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PCF2127AT/1 Datasheet(PDF) 19 Page - NXP Semiconductors |
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PCF2127AT/1 Datasheet(HTML) 19 Page - NXP Semiconductors |
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19 / 80 page  PCF2127A_2 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 02 — 7 May 2010 19 of 80 NXP Semiconductors PCF2127A Integrated RTC, TCXO and quartz crystal 8.6.1.2 Direct switching mode If VDD > VBAT the internal power supply is VDD. If VDD < VBAT the internal power supply is VBAT. Fig 4. Battery switch-over behavior in standard mode with bit BIE set logic 1 (enabled) 001aaj311 internal power supply (= VBBS) cleared via interface backup battery operation BF Vth(sw)bat (= 2.5 V) VDD (= 0 V) VBAT VDD VBBS VBBS INT Fig 5. Battery switch-over behavior in direct switching mode with bit BIE set logic 1 (enabled) 001aaj312 internal power supply (= VBBS) cleared via interface backup battery operation BF Vth(sw)bat (= 2.5 V) VDD (= 0 V) VBAT VDD VBBS VBBS INT |
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