Keypad - Nokia 6088 Baseband Description And Troubleshooting

6088 (RM218)
Baseband Description and Troubleshooting
(MIC2P/N).
The MICBIAS output ("MIC_BIAS" signal) is used for internal microphone bias to
provide 0.2 mA of current at 1.8 Volts DC.
VDD_MSMP (2.95V) regulated voltage from PM IC is used for headset microphone
bias.
(U100)
Figure 16: Audio Receiving Direction Block Diagram
RECEIVER+ & RECEIVER- (MSM pins EAR1OP & EAR1ON) differential outputs are
used for the mobile terminal's internal receiver. HPH_L (MSM pin EAR2)
single-ended output is used for accessory external headset. AUXOP & AUXON
differential outputs are used to drive external loudspeaker via external audio power
amplifier (U100).
The output power for the differential (EAR1O) output is typically 35 mW for a
full-scale +3 dBm0 sine wave into a 32 ohm receiver.
The output power for the single-ended (EAR2) output is typically 8.8 mW for a
full-scale +3 dBm0 sine wave into a 32 ohm receiver (earpiece).
The output power for the auxiliary (AUXO) output is typically 1.87 mW for a full-scale
+3 dBm0 sine wave into a 600 OHM load.

Keypad

The mobile terminal uses eight blue light-emitting diodes (LEDs) for keypad
illumination. MSM GPIO42 is used to turn on/off these LEDs.
MSM uses GPIO57 ~ GPIO66 (KYPD0, KYPD1, KYPD3, ~ KYPD17) to do keypad
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