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PCF8523 fiches techniques PDF

NXP Semiconductors - Real-Time Clock (RTC) and calendar

Numéro de référence PCF8523
Description Real-Time Clock (RTC) and calendar
Fabricant NXP Semiconductors 
Logo NXP Semiconductors 





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PCF8523 fiche technique
PCF8523
Real-Time Clock (RTC) and calendar
Rev. 3 — 30 March 2011
Product data sheet
1. General description
The PCF8523 is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low power
consumption. Data is transferred serially via an I2C-bus with a maximum data rate of
1000 kbit/s. Alarm and timer functions are available with the possibility to generate a
wake-up signal on an interrupt pin. An offset register allows fine-tuning of the clock. The
PCF8523 has a backup battery switch-over circuit, which detects power failures and
automatically switches to the battery supply when a power failure occurs.
2. Features and benefits
Provides year, month, day, weekday, hours, minutes, and seconds based on a
32.768 kHz quartz crystal
Resolution: seconds to years
Clock operating voltage: 1.0 V to 5.5 V
Low backup current: typical 150 nA at VDD = 3.0 V and Tamb = 25 C
2 line bidirectional 1 MHz Fast-mode Plus (Fm+) I2C interface
Battery backup input pin and switch-over circuit
Freely programmable timer and alarm with interrupt capability
Selectable integrated oscillator load capacitors for CL = 7 pF or CL = 12.5 pF
Internal Power-On Reset (POR)
Open-drain interrupt or clock output pins
Programmable offset register for frequency adjustment
3. Applications
Time keeping application
Battery powered devices
Metering
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 19.

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