MeiG_SLM550_Hardware Design Manual
MeiG Smart Technology Co., Ltd
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The module integrates a stereo headphone jack. Users are advised to reserve ESD devices during the
design phase to prevent ESD damage. The HS_DET pin of the module can be set as an interrupt. In
software, this pin is the earphone interrupt by default. The user can use this pin to detect the plugging
and unplugging of the earphone.
Figure 30 Headphone Interface Circuit
Note:
1. The earphone holder in Figure 4.24 is normally closed. If the user is using the normally open mode
earphone holder, please modify the detection circuit according to the actual pin and modify the
software accordingly.
2. We recommend that the headphone detection pin HS_DET and HPH_L form a detection circuit (the
connection method in the above figure), because HPH_L has a pull-down resistor inside the chip,
which can ensure that HS_DET is low when connected with HPH_L, if the user will HS_DET and
HPH_R To connect, please reserve a 1K pull-down resistor on HPH_R.
3. The standard of the headphone interface is the European standard OMPT. If you need to design
the American standard CTIA interface, you need to swap the GND and MIC signals for the network.
If you want to be compatible with both headset standards, you need an external dedicated chip,
such as the TI-TS3A226AE.
4.8.4 LINE OUT Circuit
The LINE OUT interface output adopts differential output, which requires an external audio amplifier
driver.
4.8.5 I2S Interface
There are a groups of GPIO-compatible I2S interfaces inside the module. The pins used by this function
are as follows:
Name
Pin
Intput/Output
Description
GPIO100
101
O
I2S1 output DATA
GPIO99
103
O
I2S1_ WS
