32 connections table ESP32 pin Description 8 ESP_P_DETECT 9 ESP_CHIP_PU 14 ESP32_WDT_EN 15 ESP32_WDI 22 ESP_GPIO2 23 ESP_GPIO0 24 RESET_WDT 25 LED_ESP 26 VDD_SDIO 28 ESP_SPI_HD 29 ESP_SPI_WP 30 ESP_SPI_CS0 31 ESP_SPI_CLK 32 ESP_SPI_Q 33 ESP_SPI_D 38 I2C4_SCL 39 I2C4_SDA 40 ESP_CONSOLE_RX 41 ESP_CONSOLE_TX ESP32 connections diagram CPU connections table Signal CPU pin Default function User-space name ESP_GPIO_0 AC14 GPIO3_IO22 gpiochip2 22 ESP_GPIO_2 AC15 GPIO3_IO20 gpiochip2 20 ESP32_WDI AF14 GPIO1_IO01 gpiochip0 1 ESP32_WDT_EN AF13 GPIO1_IO03 gpiochip0 3 I2C4 The microcontroller is connected to the CPU via the I2C4 interface. UART3 The microcontroller is connected to the CPU via the UART3 interface. TPM 2.0 The device is equipped with a trusted platform module in 2.0 standard. TPM device Part number: SLM9670 TPM connections table TPM pin Description 17 Reset 18 TPM_IRQ 19 SPI2 clock 20 SPI2 chip select 0 21 SPI2 master out slave in 24 SPI2 master in slave out User-space access Device name: /sys/class/tpm TPM connection diagram CPU connections table Signal CPU pin Default function User-space name TPM_IRQ AC24 GPIO4_IO23 gpiochip3 23 SPI2_CS0_TPM A6 GPIO5_IO13 gpiochip4 13 SPI2 The trusted platform module is connected to the CPU with the SPI2 interface. Secure element TO136 The device is equipped with a secure element that can be used for data encoding. Secure element device Part number: IDEMIA TO136 Secure element connections table Secure element pin Description 1 I2C4 clock 2 I2C4 data 3 +3V3 6 IDLE/BUSY state report User-space access Device address: 0x50 Secure element connections diagram Expander E The secure element is connected to the Expander E connected to the CPU via the I2C3 interface. I2C4 The secure element is connected to the CPU via the I2C4 interface. Buzzer The device is equipped with a buzzer. Buzzer device Part number: LD-BZEG-0905 User-space access Device name:  gpiochip3 7 Label: "BUZZER" Buzzer connection diagram