Question about Input Glitch when using SENSOR_VP and SENSOR_VN

squirtle321
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Joined: Tue Jan 11, 2022 9:26 pm

Question about Input Glitch when using SENSOR_VP and SENSOR_VN

Postby squirtle321 » Tue Jan 11, 2022 10:06 pm

Hello,

I'm creating a design using ESP32-D0WD-V3 and have not included the two 270pF capacitors (specified in hardware design guidelines) between SENSOR_VP - SENSOR_CAPP and SENSOR_VN - SENSOR_CAPN.

I'm planning on using SENSOR_VN and SENSOR_CAPP as ADC, and the other two as GPIO.

First Question:
Looking at the hardware design guideline PDF on page 8, section 2.6:
If SENSOR_VP and SENSOR_VN are used as GPIOs, while ADC is supported by other pins in the circuit
design, users need to do settings in software to avoid the input glitch.
What sort of software settings are required to avoid an input glitch?

Second question:

In this forum post here:
https://www.esp32.com/viewtopic.php?t=17080#

When discussing SENSOR_CAPP and SENSOR_CAPN:
These are for an on-board LNA for the ADC; unfortunately, there were issues with the LNA and the feature got dropped from the datasheet. You can still use the pins as digital inputs (or ADC pins if you don't use WiFi)
Is there an issue with using SENSOR_CAPP as ADC in a device also using WiFi?

Would it be better to have SENSOR_CAPN and SENSOR_CAPP as GPIO and the other two as ADC?

Any help or guidance is greatly appreciated.

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