PCA2125 Datasheet, PDF (1/40 Pages) NXP Semiconductors – SPI Real time clock / calendar

PCA2125
SPI Real time clock / calendar
Rev. 00.11 — 30 January 2007
Preliminary data sheet
1. Product profile
1.1 General description
The PCA2125 is a CMOS real time clock/calendar optimized for low power consumption
and 125 °C operation. Data is transferred serially via an SPI bus with a maximum data
rate of 8.0 Mbits/s. An alarm and timer function are also available with possibility to
generate a wake-up signal on an interrupt pin.
1.2 Features
„ Provides year, month, day, weekday, hours, minutes and seconds based on
32.768 kHz quartz crystal
„ Resolution: seconds - years
„ Clock operating voltage: 1.2 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 with separate combinable data input and output
„ Serial interface (at V_DD = 1.8 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 capacitor
„ Internal power-on reset
„ Open-drain interrupt pin
1.3 Applications
„ Automotive time keeping application
„ Metering
1.4 Quick reference data
Table 1.
Symbol
V_DD
Quick reference data
Parameter
supply voltage
Conditions
SPI bus inactive; T_amb = 25 °C
SPI bus active; T_amb = −40 to +125 °C
Min Typ Max Unit
1.2 -
5.5 V
1.6 -
5.5 V