Table of Contents
Advertisement
Parameters
voltage
RL=8Ω: AT+VGR=6*; differential
RL=16Ω or 32Ω: AT+VGR=6*; single
ended
RL=16Ω or 32Ω: AT+VGR=6*;
differential
RL
Load resistance
IOUT
Output current; peak value; RL=8Ω
POUT
RL=8Ω; AT+VGR=10*;
*
The output voltage depends on the output speaker gain set by the AT command. Refer to the WISMO218 AT
Commands Manual for more information about configuring AT commands.
Pin Description
The following table provides the pin description of the analog audio interface.
Pin #
Signal
1
SPKP
2
SPKN
3
MICP
4
MICN
Application
Microphone
The following sub‐sections describe the different microphone configuration examples.
Differential Connection
When a differential connection of MIC is used, it is necessary to add a 2.2KΩ resistor from MICN to
GND in order to have a proper bias of the microphone.
WA_DEV_W228_PTS_002
Table 21. Analog Audio Interface Pin Description
I/O
I/O Type
O
Analog
Speaker positive output
O
Analog
Speaker negative output
I
Analog
Microphone positive input
I
Analog
Microphone negative input
Rev 001
Product Technical Specification &
Customer Design Guidelines
Minimum
Typical
-
-
-
-
-
-
6
8
-
-
-
-
Description
Maximum
Unit
2
Vpp
1.1
Vpp
2.2
Vpp
Ω
-
90
mA
65
mW
Page 57 of 108
Advertisement
Table of Contents
