User Guide

SMD microphone handling

The membranes of SMD microphones are fragile and break easily. It is strictly forbidden to expose the

membrane to a vacuum or to a "compressed air pistol" during cleaning of the board at any phase without

protecting the microphone from the high pressure air.

Note: It is strictly forbidden to touch the membrane. It is recommended that the microphone is not

touched manually at all.

Vibra circuitry

Vibra is used for the vibra alarm function.

The vibra motor is connected to the EM ASIC (N2200) VibraP and VibraN Pulse Width Modulated (PWM) outputs.

Figure 51 Vibra circuitry

The vibra is connected to the engine PWB through springs attached to the vibra motor body – X2100 and

X2101 are hard gold plated contact pads on the PWB.

System connector

The system connector provides a fully differential 4–wire stereo line-level output connection and a fully

differential 2-wire mono line-level or microphone level input connection.

The handsfree driver in N2200 is meant for the headset.

The output is driven in a fully differential mode. In the fully differential mode, the handsfree pin is the

negative output and the HFCM pin is the positive output. The gain of the handsfree driver in the differential

mode is 6 dB.

The HEAR N is multiplexed with a video output signal. When the video out cable is connected, the system

detects it via ACI, and switches from Xear N signal to video output automatically.

RA-6

System Module

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