Led; Audio; Analog Audio; Figure 16. Led Reference Circuit - Sierra Wireless AirPrime AR7558 Hardware Integration Manual

Hardware Integration Guide
Table 54. ADC Interface Characteristics
ADC
Full-Scale Voltage Level
ADCx Resolution
Input Impedance

6.14. LED

The AirPrime AR7558 provides an LED control output signal pad. This signal is an open drain input.
Table 55. LED Interface Pad
Pad Name
AA6 LED
Figure 16. LED Reference Circuit
The behavior of the LED signal can be modified using the AT command AT!LEDCTRL.

6.15. Audio

The AirPrime AR7558 supports both Analog and Digital audio interfaces. The following diagram
illustrates the Audio subsystem and identifies where various AT commands affect the audio
subsystem. Refer to document [7] for details of the AT commands.
[Diagram tbd]
Figure 17. Audio Block Diagram

6.15.1. Analog Audio

The AirPrime AR7558 provides a mono differential analog audio interface.
Table 56. Analog Audio Interface Pads
Pad Name
CD9 AUDIO1_IN_P
CC10 AUDIO1_IN_M
CE6 AUDIO1_OUT_P
CE8 AUDIO1_OUT_M
4116922
Direction Function
Output LED driver control
Direction
Input
Output
Rev 1.1
Value
1.8
15
>4
Function
Microphone 1 input positive
Microphone 1 input negative
Speaker 1 output positive
Speaker 1 output negative
Baseband Specification
Units
V
bit
MΩ
If Unused
Leave Open
Interface
Primary
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