Non-volatile storage (EEPROM) endurance

Open kakariki1 opened this issue 4 weeks ago • 1 comments

Hello,

because there was some discussion about "lifetime-limited non-volatile storage" in the past (https://github.com/Egyras/HeishaMon/issues/225) I did some research. As far as I understand, the settings are stored in an EEPROM on the indoor remote control unit.

I own a WH-MDC07J3E5 and on every change on of the settings (temperature setpoint, quiet mode, ...) there are several write operations to this EEPROM (marked red in the picture above). I confirmed this behaviour by looking at the I2C commands using a "Saleae logic analyzer". The EEPROM is a ROhm BR24G32-3 and according to the datasheet it has 1 million write cycles.

In case of a broken EEPROM this should be quite easy to replace ...

Best regards, lakeroe

Dec 01 '25 12:12 kakariki1

Don't think everything is stored on remote.. remote work's as seperate controller, so it's receives setting from pump and stores it for display.

Dec 01 '25 12:12 geduxas