User Guide

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8 Analog Expansion Connectors
8.1 16-pin Analog Connector
Unless otherwise noted, these signals interface to the WCD9335 codec (U3).
PIN
Function
Connect to
Note
1
CDC_EAR_M
2
CDC_EAR_P
3
VPH_PWR
4
GND
5
CDC_IN1_M
6
CDC_IN4_P
Mic 4 can be used for ANC
headset
7
CDC_IN1_P
8
CDC_HPH_R
9
HPH_REF
10
CDC_HPH_L
11
MBHC_HS_DET_L
Mechanical insertion detection
12
MIC_BIAS2
13
CDC_IN4_M
Mic 4 can be used for ANC
headset
14
CDC_IN3_M
Mic 3 can be used for ANC
headset
15
N.C.
16
CDC_IN3_P
Mic 3 can be used for ANC
headset
8.1.1 Earpiece
The earpiece signals are routed from the WCD9335 codec, the two signals are:
● CDC_EAR_M
●
CDC_EAR_P
8.1.2 Microphones
The 3 analog microphones are connected to the WCD9335 codec, the three mics are:
● MIC1
● MIC3 Can be used as part of an active noise canceling (ANC) system
●
MIC4 Can be used as part of an active noise canceling (ANC) system