samueljmullen
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« Reply #30 on: October 11, 2020, 02:09:24 PM »
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you’re awesome and I super appreciate you helping me with this. So I’m guessing I can directly apply 12v to the pin indicated while the test strip is on it (I assume I don’t need to apply ground as that’s probably done by the test strip. This will allow me to read it, also write when I’m ready to immo? Please confirm, thanks!
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samueljmullen
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« Reply #31 on: October 11, 2020, 02:19:44 PM »
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I read somewhere that automotive eeproms, commonly, the pin layouts are inverted, is that true? I might have misread that
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elektronik13
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« Reply #32 on: October 11, 2020, 02:24:30 PM »
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you’re awesome and I super appreciate you helping me with this. So I’m guessing I can directly apply 12v to the pin indicated while the test strip is on it (I assume I don’t need to apply ground as that’s probably done by the test strip. This will allow me to read it, also write when I’m ready to immo? Please confirm, thanks!
if both devices are on common ground you don't need anything else |
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elektronik13
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« Reply #33 on: October 11, 2020, 02:26:01 PM »
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I read somewhere that automotive eeproms, commonly, the pin layouts are inverted, is that true? I might have misread that
it is possible, make sure it is not |
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samueljmullen
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« Reply #34 on: October 11, 2020, 02:30:39 PM »
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ok I’ll do a little more research, thanks for the quick reply
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samueljmullen
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« Reply #35 on: October 11, 2020, 02:32:57 PM »
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sometimes everything I write doesn’t post:
here’s the source for the automotive inverted eeproms, true or not. Ok I’m going to take your comment as an affirmative. I’m going to go ahead and test with the 12v applied directly with the test clip. If I get my car emergency started today then it’ll be maybe tomorrow when I can actually proceed to read the eeprom dump
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elektronik13
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« Reply #36 on: October 11, 2020, 02:41:39 PM »
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sometimes everything I write doesn’t post:
here’s the source for the automotive inverted eeproms, true or not. Ok I’m going to take your comment as an affirmative. I’m going to go ahead and test with the 12v applied directly with the test clip. If I get my car emergency started today then it’ll be maybe tomorrow when I can actually proceed to read the eeprom dump
if the eeprom is not reversed then pin 2,3,4 are ground and pin 8 is +12 check with pin 8 if it is +12 when ecu powered https://pdf1.alldatasheet.com/datasheet-pdf/view/446882/TGS/24C02.htmlhttp://www.datasheetq.com/24C02-doc-Atmel |
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« Last Edit: October 11, 2020, 02:54:34 PM by elektronik13 »
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samueljmullen
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« Reply #37 on: October 11, 2020, 02:55:10 PM »
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I googled inverted eeprom pins and didn’t find anything, yet; so that might have been misinformation. I did look at the datasheet and it’s saying ~5v for the supply voltage so I’m hesitant to apply the full 12v. I also notices there’s no write protection on the 24c02 (which is mine) as opposed to the 24c03 with write protection. I was doing more reading on a different bigger chip and it was specifying 12v to write but the read pin was different as well
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samueljmullen
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« Reply #38 on: October 11, 2020, 02:58:09 PM »
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attached
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samueljmullen
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« Reply #39 on: October 11, 2020, 03:00:48 PM »
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not sure how I’d step the voltage from 12v to 5v without accidentally erasing/writing to the eeprom
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elektronik13
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« Reply #40 on: October 11, 2020, 03:01:37 PM »
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I googled inverted eeprom pins and didn’t find anything, yet; so that might have been misinformation. I did look at the datasheet and it’s saying ~5v for the supply voltage so I’m hesitant to apply the full 12v. I also notices there’s no write protection on the 24c02 (which is mine) as opposed to the 24c03 with write protection. I was doing more reading on a different bigger chip and it was specifying 12v to write but the read pin was different as well
eeprom always has +5 power nothing else +12 will kill eeprom if you power up +12 ECU, you only need SC SD AND GROUND +5 will give the ECU to the eeprom |
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samueljmullen
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« Reply #41 on: October 11, 2020, 03:02:21 PM »
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Or maybe the extra voltage wouldn’t hurt it? I can always ‘try it out’
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samueljmullen
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« Reply #42 on: October 11, 2020, 03:05:35 PM »
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You replied quickly. So apply the 12v to the ECU? Is there a way to do that? I know I could hook it up MPPS style and apply the 12v but maybe that tutorial was only for flashing and not reading. hmmmmmmm
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samueljmullen
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« Reply #43 on: October 11, 2020, 03:07:14 PM »
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I’m glad I didn’t immediately apply the 12v directly to the eeprom. That would have been an ‘oops moment’ lol
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elektronik13
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« Reply #44 on: October 11, 2020, 03:08:13 PM »
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You replied quickly. So apply the 12v to the ECU? Is there a way to do that? I know I could hook it up MPPS style and apply the 12v but maybe that tutorial was only for flashing and not reading. hmmmmmmm
eeprom can be deleted by itself, only below + 5v but I don't know anything about it give +12 on ecu as mpps says on eeprom there will be +5 pin 8 |
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« Last Edit: October 11, 2020, 03:11:56 PM by elektronik13 »
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