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Hardware Integration: IG-1-IMX-5

IG-1

The Inertial Sense IG-1 is a PCB module with IMX-5 and dual ublox ZED-F9P multi-frequency GNSS receivers.

  • 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

IG1 Module Pinout

Header H1 Pinout

IG1 H1 Pinout

The module and header H1 have the same pinout assignment for pins 1-14. All pins 15 and above are only on the module.

Module
& 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 GPIO1
Serial 2 input (TTL)
Serial input pin from CAN transceiver*
I2C SCL line6
6 G2/Tx/TxCAN/SDA/STROBE I/O GPIO2
Serial 2 output (TTL)
Serial output pin to CAN transceiver*
I2C SDA line
Strobe time sync input
7 G3/Tx0 I/O GPIO3
Serial 0 output (TTL)
8 G4/Rx0 I/O GPIO4
Serial 0 input (TTL)
9 G5/SCLK/STROBE I/O GPIO5
SPI SCLK
Strobe time sync input
10 G6/Rx1/MOSI I/O GPIO6
Serial 1 input (TTL)
SPI MOSI
11 G7/Tx1/MISO I/O GPIO7
Serial 1 output (TTL)
SPI MISO
12 G8/CS/STROBE I/O GPIO8
SPI CS
Strobe time sync input
13 G9/nSPI_EN/STROBE
/STROBE_OUT/SPI_DRDY		 I/O GPIO9
SPI Enable: Hold LOW during boot to enable SPI on G5-G8
Strobe time sync input or output. SPI data ready alternate location.
14 GPS_TIMEPULSE O GPS1 PPS UTC time synchronization signal.
15 GND I/O -
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. 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 GPIO11
19 G12 I/O GPIO12
GPS reset
20 G13/DRDY I/O GPIO13
SPI data ready
21 G14/SWCLK I/O GPIO14
22 nRESET I System reset on logic low. May be left unconnected if not used.
23 GND PWR -
24 USB_N I/O USB Data Negative Line
25 USB_P I/O USB Data Positive Line
26 GPS1_RX2 I Ublox ZED-F9P RXD2 (GPS1)
27 GPS1_TX2 O Ublox ZED-F9P TXD2 (GPS1)
28 GPS2_RX2 I Ublox ZED-F9P RXD2 (GPS2)
29 GPS2_TX2 O Ublox ZED-F9P TXD2 (GPS2)
30 +3.3V PWR Regulated 3.3V supply input/output.
31 GPS2_TIMEPULSE O GPS2 PPS UTC time synchronization signal.
32-36 NC - Not connected internally
37-69 GND PWR -

Hardware Versions

The following outlines differences in the IG-1.x hardware versions.

IG-1.2

  • GPS1 ZED-F9P RXD2/TXD2 lines connected to IG-1 pins 26, 27.
  • GPS2 ZED-F9P RXD2/TXD2 lines connected to IG-1 pins 28, 29.
  • GPS1 ZED-F9P PPS (TIMEPULSE) line connected to IG-1 pin 31.
  • IG-1 pins 32-36 are not connected internally (not connected to ground).

IG-1.1

  • GPS1 PPS line connected to IMX TIMEPUSE G15 (pin 20).
  • IG-1 pins 26-36 are connected to ground.

IG-1.0

  • GPS1 PPS line connected to IMX G8 (pin 8).
  • IG-1 pins 26-36 are connected to ground.

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 IG-1 circuit board projects serve as reference designs that illustrate implementation of the IMX PCB module.

IG-1 module

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