CODEWITHSUNDEEP
esp32
shruti
shruti

Reputation: 81

esp32 EEPROM read/write cycle

I am using ESP32 module for BLE & WiFi functionality, I am writing data on EEPROM of ESP32 module after every 2 seconds.

How many read/write cycles are allowed as per standard features of ESP32 module? based on which I need to calculate EEPROM life time and number of readings (with frequency) I can store.

Upvotes: 4

Views: 10327

Answers (3)

Fernan
Fernan

Reputation: 11

At that write rate even automotive grade EEPROM like the 24LC001 which supports at least 1,000,000 writes will only last about 2 months! I think microchip has EERAM which supports infinite writes and will not loose contents on power loss. Check the microchips 47L series.

Upvotes: 1

Hugo van 't Riet
Hugo van 't Riet

Reputation: 11

I'm very late here, but an SD card seems like the ideal option for you. If you want to save just a few bytes, you can use FeRAM (also called FRAM). It's a combination between RAM and ROM, it's vast, and the data stays on it after power off. It is pretty expensive, so you might want to go with the SD card or web server option. I just wanted to tell you that this existed, I also know this for like a few months.

Upvotes: 1

romkey
romkey

Reputation: 7069

The ESP32 doesn’t have an actual EEPROM; instead it uses some of its flash storage to mimic an EEPROM. The specs will depend on the specific SPI flash chip, but they’re likely to be closer to 10,000 cycles than 100,000. Writing to it every couple of seconds will likely wear it out pretty quickly - it’s not a good design choice, especially if you keep rewriting the same location.

Upvotes: 8

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