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Espressif Systems ESP User Manual

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Chapter 5. Hardware related
For detailed di󰝗erences between chip revisions, please refer to respective chip errata documents from Espressif
s documentation page.
For a complete explanation of the chip silk marking, please refer to Espressif Chip Packaging Information.
5.2 Development board
5.2.1 How long does it take for the ESP-WROOM-02D module to restart after the reset
signal?
It will restart when the input level is lower than 0.6 V for more than 200 μs.
5.2.2 According to the schematic of ESP32-LyraT-Mini, the analog output of the ES8311
codec chip is connected to the input of the ES7243 ADC chip. What is the purpose
of this?
The hardware acquisition circuit of the AEC reference signal simultaneously transmits the DAC output of the
Codec (ES8311) to the speaker PA and the ADC (ES7243) AINLP/N, of which the signal collected would be
send back to the ESP32 as the reference signal for the AEC algorithm.
5.2.3 When using the ESP32-MINI-1 module, the serial port printed the follows log when
powered on. What could be the reason?
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
ets Jul 29 2019 12:21:46
The reason could be 󰝙ash is not programmed.
Which GPIO is connected to the RGB LED of the ESP32-S3-DevKitC-1 development board?
————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————————
The RGB LED on the ESP32-S3-DevKitC-1 v1.0 development board is connected to GPIO48.
The RGB LED on the ESP32-S3-DevKitC-1 v1.1 development board is connected to GPIO38.
The reason why the ESP32-S3-DevKitC-1 v1.1 development board changed the RGB LED pin to GPIO38
is that the ESP32-S3R8V chips VDD_SPI voltage has been set to 1.8 V. Therefore, unlike other GPIOs,
GPIO47 and GPIO48 in the VDD_SPI power domain of this chip also operate at 1.8 V.
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Espressif Systems ESP Specifications

General IconGeneral
BrandEspressif Systems
ModelESP
CategoryMotherboard
LanguageEnglish