ESP32-SOLO-1 ADC clarification

[KT819GM]

Hello,

I've bought ESP32-SOLO-1 from mouser like a week ago in hope that it will have new features for ADC calibration available, but on monitor I see:
eFuse Two Point: NOT supported
eFuse Vref: NOT supported
Just wan't confirmation that it's new module using old chip and how to identify chip capabilities before buying it.

[angelsinacento]

Hi KT81GM, I also bought ESP32-SOLO-1 from Mouser on the Dev-KitC-v4 board. Have you been able to flash and run example programs on it? I have tried for a couple of days without sucsess. What guide/tutorial did you follow?

[ESP_Alvin]

Hi, angelsinacento

Is there anything in this post that could help? https://esp32.com/viewtopic.php?f=2&t=7307

Thanks.

[cmorgan]

Hi @kt819gm.

Have you made any progress here? I've been looking forward to ESP32 ADC calibrations being in place for some time now, how can we tell which modules have been calibrated vs. not? It that a chip issue, are these older chips prior to the calibration being put in place?

Chris

[ESP_Dazz]

how can we tell which modules have been calibrated vs. not?

I suggest you contact sales@espressif.com about this. They should be able to track down which chips have which type of calibration.

[WiFive]

I suggest you contact sales@espressif.com about this. They should be able to track down which chips have which type of calibration.

This is very disorganized especially now that major distributors are stocking modules. There has to be something like "##% of TYPE modules produced after ##/#### have VREF calibration, ...".

[ESP_Dazz]

This is very disorganized especially now that major distributors are stocking modules. There has to be something like "##% of TYPE modules produced after ##/#### have VREF calibration, ...".

I'm afraid date codes are only applicable to chips. VREF calibration has been applied to ESP32-D0WD and ESP32-D0WDQ6 chips produced on/after the 1st week of 2018. Therefore, ESP32-D0WD and ESP32-D0WDQ6 chips with date codes on/later than 012018 should have VREF calibration (see image below).

Chip Surface Marking.JPG (45.29 KiB) Viewed 11013 times

For modules, the only way to determine if modules have calibration is to contact your distributor. They should be able to check their batch numbers with our sales team. However, as far as I know only a small batch of WROVER modules have EFUSE calibration, and this batch had both VREF and Two Point Calibration values.

[WiFive]

Ok, that is helpful.

Manufacturing has provided more detailed information showing there were some ESP32-WROVER, ESP32-WROVER-I and ESP32-WROVER-B modules produced with this coding scheme, although since August all modules have used the "None" coding scheme again. Espressif plans to provide a complete statement about this soon.

So do you know approximately how many modules this includes?

For SOLO, D2WD, and PICO is there any factory calibration?