Timeline for Determining I2C Address without Datasheet
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jul 21, 2013 at 19:58 | comment | added | Passerby | Well, yes, that too, but bigger i2c eeproms work like multiple smaller i2c eeproms, with the same address. A 4kb eeprom responds to only one address, but a 32kb eeprom responds to multiple addresses, including the same address that the 4kb eeprom would, because the page is part of the address. | |
| Jul 21, 2013 at 19:46 | comment | added | srlm | @Passerby Good point. Many I2C devices have at least one hardware selectable address bit, and some such as EEPROMs have more. The EEPROMs that I have worked with have 4. With any sort of hardware scan you'll only be able to get the currently set address, not all possible addresses for that device. | |
| Jul 21, 2013 at 19:30 | vote | accept | apnorton | ||
| Jul 21, 2013 at 19:22 | comment | added | Passerby | Just a side note, knowing what the i2c device does would also help. For example, i2c Eeproms can ack multiple addresses. | |
| Jul 21, 2013 at 19:10 | history | answered | srlm | CC BY-SA 3.0 |