Hardware Integration: IG-2 (IMX5 + GPX1)

The Inertial Sense IG-2 is a PCB module with IMX-5 and GPX-1 multi-frequency GNSS receiver.

• Surface mount reflowable.
• Onboard dual GNSS for simultaneous RTK positioning and GPS compassing.
• Micro USB and 14 pin I/O header for convenient evaluation.

Pinout

Module Pinout

Header H1 Pinout

The IG-2 module and IG-2 header H1 have the same pinout assignment for pins 1-14. Because H1 only has 14 pins, pins 15 and above listed in the following table are only on the IG-2 module.

IG-2 Module & IG-2 H1 Pin	Name	I/O	Description
1	GND	PWR	-
2	VIN	PWR	4V-20V supply voltage input
3	+3.3V	PWR	Regulated 3.3V supply input/output.
4	Reserved		Not Connected
5	G1/Rx2/RxCAN/SCL	I/O	IMX GPIO1 Serial 2 input (TTL) Serial input pin from CAN transceiver* I2C SCL line6
6	G2/Tx2/TxCAN/SDA/STROBE	I/O	IMX GPIO2 Serial 2 output (TTL) Serial output pin to CAN transceiver* I2C SDA line Strobe time sync input
7	G3/Tx0	I/O	IMX GPIO3 Serial 0 output (TTL)
8	G4/Rx0	I/O	IMX GPIO4 Serial 0 input (TTL)
9	G5/SCLK/STROBE	I/O	IMX GPIO5 SPI SCLK Strobe time sync input
10	G6/Rx1/MOSI	I/O	IMX GPIO6 Serial 1 input (TTL) SPI MOSI
11	G7/Tx1/MISO	I/O	IMX GPIO7 Serial 1 output (TTL) SPI MISO
12	G8/CS/STROBE	I/O	IMX GPIO8 SPI CS Strobe time sync input
13	G9/nSPI_EN/STROBE /STROBE_OUT/SPI_DRDY	I/O	IMX GPIO9 SPI Enable: Hold LOW during bootup to enable SPI on G5-G8 Strobe time sync input or output. SPI data ready alternate location.
14	GPS.TIMEPULSE	O	GPS PPS UTC time synchronization signal.
15	GND	PWR	-
16	VBAT	I/O	GPS backup supply voltage. (1.4V to 3.6V) enables GPS hardware backup mode for hot or warm startup (faster GPS lock acquisition). MUST connect GPS_VBAT to VCC if no backup battery is used.
17	G10/BOOT_MODE	I/O	Leave unconnected. IMX BOOT MODE used in manufacturing. !!! WARNING !!! Asserting a logic high (+3.3V) will cause the IMX to reboot into ROM bootloader (DFU) mode.
18	G11	I/O	IMX GPIO11
19	G12	I/O	IMX GPIO12 GPS reset
20	G13/DRDY	I/O	IMX GPIO13 SPI data ready
21	G14/SWCLK	I/O	IMX GPIO14
22	nRESET	I	System reset (IMX and GPX) on logic low. May be left unconnected if not used.
23	GND	PWR	-
24	USB_N	I/O	IMX USB Data Negative Line
25	USB_P	I/O	IMX USB Data Positive Line
26	GPX_G16/QDEC0A	I/O	GPX GPIO16
27	GPX_G17/QDEC0B	I/O	GPX GPIO17
28	GPX_G18/QDEC1A	I/O	GPX GPIO18
29	GPX_G19/QDEC1B	I/O	GPX GPIO19
30	+3.3V	PWR	Regulated 3.3V supply input/output.
31	GPX_G10_BOOT	I/O	GPX GPIO10
32	GPX_G5/SCLK	I/O	GPX GPIO5 GPX SPI clock
33	GPX_G6/Rx1/MOSI	I/O	GPX GPIO6 GPX Serial 1 input (TTL) GPX SPI MOSI
34	GPX_G7/Tx1/MISO	I/O	GPX GPIO7 GPX Serial 1 output (TTL) GPX SPI MISO
35	GPX_G8/CS	I/O	GPX GPIO8 GPX SPI chip select
36	GPX_G9/SPI_EN	I/O	GPX GPIO9 GPX SPI Enable: Hold LOW during bootup to enable SPI on G5-G8
37-47	GND	PWR	-

Schematic

Download Schematic

Hardware Design

Recommend PCB Footprint and Layout

The default forward direction is indicated in the PCB footprint figure and on the silkscreen as the X axis. The forward direction is reconfigurable in software as necessary.

Download PDF

Soldering

The IMX-5 can be reflow soldered. Reflow information can be found in the Reflow Information section of this manual.

Design Files

Open source hardware design files, libraries, and example projects for the IMX module are found at the Inertial Sense Hardware Design repository hosted on GitHub. These include schematic and layout files for printed circuit board designs, and 3D step models of the InertialSense products usable for CAD and circuit board designs.

Reference Design Projects

The EVB-2, IG-1, and IG-2 circuit board projects serve as reference designs that illustrate implementation of the IMX PCB module.

EVB-2 evaluation board

IG-1 module

IG-2 module

Related Parts

Part	Manufacturer	Manufacturer #	Description
H1	JST	GHR-14V-S	14 pin connector 1.25mm pitch for IMX I/O connection.