bits of contiguous EEPROM memory. The device is available in the standard 8- pin PDIP, 8-pin SOIC ( mm), 8-pin 2×3 DFN and TDFN, 8-pin MSOP and. DataSheet: PDF icon Serial EEPROM 24Cpdf. AT24C02 is an electrically erasable and programmable ROM. It has a 2Kbits of memory size arranged in 32 . edge clock data into each EEPROM device and negative edge clock Part of the Array Protected. 24C01A. 24C 24C 24C 24C At VCC. Full (1K).
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24C02 Datasheet(PDF) – STMicroelectronics
Even the data sheet that you linked can lead to confusion in this regard. In shet 4 they refer to the address as an 8-bit quantity:.
Also be aware that the A0 to A2 pins on the device package are meant to remain static in a design. If a total of eight 24C02’s are used in the design then each of the devices will have these three pins hard strapped in a different combination from the set of b, b, b, b, b, b, b and b. When you say that you are “writing” to the pins this does not make clear exactly what you are doing.
Normally there is no writing to the 24C02 pins.
Serial EEPROM AT24C02
Instead the three bits that you supply out on the interface in the device address field must match the hard strapped values on the pins in order for the device to be selected. On top of that I have never been sure that it is even possible to dynamically change the strapped value on the A0, A1 and A2 pins of a 24C02 after it has powered up. A2 are used for creating the address. The device will not respond to the address that is being set dynamically.
Home Questions Tags Users Unanswered. Found 8 device s. Check your chips markings.
You do not write the addresses; you hardwire them. TurboJ The chip says the following: Can you explain what hardwiring is? In figure 4 they refer to the address as an 8-bit quantity: In Arduino, the function that does this is digitalWrite.
Fritzing Project – Read/Write Serial EEPROM via I2C
That’s why I said “write”. If you just have one 24C02 then you would connect all three of those pins to GND as edprom.
Then when you want to write to the part use an address byte of 0xA0 and when you want to read use an address byte of 0xA1. Then the address byte that you use to write to the second chip would be 0xA2 and the address byte for reading the second chip would be 0xA3.
Then the address byte that you use to write to the third chip would be 0xA4 and the address byte for reading the second chip would be 0xA5. Can’t change the values dynamically. It will answer to address that shee set up before powering up. So for example you keep A0: MaNyYaCk 6 Can you give more information?
But my suggestion would to directly connect them to ground or VCC for the addressing scheme.
Maybe the issue is setting the address after power on. I will try in about an hour. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.