22 Pin Io Connector - Novatel MT 4000 User Manual

22 Pin IO Connector

The 22-Pin I/O Connector provides the following functionality:
Pin # User Name
1 Ear (-) Ear Phone -
Note: This is an output only that is connected directly to the modem. Input voltages should
not be applied.
2 Ear (+) Ear Phone +
Note: This is an output only that is connected directly to the modem. Input voltages should
not be applied.
3 1-Wire 1-Wire® Interface
Note: Maximum voltage on this pin is 3.3 VDC.
4 ADC In #2 Analog-to-Digital Input, 0 – 32 VDC
5 ADC In #1 Analog-to-Digital Input, 0 – 16 VDC
6 Ground System Ground
7 Ground System Ground; Connector has longer pin for MFBL.
8 Digital Digital Input #2 (GPI9)
Input #2
9 Digital Digital Input #1 (GPI1)
Input #1
10 RS-232 RS-232 CTS Out
CTS Note: This is an output only. Input voltages should not be applied.
11 Ignition Vehicle Ignition Sense
Sense
12 MIC (-) Microphone -
Note: Although this signal is AC (capacitively) coupled to the modem, there is a 1K Ohm res-
istor to ground with a power rating of 0.0625 W. This limits maximum input voltage to
<7.9VDC. Designed for audio only, any other signals or voltages may damage the device.
13 MIC (+) Microphone +
Note: Although this signal is AC (capacitively) coupled to the modem, the MICBIAS output
from the modem has a 330 Ohm to 1K Ohm voltage divider with a 10 uF, 6.3 V capacitor con-
nected between the two resistors and to ground. Assuming a 2.6 V MICBIAS output, this lim-
its the maximum voltage that may be applied to the MIC+ input to approximately <15 VDC,
so that the voltage rating of the capacitor is not exceeded.
14 Output, High-Current Sink, Low-Current Source, Latched (GPO2)
Digital
Output 1
15 Digital Output, High-Current Sink, Low-Current Source, Latched (GPO5)
Output 2
16 Digital Output, High-Current Sink, Latched (GPO3)
Description
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