Hi
We have designed a board using ESP32-C3FN4
We are not able to detect the chip. We have provided EPSON 40MHZ crystal [FA-238].
The hardware guide for ESP32 C3 mentions that we have to choose a component in series with XTAL P pin, but does not recommend any value.
Also there is a 499ohm in series with UOTXD in the ref schematic.
Need help of experts to solve this.
Hardware connection to the ESP32 C3FN4
ESP UART -- FTDI UART
U0TXD - RX
U0RXD - TX
GND - GND
IO0 - GPIO9
RST - EN
Best Regards
ESP32 C3FN4 not detecting
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ESP32 C3FN4 not detecting
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Re: ESP32 C3FN4 not detecting
- What do you use as a 3.3V power source?
- Can you confirm the reset signal is OK? (Pulled low at startup, then high afterwards)
- Does your 40MHz crystal oscillate? Measure it with an oscilloscope, you should see a 40MHz low-ish amplitude sine on one of the pins.
- Do you see bootup chatter on the Tx0 pin when you reset the ESP?
- Can you confirm the reset signal is OK? (Pulled low at startup, then high afterwards)
- Does your 40MHz crystal oscillate? Measure it with an oscilloscope, you should see a 40MHz low-ish amplitude sine on one of the pins.
- Do you see bootup chatter on the Tx0 pin when you reset the ESP?
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- Posts: 7
- Joined: Mon Mar 21, 2022 2:58 pm
Re: ESP32 C3FN4 not detecting
Hi
I use a LDO as a power source. 3.3V is stable
I think the issue is with GPIO8 and GPIO2 not be pulled up with 10K to 3.3V, as i have connected it to an LED.
As per ESP32 C3 TRM, page 182, Table 7-2, GPIO8 and GPIO2 states should be high when the device is booting out of reset.
Will try this assumption and keep you posted.
BR
shastrinvs
I use a LDO as a power source. 3.3V is stable
I think the issue is with GPIO8 and GPIO2 not be pulled up with 10K to 3.3V, as i have connected it to an LED.
As per ESP32 C3 TRM, page 182, Table 7-2, GPIO8 and GPIO2 states should be high when the device is booting out of reset.
Will try this assumption and keep you posted.
BR
shastrinvs