PCA2125
SPI Real time clock / calendar
Rev. 00.11 鈥?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
擄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
渭A
at V
DD
= 3.0 V and T
amb
= 25
擄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
擄C
SPI bus active; T
amb
=
鈭?0
to +125
擄C
Min
1.2
1.6
Typ
-
-
Max
5.5
5.5
Unit
V
V