| Pin |
Symbol |
Description |
| 1 | VCC2 | Primary power supply pin in dual supply configuration. When VCC2 is greater than VCC1 + 0.2V VCC2 power the chip. When VCC2 is less than VCC1, VCC1 powers the chip. |
| 2 | X1 | Connection for standard 32.768kHz Quartz crystal. |
| 3 | X2 | Connection for standard 32.768kHz Quartz crystal. |
| 4 | GND | Ground |
| 5 | CE | Chip enable signal must be asserted high during a read or a write. |
| 6 | I/O | The I/O pin is the bidirectional data pin for the 3-Wire interface. |
| 7 | SCLK | SCLK is used to synchronize data movement on the serial interface. |
| 8 | VCC1 | The rechargeable source is connected to this pin. |
