Espressif Systems ESP32-C3 Series Hardware Design Manuallines page 16

2 Schematic Checklist
• R - These pins have analog functions.
• USB - GPIO18 and GPIO19 are USB pins. The pull-up value of a USB pin is controlled by the pin's pull-up
value together with USB pull-up value. If any of the two pull-up values is 1, the pin's pull-up resistor will be
enabled. The pull-up resistors of USB pins are controlled by USB_SERIAL_JTAG_DP_PULLUP bit (1 by
default).
• G - These pins have glitches during power-up. See details in Table 5.
Espressif Systems
Table 5: Power­Up Glitches on Pins
Pin Glitch
MTCK Low-level glitch
MTDO Low-level glitch
GPIO10 Low-level glitch
U0RXD Low-level glitch
GPIO18 Pull-up glitch
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Typical Time Period
(ns)
50000
15
ESP32-C3 Family Hardware Design Guidelines V0.5
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