Espressif Systems ESP32-C3FH4 Hardware Design Manuallines page 16

2 Schematic Checklist
• 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.
• G - These pins have glitches during power-up. See details in Table 5.
Pin
MTCK
MTDO
GPIO10
U0RXD
GPIO18
1
Espressif Systems
Table 5: Power­Up Glitches on Pins
1
Glitch
Low-level glitch
Low-level glitch
Low-level glitch
Low-level glitch
Pull-up glitch
Low-level glitch: the pin is at a low level during the time period;
High-level glitch: the pin is at a high level during the time period;
Pull-up glitch: the pin is pulled up during the time period;
Pull-down glitch: the pin is pulled down during the time period.
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Typical Time Period
(ns)
15
ESP32-C3 Family Hardware Design Guidelines V1.0
5
5
5
5
50000