User's Manual

LE920A4 HW User Guide Hardware Interfaces
Doc#: 1VV0301261 Audio Interface
Rev. 4.3 Page 81 of 123 2017-12-07
PAD Signal I/O Function Type Comments
AH3 WiFi_SD_DATA2 I/O WiFi SD Serial Data 2 1.8V
AK3 WiFi_SD_DATA3 I/O WiFi SD Serial Data 3 1.8V
Y3 WiFi_SDRST O WiFi Reset / Output Control 1.8V Active low
AS3 WCI_TX O Wireless coexistence
interface TXD
1.8V
AT2 WCI_RX I Wireless coexistence
interface RXD
1.8V
NOTE:
It is recommended that WiFi_SDRST be equipped with a pull-up resistor to
1.8V on the host application to disable the WiFi reset function if needed.
Audio Interface
The module provides analog and digital audio interfaces.
8.6.1. Analog Audio
The module provides a single analog audio path for transmitting and receiving on the
following pins:
Table 33: Analog Audio Signals
PAD Signal I/O Function Type Comment
B5 EAR1_MT+ AO
Earphone Signal Output 1,
phase +
Analog
A4 EAR1_MT- AO
Earphone Signal Output 1,
phase -
Analog
B3 MIC1_MT+ AI Mic Signal Input 1, phase + Analog
A2 MIC1_MT- AI Mic Signal Input 1, phase - Analog
G6 MICBIAS AO Mic bias Analog
E2 EAR2_MT+ AO
Earphone Signal Output 2,
phase +
Analog
D1 EAR2_MT- AO
Earphone Signal Output 2,
phase -
Analog