General > General Technical Chat
DMM problem in DC millivolts range
amir.razzaqi:
--- Quote from: Gyro on July 20, 2023, 09:26:52 pm ---Yes, the 24C02 has a supply range of 1.7 - 5.5V, it will be on the same supply rail as the DTM0660 DMM chip though. This has a supply voltage range of 2.4 - 3.6V (Abs max 4V). This will have created some (over)stress.
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But I say this abut just EEPROM to reply for:
--- Quote from: tooki on July 19, 2023, 03:25:02 pm ---Did you actually get anything out of the EEPROM?
I wonder if it’s possible that you inadvertently erased or damaged the EEPROM, and that the behavior you’re seeing is because the main chip is not finding the correct configuration in the EEPROM.
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not the main chipset of DMM
tooki:
--- Quote from: amir.razzaqi on July 18, 2023, 10:28:55 am ---I didnt use any voltage level translator also I'm in doubt if I use Arduino 5.0V output pin for the first first time as vcc |O :-// But when I wire up EEPROM and Arduino (in circuit reading) I used Arduino 3.3V output pin as EEPROM's VCC.
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--- Quote from: amir.razzaqi on July 20, 2023, 07:43:58 pm ---
--- Quote from: tooki on July 20, 2023, 08:31:21 am ---Yes, but if wrong voltages were applied, as you suggested may have happened, it could have caused unpredictable behavior or damage.
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That EEPROM is "atmel 24c02" and can handle up to 5.5 volt
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FYI: Note that while the data inputs are specified to +7V in the absolute maximum ratings (i.e. the values at which the chip will be damaged), they are rated to a maximum of Vcc+0.5V in the DC characteristics. So if you powered the chip with 3.3V, but applied 5V signals to the inputs, then you’re operating it out of spec, since 3.3V+0.5V=3.8V. This should not permanently damage it, but the chip is not guaranteed to operate correctly while doing so.
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