PCA21125 Datasheet, PDF (1/42 Pages) NXP Semiconductors – SPI-bus Real-Time Clock and calendar

PCA21125
SPI-bus Real-Time Clock and calendar
Rev. 01 — 16 November 2009
Product data sheet
1. General description
The PCA21125 is a CMOS¹ Real-Time Clock (RTC) and calendar optimized for low-power
consumption and an operating temperature up to 125 °C. Data is transferred via a Serial
Peripheral Interface (SPI-bus) with a maximum data rate of 6.0 Mbit/s. Alarm and timer
functions are also available with the possibility to generate a wake-up signal on the
interrupt pin.
AEC Q100 compliant for automotive applications.
2. Features
„ Provides year, month, day, weekday, hours, minutes, and seconds based on
32.768 kHz quartz crystal
„ Resolution: seconds to years
„ Clock operating voltage: 1.3 V to 5.5 V
„ Low backup current: typical 0.55 μA at V_DD = 3.0 V and T_amb = 25 °C
„ 3-line SPI-bus with separate, but combinable data input and output
„ Serial interface at V_DD = 1.6 V to 5.5 V
„ 1 second or 1 minute interrupt output
„ Freely programmable timer with interrupt capability
„ Freely programmable alarm function with interrupt capability
„ Integrated oscillator capacitors
„ Internal Power-On Reset (POR)
„ Open-drain interrupt pin
3. Applications
„ Automotive time keeping
„ Metering
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.