Espressif Systems ESP - Page 175

Chapter 5. Hardware related
5.3.15 Why is the suggested voltage range of ESP32 modules dirent from that of ESP32
chips?
• This is because of the di󰝗erent working environments and usage scenarios. - The ESP32 chip is a bare die and
requires external circuitry on a circuit board to function properly. The recommended operating voltage range
for the ESP32 chip is 2.3 V to 3.6 V, which is determined by the chip’s electrical parameters. Within this
voltage range, the ESP32 chip can function properly and provide optimal performance and power consump-
tion. - The ESP32 module, on the other hand, is a packaged electronic module that typically includes voltage
regulators, external crystals, external antennas, and other peripheral chips, such as 󰝙ash memory and RAM,
and can be used directly. As the module’s circuitry has already been optimized and tested, its recommended
operating voltage range may be narrower. For example, the ESP32-WROOM-32 module has a recommended
operating voltage range of 3.0 V to 3.6 V. Apart from that, as the module has to take 󰝙ash voltage into account,
the recommended operating voltage for the ESP32 module would thus be higher.
• When using these chips and modules, appropriate power supplies and peripheral circuits should be chosen
based on the speci󰝘c situation to ensure that they function properly.
• For more information, please check module and chip datasheets.
5.3.16 Why does it take a longer time to erase the ash of self-developed modules than
that of Espressif modules?
• It is common that the erasing time vaires, as it depends on factors such as the manufacturer of your 󰝙ash and
the size of the block you erase.
• If you want to shorten the erasing time, you may test 󰝙ash memories from di󰝗erent manufacturers.
5.3.17 Why does the current surge when ESP8266 is powered on?
• The RF and digital circuits of ESP8266 are highly integrated. When ESP8266 is powered on, the RF automatic
calibration starts to work, which requires high current.
• The maximal current of the analog circuit can reach 500 mA, while that of the digital circuit is 200 mA.
• Usually the average current is 100 mA.
• To wrap up, ESP8266 needs a 500 mA power supply.
5.3.18 What choices do I have when conguring the RMII clock for the Ethernet of
ESP32?
• We recommend use GPIO0 as the RMII clock input pin. Please note that the GPIO0 cannot be low level when
the chip powered on.
• For details, please refer to the Con󰝘gure MAC and PHY guide.
5.3.19 What kind of socket is used on ESP32-LyraT development boards to connect a
speaker?
Please use a PH-2A socket.
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