PCF2129AT datasheet(31/86 Pages) PHILIPS

Part #	PCF2129AT

Description	Accurate RTC with integrated quartz crystal for industrial applications

PDF	86 Pages

Scroll/Zoom	100%

Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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31 / 86 page

PCF2129

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Product data sheet

Rev. 7 — 19 December 2014

31 of 86

NXP Semiconductors

PCF2129

Accurate RTC with integrated quartz crystal for industrial applications

As a consequence of this method, it is very important to make a read or write access in

one go. That is, setting or reading seconds through to years should be made in one single

access. Failing to comply with this method could result in the time becoming corrupted.

As an example, if the time (seconds through to hours) is set in one access and then in a

second access the date is set, it is possible that the time may increment between the two

accesses. A similar problem exists when reading. A roll-over may occur between reads

thus giving the minutes from one moment and the hours from the next. Therefore it is

advised to read all time and date registers in one access.

Fig 16. Access time for read/write operations

PCF2129AT Datasheet(PDF) 31 Page - NXP Semiconductors