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ESP32-A1S SoC module

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of 18



TWI/RSB control interface



A 24-bit 8KHz~192KHz I2S/PCM interface



Support digital copyright control of digital-to-analog converter playback output



Soft mute circuit to suppress popping

Crystal oscillator

Supports crystal oscillators with frequencies of 40 MHz, 26 MHz and 24 MHz. The accuracy of

the crystal oscillator is between ±10 PPM, and the operating temperature range is between -

40°C and 85°C. Please select the correct crystal type when using the download tool. In the

circuit design, the ground adjustment capacitors C1 and C2 are added to the input and output

terminals of the crystal oscillator, respectively. The value of the two capacitors can be flexibly

set, ranging from 6 pF to 22 pF. However, the specific capacitance value can only be

determined after matching the overall performance of the entire circuit. Generally speaking, if

the frequency of the crystal oscillator is 26 MHz, the capacitance values of C1 and C2 are

within 10 pF; if the frequency of the crystal oscillator is 40 MHz, the capacitance values of C1

and C2 are 10 pF<C1, C2<22 pF. The frequency of the RTC crystal oscillator is usually 32 kHz

or 32.768 kHz. Due to the internal calibration used to correct the frequency offset, the frequency

of the crystal oscillator may exceed the range of ±20 PPM. When the chip is working in low-

power mode, the device should select an external low-speed 32 kHz crystal oscillator clock

instead of the internal RC oscillator to obtain an accurate wake-up time.

Power consumption

ESP32 has advanced power management technology that can switch between various power saving

modes



Active mode: The chip's radio frequency is in working condition. The chip can receive,

transmit and listen to signals



Modem-sleep mode：The CPU keeps running and the clock can be configured. Wi-

Fi/Bluetooth baseband and radio frequency off



Light-sleep mode：The CPU is suspended. RTC and ULP coprocessors run. Any wake-up

event (MAC, host, RTC timer or external interrupt) will wake up the chip

Ai-Thinker Technology ESP32-A1S User Manual

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