Datasheet

I 2 C-bus Components Selection Guide

Clocks and Real Time Clocks

NXP offers a variety of real-time clocks to suit the many applications requiring accurate time keeping. Options include ultra-low power, high-temperature tolerant, temperature compensated, and high-accuracy versions.

Features

• All addresses and data transferred serially via I 2 C-bus

Applications

• Mobile telephones

• Portable instruments

• Electronic metering

• Battery-powered products

Clocks and Real Time Clocks Selection Guide

Device

PCA8802

PCF8523

PCF8563

PCF85063

PCF85063A

PCA8565

PCF8583

PCF2127A

PCA/PCF2129(A)

Bus

I 2 C Fm

I 2 C Fm+

I 2 C Fm

I 2 C Fm

I 2 C Fm

I 2 C Fm

I 2 C

I 2 C Fm

I 2 C Fm

Feature

Ultra low power Smartcard; integrated counter for initiating one time password generation

Ultra low power with loss of main power detect and auto battery switch over

Ultra low power clock/calendar

Tiny RTC with 30s, 60s interrupt

Tiny RTC with alarm and 30s, 60s interrupt

High temperature (-40˚C – +125˚C) clock/calendar

Clock/calendar resolution 0.01 s with 256x8 SRAM

High-accuracy, low-voltage with 512x8 RAM; temperature compensated

High accuracy; temperature compensated

Precision Timekeeping Doesn’t Have to

Consume Lots of Power

NXP’s PCA2129 Real Time Clock provides precision timekeeping for automotive, electronic metering, GPS equipment, or any other application that requires accurate process timing.

PCA2129

REAL TIME

CLOCK

FEATURES

` AEC-Q100 compliance for automotive applications

` Typical accuracy of ±3 ppm from -30 °C to +80 °C

` 32.768 kHz quartz crystal and oscillator integrated into one convenient package

` Battery backed output voltage and low battery detection

` Temperature compensated crystal oscillator with integrated capacitors

` Year, month, day, weekday, hours, minutes, seconds, and leap year correction

` Programmable interrupts and watchdog timer

` Clock operating voltage of 1.8 V to 4.2 V

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