PCF2123 Datasheet SPI Real time clock/calendar

Manufacturer: NXP Semiconductors

Datasheet Details

The PCF2123 is a CMOS1 Real-Time Clock (RTC) and calendar optimized for low power applications.

Data is transferred serially via a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.25 Mbit/s.

An alarm and timer function is also available providing the possibility to generate a wake-up signal on an interrupt pin.

PCF2123 SPI Real time clock/calendar Rev.

6 — 15 July 2013 Product data sheet 1.

Real time clock provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal.
Low backup current while running: typical 100 nA at VDD = 2.0 V and Tamb = 25 C.
Resolution: seconds to years.
Watchdog functionality.
Freely programmable timer and alarm with interrupt capability.
Clock operating voltage: 1.1 V to 5.5 V.
3 line SPI-bus with separate, but combinable data input and output.
Serial interface at VDD = 1.8 V t.

Part Number	Description
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PCF2127A	TCXO and quartz crystal
PCF2128	Integrated RTC/TCXO/Crystal
PCF2129A	Integrated RTC TCXO and quartz crystal
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PCF84C42A	(PCF84Cx2A) 8-bit microcontrollers
PCF85132	LCD driver
PCF85133	Universal LCD driver
PCF8534	Universal LCD driver
PCF8534A	Universal LCD driver