Programming

Here you will find the details needed for develop your own firmware for the device

If you are interested in writing firmware for the VALTRACK-V4-VTS device, you will need to know where is each pin of MCU is connected to.

Since the schematics of the device is not yet openly available, We are providing the MCU pin connection details, which should be able to help you in determining how is the whole architecture laid out. Watching our device intro video would also help to get an overall idea on the hardware present on board.

MCU Pinout Details

Pin Number

Pin Name

Net Name

Connected to

1

VBAT

3VDC

3VDC

2

PC14-OSC32_IN

CLK_IN

32.768 KHz crystal

3

PC15-OSC32_OUT

CLK_OUT

32K.768 KHz crystal

4

PH3-BOOT0

BOOT0

BOOT0 pull down resistor

5

PB8

NET_LED_R

Network - RED LED - Cathode pin

6

PB9

NET_LED_G

Network - GREEN LED - Cathode pin

7

NRST

RESET

Debug connector MCU Reset lines via RC network

  • J60 pin no 1

  • J56 pin no 6

8

VDDA

3VDC

3VDC

9

PA0

SIM_PWRKEY_3V3

SIM7600x PWRKEY pin through N channel MOSFET.

  • Making this pin HIGH pulls PWRKEY pin to GND

10

PA1

DTR_3V3

SIM7600x DTR input pin through level translator.

11

PA2 / LPUART1_TX

LPUART1_TX

SIM7600x RXD input pin through level translator.

12

PA3 / LPUART1_RX

LPUART1_RX

SIM7600x TXD output pin through level translator.

13

PA4

ANALOG_IN

VCHG input through voltage divider resistor network.

  • R22,R33 govern the voltage at this pin.

  • Default values : R22 = 100K, R33 = 23.7K, effectively giving 2.87V for VCHG = 15V

14

PA5

GEN_LED_B

Location - BLUE LED - Cathode pin

15

PA6

NET_LED_B

Network - BLUE LED - Cathode pin

16

PA7

BAT_LED_R

Battery - RED LED - Cathode pin

17

PA8

RELAY

RELAY MOSFET driver Gate Input

  • Open drain driver with Drain pin of MOSFET exposed on a connector

18

PA9 / USART1_TX

UART_TX1

SE868K3AL RX0 input pin

19

PB2

GEN_LED_G

Location - GREEN LED - Cathode pin

20

VDD

3VDC

3VDC

21

RF1

RF1

Bluetooth PCB antenna via matching network

22

VSSRF

GND

System Ground

23

VDDRF

3VDC

3VDC

24

OSC_OUT

OSC_OUT

32 MHz crystal

25

OSC_IN

OSC_IN

32 MHz crystal

26

AT0

ATO

Not connected

27

AT1

AT2

Not connected

28

PB0

INT1

INT1 interrupt output of LIS3DH Accelerometer

29

PB1

GPS_ENABLE

Enable input of power gating MOSFET for SE868K3AL GNSS module

  • Making this pin high provides 3VDC to SE868KAL module

30

PE4

RELAY1

Not connected

31

VFBSMPS

VFBSMPS

3VDC

32

VSSSMPS

GND

System Ground

33

VLXSMPS

VLXSMPS

3VDC

34

VDDSMPS

VDDSMPS

3VDC

35

VDD

3VDC

3VDC

36

PA10 / USART1_RX

UART1_RX1

SE868K3AL TX0 output pin

37

PA11

GSM_ENABLE

Enable input of power gating MOSFET for SIM7600x LTE module

  • Making this pin high provides ~4VDC to SIM7600x module

38

PA12

GEN_LED_R

Location - RED LED - Cathode pin

39

PA13 / JTMS_SWDIO

SWDIO

Debug connector SWDIO lines

  • J60 pin no 3

  • J56 pin no 8

40

VDDUSB

VDDUSB

3VDC

41

PA14 / JTMS_SWCLK

SWCLK

Debug connector SWDIO lines

  • J60 pin no 2

  • J56 pin no 7

42

PA15

SOS

Tactile switch input

  • Pulled up, filtered and Active LOW

43

PB3

BAT_LED_B

Battery - BLUE LED - Cathode pin

44

PB4

TPS_ENABLE

Enable input of switching regulator TPS54240

  • Making this pin high powers the system via VCHG connector.

Not connected by default as it will cause system into reset loop if no alternate backup battery power available

45

PB5

BAT_LED_G

Battery - BLUE LED - Cathode pin

46

PB6 / I2C1_SCL

IIC_CLK

I2C clock of LIS3DH Accelerometer and M24M01 EEPROM

47

PB7 / I2C1_SDA

IIC_DATA

I2C data of LIS3DH Accelerometer and M24M01 EEPROM

48

VDD

3VDC

3VDC

J60 - MCU Debug Connector [SMT pads] - Pinout Details

Pin Number

Pin Name

Connected to

1

RESET

MCU Reset pin

2

SWCLK

MCU SWCLK pin

3

SWDIO

MCU SWDIO pin

4

GND

System Ground

5

VCC

3VDC

J56 - Flex Debug Connector [0.5mm 10 pin FFC] - Pinout Details

Pin Number

Pin Name

Connected to

1

SIM_USB_DN

SIM7600x USB_DN pin

2

SIM_USB_DP

SIM7600x USB_DP pin

3

SIM_USB_VBUS

SIM7600x USB_VBUS pin

4

UART_RX1

  • SE868K3AL TX0 output pin

  • MCU USART1_RX pin

5

UART_TX1

  • SE868K3AL RX0 input pin

  • MCU USART1_TX pin

6

RESET

MCU Reset pin

7

SWCLK

MCU SWCLK pin

8

SWDIO

MCU SWDIO pin

9

GND

System Ground

10

VCC

3VDC

J57 - SIM7600x USB Connector [SMT pads] - Pinout Details

Pin Number

Pin Name

Connected to

1

SIM_USB_DN

SIM7600x USB_DN pin

2

SIM_USB_DP

SIM7600x USB_DP pin

3

SIM_USB_VBUS

SIM7600x USB_VBUS pin

4

UART_RX1

  • SE868K3AL TX0 output pin

  • MCU USART1_RX pin

5

UART_TX1

  • SE868K3AL RX0 input pin

  • MCU USART1_TX pin

J62 - VCHG Connector [SMT pads] - Pinout Details

Pin Number

Pin Name

Connected to

1

VCHG

VCHG input of system through FUSE and diode

  • 12VDC to 42VDC input

2

GND

System Ground

J41 - VBAT Connector [SMT pads] - Pinout Details

Pin Number

Pin Name

Connected to

1

VBAT

VBAT input of system or Backup battery input

  • 3.7V to 4.2V battery input

2

GND

System Ground

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