I'd recommend a DS1307 RTC ic. It has battery backed memory that can last for years before the battery needs to be replaced. the idea is that there is a main power supply that is used to interface the chip but when the power goes the batery automaticly kicks in and carries on counting. However in this state you cannot interface to the chip
I'd recommend a DS1307 RTC ic. It has battery backed memory that can last for years before the battery needs to be replaced. the idea is that there is a main power supply that is used to interface the chip but when the power goes the batery automaticly kicks in and carries on counting. However in this state you cannot interface to the chip
As this module is intended to be produced in large quantities, I’m looking for a low-cost solution.
It would be cheaper to purchase the chip and its peripheral parts than buying the whole module.
As for I2C, I believe it would be wiser to use SPI as the Uc supports it and does most of the work for the programmer.