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Classification
SIM
3.1.3
Audio Interface
MG2639 module supports 2CH audio signal inputs/outputs. It features in handheld microphone,
handheld receiver or hands-free speaker and earpiece microphone/receiver function. These two
MIC inputs are coupled in AC domain and the offset voltage is added inside, and they should
directly connect with the receiver.
differential interfaces with 32Ωresistance; SPK_2 is single-ended interface with 32Ω resistance.
See the audio interface signals in the table below:
Classification Definition
AUDIO
MIC_1N
MIC_1P
MIC_2P
SPK_1N
SPK_1P
SPK_2P
3.1.4
Network Signal Indication
RSSI_LED Internal pull-down, LED turns on at high level, and need add triode driver externally.
-Power-on status: LED off;
-Network searching status: LED blinks at 3Hz
-Idle status: LED blinks at 1Hz
-Traffic status (call, data): LED blinks at 5Hz.
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permission.
Definition
I/O
V_CARD
O
CARD_RST
O
GND
CARD_CLK
O
CARD_DATA
I/O
The two receiver interfaces SPK_1 and SPK_2 are both
I/O
I
Receiver's Microphone-
I
Receiver's Microphone+
I
Headset microphone +
O
Receiver's speaker-
O
Receiver's speaker+
O
Headset speaker +
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Description
Card voltage
Card reset
GND
Card clock
Card data
Description
Remarks
1.8V/3V; maximum
output current 20mA
Remarks
The first differential receiver
used for the default audio
input/output and the second
receiver used for headset
audio input/output.
第 9 页
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