Connector Pinout - Including GPS Sensor Interface¶

The OpenIMU300ZI main connector is a SAMTEC FTM-110-02-F-DV-P defined below. The mating connector that pairs with the main connector is the SAMTEC CLM-110-02.

OpenIMU300ZI Interface Connector

J2 is 20-pin connector and it used for connecting the OpenIMU300ZI unit into Open IMU evaluation board. The connector pin definitions are defined in the table below. The GPS-related signals are noted.

Interface Connector Pin Definitions

Pin Main Function Alternative Function

1 GPIO ( IO3 ) Output by default

2

Synchronization Input

GPS 1PPS Input

3

User UART TX (Output)

(Serial Channel 0 )

SPI Clock (SCLK)

Input

4

User UART RX (Input)

(Serial Channel 0)

SPI Data (MISO)

Output

5

UART1 TX (Output)

(Serial Channel 1)

SPI Data (MOSI)

Input

6

UART1 RX (Input)

(Serial Channel 1)

SPI Chip Select (SS)

Input

7

SPI/UART Interface

Selector

Data Ready (SPI)

Active edge falling

8 External Reset (NRST))

9 GPIO ( IO2 )

Output by default

10 Power VIN (3-5 VDC) Power VIN (3-5 VDC)

11 Power VIN (3-5 VDC) Power VIN (3-5 VDC)

12 Power VIN (3-5 VDC) Power VIN (3-5 VDC)

13 Power GND Power GND

14 Power GND Power GND

15 Power GND Power GND

16 SWDIO (SWD debug interface)

17

UART2 TX

(Serial Channel 2)

Debug interface

GPS

18 SWCLK (SWD debug interface)

19

UART2 RX

(Serial Channel 2)

Debug Interface

GPS

20 Reference voltage for SWD debug interface

Power Input and Power Input Ground

Power is applied to the OpenIMU300ZI on pins 10 through 15. Pins 13-15 are ground; Pins 10-12 accepts 3 to 5 VDC unregulated input. Note that these are redundant power ground input pairs.

Note

Do not reverse the power leads or damage may occur. Do not add greater than 5.5 volts on the power pins or damage may occur. This system has no reverse voltage or over-voltage protection.

Note

Serial channel functions can be arbitrary assigned in the FW. Default assignments are:

Serial channel 0 -> USER  UART (dedicated for user messages).
Serial channel 1 -> GPS   UART (dedicated for connecting external GPS).
Serial channel 2 -> DEBUG UART (dedicated for debug messages and CLI interface).

In some application examples (INS, VG_AHRS) in file main.c performed reassignment of serial channels to different functions.

Note

Pin 7 needs to be grounded (LOW) upon unit startup to force unit into UART interface mode. To force unit into SPI mode this pin needs to be either unconnected or connected to the input or external device (can be externally pulled UP via 10K resistor).

In SPI mode only serial channel 2 available and can be used for communication with GPS or as DEBUG channel.