Chapter 5. Hardware related
5.3.32 Does ESP32-C3F SPI CS0 pin need an external 10 kΩ pull-up resistor?
CHIP: ESP32-C3F
• The SPI controller of ESP32-C3F supports software-programmable CS (Chip Select) pin without
external 10 kΩ pull-up resistor. - In ESP32-C3F, the CS pin can be set to any GPIO pin via SPI
controller conguration. The GPIO state can be set in the code to control the level of the CS pin.
When the SPI bus is idle, the CS pin is automatically pulled up to the default state of the GPIO pin
without an external pull-up resistor.
• Please note that when using a software-programmable CS pin, to select the target device, the pin
should be manually pulled down before the SPI bus transmission. After the transmission is com-
pleted, pull the CS pin high to release the device. Additionally, the level and status of the CS pin
should be adjusted according to the actual situation to ensure the stability and reliability of the SPI
bus.
5.3.33 Is there any hardware design reference for ESP-Skainet Speech Recognition?
• Please refer to ESP32-Korvo V1.1 User Guide.
5.3.34 Is it necessary to connect a 32 kHz RTC crystal?
CHIP: ESP32 | ESP32-C3 | ESP32-S3
• The external 32 kHz crystal is often used for Bluetooth Light-sleep timing. Therefore, when Blue-
tooth LE Light-sleep mode is not necessary, there is no need to do so.
5.3.35 For the ESP32-MINI-1 module, is there a component library for Altium Designer?
• Our hardware schematics are developed with PADS. To nd the .asc le that can be converted and opened in
Altium Designer, please go to ESP32-MINI-1 Reference Design.
• For hardware reference designs of other modules, please refer to technical documents.
Espressif Systems 161
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