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Chapter 6: Omnii Expansion Ports and Connectors
Audio Connector
Figure 6.2 Connector Locations on the GPS Module
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6.3
Audio Connector
Theory of Operation
The Omnii main logic board exposes a 16-pin audio connector, providing a means of connecting
audio input and output devices such as headsets, push-to-talk handsets and external speakers.
Included in the expansion interface are the following connections:
•
HPL and HPR: left and right audio outputs (Headphone Left and Headphone Right)
•
HP_AMP_EN: enable line for headphone amplifier circuit
•
HP_DETECT_N: headset detection
•
MIC+ and MIC-: differential audio inputs from expansion board into main logic board
•
MIC_AMP_EN: enable line for microphone amplifier and biasing circuitry
•
PTT_DETECT: detection of push-to-talk switch
•
SPKR_EXP_R and SPKR_EXP_R+: differential audio outputs for driving a
loudspeaker (4 or 8 Ohms)
Audio Connector Details
The audio connector is a side-entry 0.8 mm pitch disconnectable insulation
displacement connector.
Manufacturer:
Manufacturer Part Number:
Mating Connector:
Number of Pins:
Current Rating:
Figure 6.3 Diagram of JST Audio Connector
84
Psion Teklogix Omnii HDK User Manual
JST
SM16B-SURS-TF(LF)(SN)
16SUR-32S
16
0.5 A per pin for 32 AWG wire
(do not use 36 AWG wire)
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