Datasheet Details
| Part number | PCF2123 |
|---|---|
| Manufacturer | NXP Semiconductors |
| File Size | 839.21 KB |
| Description | SPI Real time clock/calendar |
| Datasheet |
 PCF2123 Datasheet
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General Description
The PCF2123 is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low power applications.
Data is transferred serially via a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.25 Mbit/s.
Key Features
- Real time clock provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal.
- Low backup current while running: typical 100 nA at VDD = 2.0 V and Tamb = 25 C.
- Resolution: seconds to years.
- Watchdog functionality.
- Freely programmable timer and alarm with interrupt capability.
- Clock operating voltage: 1.1 V to 5.5 V.
- 3 line SPI-bus with separate, but combinable data input and output.
- Serial interface at VDD = 1.8 V t.