Quectel FCM561D-P, Проектирование аппаратного обеспечения

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Wi-Fi&Bluetooth Module Series
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Table 18
：
Pin Definition of I2S Interface
3.4.12. Analog Audio Interface
In the case of multiplexing, the module comes with a rich set of audio peripherals to enhance the
listening experience, including a four-band digital equalizer, two analog-to-digital converters (ADC), two
digital-to-analog converters (DAC), two microphone input amplifiers, two audio amplifiers, as well as an
SBC decoder accelerator.
It contains two high-fidelity ADCs with sample rates of 8 kHz, 16 kHz, 44.1 kHz, or 48 kHz and also
integrates two high-fidelity DACs with sample rates of 8 kHz, 16 kHz, 44.1 kHz, or 48 kHz. The
microphone signal can be amplified with gain from 0 to 32 dB with 2 dB/step. The module also provides
two high-quality audio amplifiers
capable of driving 16 Ω speakers with up to 30 pF of load capacitance.
Table 19: Pin Definition of Analog Audio Interfaces
3.4.13. SAR ADC Interface
The module embeds 13-bit general-purpose SAR ADC interfaces with programmable sampling rates
ranging from 12.5 kHz up to 1.625 MHz. The 13-bit resolution ADC can be configured to 15
–17 bits. The
ADC interfaces support up to 8 external input channels. It can operate in one-shot mode, software
control mode and continuous mode. The ADC supports full scale input range (0 V to 2 × VREF).
Pin Name Pin No.
Multiplexing
Function
I/O Description Comment
GPIO9 73 I2S_DOUT DIO I2S data out
See Table 6 for other
GPIO pins multiplexed
as I2S interface.
GPIO8 41 I2S_DIN DIO I2S data in
GPIO7 59 I2S_WS DIO I2S word select
GPIO6 60 I2S_CLK DIO I2S serial clock
GPIO28 10 I2S_MCLK DIO I2S master clock
Pin Name Pin No. I/O Description
MIC_P 26 AI Microphone analog input (+)
MIC_N 25 AI Microphone analog input (-)
SPK_P 24 AI Analog audio differential output (+)
SPK_N 23 AI Analog audio differential output (-)