Espressif Systems ESP32-C3 Series

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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

Table 5: PowerUp Glitches on Pins

Typical Time Period

Pin Glitch

(ns)

MTCK Low-level glitch 5

MTDO Low-level glitch 5

GPIO10 Low-level glitch 5

U0RXD Low-level glitch 5

GPIO18 Pull-up glitch 50000

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ESP32-C3 Family Hardware Design Guidelines V0.5

Espressif Systems ESP32-C3 Series - Page 16