Neoway WM620 - Adc; Table 3-11 EAR Parameter; Table 3-12 SPK Parameter

WM620 Hardware User Guide
Copyright © Neoway Technology Co., Ltd
27
MIC current
0.020
-
1.5
mA
Mute mode
-
50
100
uA
Idle status
-
10
100
uA
Table 3-11 EAR parameter
EAR
Min.
Typical
Max.
Unit
Power supply
voltage
2.0
2.1
2.2
V
Impedance
between EAR_P
and EAR_N
25.6
32
–
Ω
Output power
50
mW
Table 3-12 SPK parameter
SPK
Min.
Typical
Max.
Unit
Power supply
voltage
2.0
2.1
2.2
V
Impedance
between SPK_P
and SPK_N
12
16
–
Ω
Output power
50
mW
 Audio signals are analog and should be protected from interference and ESD.
 Differential signal trace is required for dual-ended signals.
 Users can add audio amplifier to output circuits to enhance the audio signals.
 Do not ground the audio output pin directly. Otherwise, some abnormity might occur to the module.
 Do not miss match the I/O pins of two audio channels because they are fixed inside the module.
3.8 ADC
Pin
Signal
I/O
Function
Remarks
49
ADC
AI
ADC input
Connect to GND if not used
The 49
th
pin can convert a channel of analog signal to digit signal, that is, it can quantize the voltage
signals and temperature signals using 12-bit digit signals. Users can use the AT+GETADC command to
query. For more information, refer to Neo_WM620 WCDMA Module AT command Set.