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PCF2123TS Datasheet(PDF) 41 Page - NXP Semiconductors

Part # PCF2123TS
Description  SPI Real time clock/calendar
PDF  55 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2123TS Datasheet(HTML) 41 Page - NXP Semiconductors

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PCF2123_2
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 — 4 December 2009
41 of 55
NXP Semiconductors
PCF2123
SPI Real time clock/calendar
13. Application information
A 1 farad super capacitor combined with a low VF diode can be used as a standby or back-up
supply. With the RTC in its minimum power configuration i.e. timer off and CLKOUT off, the RTC
may operate for weeks.
Fig 29. Typical application diagram
001aai557
CLKOE
VDD
CLKOUT
VSS
OSCI
OSCO
CE
SCL
SDI
SDO
PCF2123
INT
100 nF
1 F
supercapacitor



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