HG1120 Installation and Interface Manual
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aerospace.honeywell.com/HG1120
5
Electrical Interface
The pin assignments of the external system connector are shown below.
Logic 0 corresponds
to the CMOS “low” logic state. Logic 1 corresponds to the CMOS “high” logic state.
Table 1. Connector Pin Description
PIN #
SIGNAL NAME
INPUT/OUTPUT & SIGNAL TYPE
SIGNAL FUNCTION
1
DIO3
Input - Device Configuration
CMOS compatible logic
No connect results in Logic 1. Active low for logic 0.
2
DIO4
Input – Device Configuration
CMOS Compatible Logic
No connect results in Logic 1. Active low for logic 0.
3
SPI_SCLK
Input
CMOS Compatible Logic
SPI Clock
4
SPI_MOSI
Input
CMOS Compatible Logic
SPI Master Out Slave In (MOSI) data.
5
SPI_MISO
Output
CMOS Compatible Logic
SPI Master In Slave Out (MISO) data
6
SPI_SS
Input
CMOS Compatible Logic
SPI Slave Select (chip select), Default high, Active
low
7
DIO1
Input – Device Configuration
CMOS Compatible Logic
No connect results in Logic 1. Active low for logic 0.
8
RESET_N
Input – Device Configuration
CMOS Compatible Logic
Logic 0 applied for 15 milli-seconds will stop all
processing. Upon logic 1, the IMU will restart as
if power had been removed and re-applied. No
connection is required.
9
DATA_RDY
Output
CMOS Compatible Logic
Data Ready on Rising Edge to Logic 1.
@ Logic 1, maximum 500 micro-seconds.
10
DIO2
Input - Device Configuration
CMOS Compatible Logic
No connect results in Logic 1. Active low for logic 0.
11,12
VDD
Input Power (3.0 – 5.5 VDC)
The input voltage should monotonically increase at
start with ripple < 30 mV P-P. The device draws < 0.4
Watts and 125 mA.
13
PWR_RTN
Power Return
Return path for input power.
14
DGND
Signal Return
Use this pin to reference digital signals.
15
PWR_RTN
Power Return
Return path for input power.
16
SER_DATA_OUT_H
Output RS-422
Asynchronous High
17
No Connect
N/A
N/A
18
SER_DATA_OUT_L
Output RS-422
Asynchronous Low
19-21
No Connect
22
CAN_L
Bi-directional - ISO 11898-2
Can Bus Low
23
No Connect
No Connect
24
CAN_H
Bi-directional - ISO 11898-2
Can Bus High
