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1. Overview
1.2. Hardware Resources
1. USB power input
Provides power supply to the whole system.
It is recommended that the system be connected to a power adapter for sufficient
current supply.
2. Battery interface
Provides power supply to the whole system when the USB power interface is not used.
The development board integrates the AP5056 power management IC to support
battery charging.
3. Power switch
Turn on the switch and the system will be powered on.
Turn off the switch and the system will be powered off.
4. I
²
S port
An I
²
S bus transmits audio data between ESP32 and the DSP.
5. ESP32-WROVER module
This is a powerful, general-purpose, Wi-Fi+BT+BLE MCU module, targeting a wide
variety of applications ranging from low-power sensor networks to the most demanding
tasks, such as voice encoding, music streaming and MP3 decoding.
6. MicroSemi DSP
This audio co-processor is used for Automatic Speech Recognition (ASR) applications. It
captures audio data from an external microphone array and outputs audio signals
through its Digital-to-Analog-Converter (DAC) port.
7. I
²
C/SPI port
ESP32, as an I
²
C master, can access slave devices via the I
²
C bus.
ESP32, as an SPI master, can access the DSP to read/write data via the SPI bus.
8. Earphone jack
Used for plugging in earphones.
9. Dual speaker output port
Supports two external speaker outputs.
10. Audio driver
This audio power amplifier sends audio signals from the DSP to external speakers for
playback.
11. DC-DC boost power supply
This fixed-frequency DC-DC voltage booster powers the audio driver.
Espressif
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2018.07