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PCA2125TS Datasheet(PDF) 32 Page - NXP Semiconductors |
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PCA2125TS Datasheet(HTML) 32 Page - NXP Semiconductors |
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32 / 40 page  PCA2125_00 © NXP B.V. 2007. All rights reserved. Preliminary data sheet Rev. 00.11 — 30 January 2007 32 of 40 NXP Semiconductors PCA2125 SPI Real time clock / calendar 10. Application information Fig 21. SPI interface timing 001aaf917 R/W SA2 RA0 b7 b6 b0 b7 b6 b0 b0 b6 b7 SDI SDO SDO Hi Z Hi Z SDI SCL CE WRITE READ tWCE 80% 20% tWL tRF tCEH tCER tRZ tRD tZZ tRF tDH tDS tWH tCES tCYC The 1 Farad capacitor is used as a standby/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 22. Application diagram. 001aaf918 OSCI 1 F supercap OSCO INT VSS VDD CLKOUT CE SCL SDI SDO PCA2125 |
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