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PCF2123 Datasheet(PDF) 37 Page - NXP Semiconductors

Part # PCF2123
Description  SPI Real time clock/calendar
PDF  54 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2123 Datasheet(HTML) 37 Page - NXP Semiconductors

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PCF2123_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 19 November 2008
37 of 54
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
The watchdog is implemented to prevent the excessive loss of time due to interface
access failure e.g. if main power is removed from a battery backed-up system during an
interface access.
Each time the watchdog period is exceeded, 1 s will be lost from the time counters. The
watchdog will trigger between 1 s and 2 s after receiving a valid subaddress.



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