# Internal Devices ## {{@273#bkmrk-tiger-city-imx-embed}} - [{{@166#bkmrk-internal-expansion-c}}](https://doc.redisage.com/link/166#bkmrk-internal-expansion-c) - [{{@166#bkmrk-watchdog-%2B-reset}}](https://doc.redisage.com/link/166#bkmrk-watchdog-%2B-reset) - [{{@166#bkmrk-eeprom%E2%80%8E%E2%80%8E}}](https://doc.redisage.com/link/166#bkmrk-eeprom%E2%80%8E%E2%80%8E) - [{{@166#bkmrk-flash}}](https://doc.redisage.com/link/166#bkmrk-flash) - [{{@166#bkmrk-rtc}}](https://doc.redisage.com/link/166#bkmrk-rtc) - [{{@166#bkmrk-esp32-microcontrolle}}](https://doc.redisage.com/link/166#bkmrk-esp32-microcontrolle) - [{{@166#bkmrk-tpm-2.0}}](https://doc.redisage.com/link/166#bkmrk-tpm-2.0) - [{{@166#bkmrk-secure-element-to136}}](https://doc.redisage.com/link/166#bkmrk-secure-element-to136) - [{{@166#bkmrk-buzzer}}](https://doc.redisage.com/link/166#bkmrk-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** [![625c3c1e-7881-4030-9874-e9a294456278.png](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/625c3c1e-7881-4030-9874-e9a294456278.png)](https://doc.redisage.com/uploads/images/gallery/2024-04/625c3c1e-7881-4030-9874-e9a294456278.png) #### 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** #### [{{@134#bkmrk-i2c3}}](https://doc.redisage.com/link/134#bkmrk-i2c3) EEPROMs A and B are connected to the CPU with the I2C2 interface. ### FLASH Part number: **W25Q64JVSSIQ** [![image.png](https://doc.redisage.com/uploads/images/gallery/2024-07/scaled-1680-/image.png)](https://doc.redisage.com/uploads/images/gallery/2024-07/image.png) #### 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** #### [{{@134#bkmrk-spi1}}](https://doc.redisage.com/link/134#bkmrk-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
#### [{{@134#bkmrk-i2c4}}](https://doc.redisage.com/link/134#bkmrk-i2c4) 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** [![a7b3a58b-200b-44dc-8468-bd39bc498805.png](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/a7b3a58b-200b-44dc-8468-bd39bc498805.png)](https://doc.redisage.com/uploads/images/gallery/2024-04/a7b3a58b-200b-44dc-8468-bd39bc498805.png) #### 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 AC14GPIO3\_IO22gpiochip2 22
ESP\_GPIO\_2AC15GPIO3\_IO20gpiochip2 20
ESP32\_WDI AF14GPIO1\_IO01gpiochip0 1
ESP32\_WDT\_EN AF13 GPIO1\_IO03 gpiochip0 3
#### [{{@134#bkmrk-i2c4-1}}](https://doc.redisage.com/link/134#bkmrk-i2c4-1) The microcontroller is connected to the CPU via the I2C4 interface. #### [{{@134#bkmrk-uart3-1}}](https://doc.redisage.com/link/134#bkmrk-uart3-1) 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** [![579d062d-a70c-4778-a1bd-8d52a8a756ff.png](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/579d062d-a70c-4778-a1bd-8d52a8a756ff.png)](https://doc.redisage.com/uploads/images/gallery/2024-04/579d062d-a70c-4778-a1bd-8d52a8a756ff.png) #### 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
#### [{{@134#bkmrk-%C2%A0}}](https://doc.redisage.com/link/134#bkmrk-%C2%A0) 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** **[![0e30de29-719d-44cf-bec2-d4451bfabdb8.png](https://doc.redisage.com/uploads/images/gallery/2024-04/scaled-1680-/0e30de29-719d-44cf-bec2-d4451bfabdb8.png)](https://doc.redisage.com/uploads/images/gallery/2024-04/0e30de29-719d-44cf-bec2-d4451bfabdb8.png)** #### 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
#### [{{@136#bkmrk-expander-e}}](https://doc.redisage.com/link/136#bkmrk-expander-e) The secure element is connected to the Expander E connected to the CPU via the I2C3 interface. #### [{{@134#bkmrk-i2c4-1}}](https://doc.redisage.com/link/134#bkmrk-i2c4-1) 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