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One-wire, self-powered EEPROM

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New from Atmel is a self-powered EEPROM which has just two active pins; one for data (SI/O) and the other for earth return(GND), no connection to a supply voltage is necessary. The SI/O signal acts as both data and power line, the EEPROM harvesting power from the data signal during the high time of the protocol sequence. The memory also has a factory-assigned 64-bit unique serial number for each device and with ESD tolerance to IEC 61000-4-2, the SI/O line can be directly accessed from outside the application. The memory consumes around 700 nA in standby mode with a 200 μA write cycle and 80 μA read cycle at 25°C. Operational speed is quoted at 125 kbps. The devices use the I2C protocol, allowing up to eight devices on the same bus. The new memory should find a home in the internet of things (IoT), wearables, consumable, battery and cable identification applications. The novel power arrangement means that there is also no requirement for external capacitors and rectifiers.

Contact Conrad Coetzee, Arrow Altech Distribution, Tel 011 923-9600, ccoetzee@arrow.altech.co.za

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