Chapter 5. Hardware related
5.3.20 For modules housing ESP32, which pins cannot be set by users?
• For ESP32-WROOM Series of modules, GPIO6 ~ GPIO11 are pins for ash and cannot be set for other uses.
• For ESP32-WROVER Series of modules, GPIO16 and GPIO17 are pins for PSRAM and cannot be set for
other uses.
• Besides, please note that ESP32 has ve strapping pins. For details, please refer to ESP32 Datasheet.
5.3.21 Which is the reset pin of ESP32?
• CHIP_PU serves as the reset pin of ESP32. The input level (VIL_nRST) for resetting the chip should be
low enough and remain so for a period of time. Please refer to Section Reset in the ESP32 Hardware Design
Guidelines.
5.3.22 What should be noted when I design the power supply for ESP8266?
• If you use LDO regulators, please ensure the input voltage ranges from 2.7 V to 3.6 V and the output current
is greater than 500 mA.
• The decoupling capacitor must be as close to the chip as possible. The equivalent resistance should be low
enough.
• ESP8266 is not 5 V tolerant. It operates at 3.3 V, with the operating voltage ranging from 2.7 V to 3.6 V.
• If you use DC/DC converters, please add LC lters when necessary.
• Please refer to Section
Power Supply
in the ESP8266 Hardware Design Guidelines.
5.3.23 When I use the TOUT pin of ESP8266 to collect ADC sample signals, will the pins
be damaged if the voltage is greater than 1.0 V?
• If the input voltage is within the operating range of pins (0 V ~ 3.6 V), the pins will not be damaged.
• If the voltage is greater than 1.0 V, it may lead to abnormal results.
5.3.24 For modules with PCB antennas, what should be noted when I design the PCB and
the housing of the antenna?
• When adopting on-board design, you should pay attention to the layout of the module on the base board. The
interference of the base board on the module’s antenna performance should be reduced as much as possible.
• It is recommended that the PCB antenna area of the module be placed outside the base board, while the module
be put as close as possible to the edge of the base board so that the feed point of the antenna is closest to the
board.
• Please make sure that the module is not covered by any metal shell. The antenna area of the module and the
area 15 mm outside the antenna should be kept clean (namely no copper, routing, components on it).
• For details, please refer to Hardware Design Guidelines.
5.3.25 Can GPIO 34 ~ GPIO39 of ESP32 be used as UART RX pins?
• GPIO 34 ~ GPIO39 can be used as UART RX pins.
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