Internal Devices

Tiger City IMX Industrial Computer with Linux OS

Internal expansion connectors

Internal Expansion Connector A

Part number: FH1243-208CWG0MUT01

Internal expansion connector connections diagram

Internal expansion connector connections table

Connector pin	Description
1	VIN
2	+20V
4	+5V
5	+3V3
10	+1V8
11	+1V8
12	+3V3
13	+5V
15	+20V
16	VIN

Internal Expansion Connector B

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	CPU pin	Default function	User space name
ESP32 watchdog refresh	(...)	GPIO1_IO3	gpiochip0 3
ESP32 watchdog reset	(...)	GPIO1_IO01	gpiochip0 1
Reset	(...)	GPIO5_IO02	gpiochip4 2

ESP32 reset

The device is equipped with an ESP32 microcontroller, which can optionally serve as a watchdog.

EEPROM‎‎

The device is equipped with 2 EEPROM memory modules. EEPROM B is reserved for the producers pruposes and it is read only.

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	I2C3 data	X
6	I2C3 clock	X
7	EEPROM write protect	gpiochip5 6

EEPROM connection diagram

User space access

EEPROM A device name: /sys/bus/nvmem/devices/2-00522

EEPROM B device name: /sys/bus/nvmem/devices/2-00561

EEPROM B connections table

EEPROM pin	Description
1	Address pin 0 (GND)
2	Address pin 1 (+3V3)
3	Address pin 2 (GND)
5	I2C3 data
6	I2C3 clock
7	EEPROM write protect

Expander E

EEPROM A is connected to the expander E via I2C4 interface.

I2C2

EEPROMs A and B are connected to the CPU with I2C3 interface.

RTC

The device is equipped with a real-time clock operating at frequency of 32.768 kHz and tolerance of 20 ppm. The RTC clock is connected to a DR2032 battery which acts as its power supply.

RTC device

Part number: DS1338

RTC connection diagram

User space access

Device name: /sys/class/rtc/rtc0

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

I2C2

Real-time clock is connected to the CPU with I2C3 interface.

ESP32 microcontroller

The device is equipped with an internal ESP32 microcontroller, used for internal purposes.

ESP32 device

Part number: ESP32-DOWD

ESP32 connections table

ESP32 pin	Description
8	ESP_P_Detect
9	ESP32 reset
14	DSI-HDMI bridge I2C data
15	DSI-HDMI bridge I2C clock
16	DSI_HDMI bridge interrupt
20	I2C3 data
22	I2C3 clock
23	ESP_GPIO0
24	ESP32 watchdog reset
25	ESP32 watchdog refresh
26	VDD_SDIO
28	ESP SPI hold
29	ESP SPI write protect
30	ESP SPI chip select
31	ESP SPI clock
32	ESP SPI slave out
33	ESP SPI slave in
34	ESP LED
39	ESP programming on signal
40	ESP console RX
41	ESP console TX

ESP32 connections diagram

CPU connections table

Signal	CPU pin	Default function	User space name
ESP programming on signal	AG11	GPIO1_IO06	gpiochip0 6
ESP32 reset signal	E18	GPIO5_IO26	gpiochip4 26
ESP GPIO 0	D18	GPIO5_IO27	gpiochip4 27
ESP Watchdog line	AG8	GPIO4_IO28	gpiochip3 28