Analog Devices
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Extremely accurate I2C real-time clock with an integrated temperature-compensated crystal — about ±2 minutes a year, against the DS1307's several minutes a month.
| Part number | DS3231 |
|---|---|
| Manufacturer | Analog Devices |
| Category | Integrated Circuits › I/O Expander & Bus ICs |
| Package | SOIC-16 |
| Pins | 16 |
DS3231 pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | 32kHz | output | 32.768kHz output |
| 2 | VCC | power | Supply, 2.3–5.5V |
| 3 | INT/SQW | output | Interrupt or square wave out |
| 4 | RST | bidirectional | Reset |
| 5 | NC | nc | Not connected |
| 6 | NC | nc | Not connected |
| 7 | NC | nc | Not connected |
| 8 | NC | nc | Not connected |
| 9 | NC | nc | Not connected |
| 10 | NC | nc | Not connected |
| 11 | NC | nc | Not connected |
| 12 | NC | nc | Not connected |
| 13 | GND | ground | Ground |
| 14 | VBAT | power | Backup battery, typically CR2032 |
| 15 | SDA | bidirectional | I2C data |
| 16 | SCL | bidirectional | I2C clock |
Schematic symbol and footprint
Schematic symbol
Footprint: SOIC-16 — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.