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PCF2123TS Datasheet(PDF) 44 Page - NXP Semiconductors |
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PCF2123TS Datasheet(HTML) 44 Page - NXP Semiconductors |
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44 / 63 page  PCF2123 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 5 — 27 April 2011 44 of 63 NXP Semiconductors PCF2123 SPI Real time clock/calendar 14. 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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