Microcontrollers forget the time the moment they lose power. This keeps counting on a coin cell for years, and hands the date back over I2C when the board wakes up.
Specifications
| Chip | DS1307ZN |
| Interface | I2C (0x68) |
| Backup | CR2032 coin cell (not included) |
| Accuracy | +/-2 s per day at 25 C |
| Extras | 56 bytes of battery-backed NVRAM |
| Operating voltage | 5 V |
Backordered - order now and it ships within 10 working days.
