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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PCF2127AT/1 데이터시트(PDF) 24 Page - NXP Semiconductors |
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PCF2127AT/1 데이터시트(HTML) 24 Page - NXP Semiconductors |
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24 / 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 24 of 80 NXP Semiconductors PCF2127A Integrated RTC, TCXO and quartz crystal 8.6.4.2 Extra power fail detection when the battery switch-over function is disabled If the battery switch-over function is disabled and the power fail comparator is enabled, the power fail output at pin PFO depends only on the result of the comparison between VPFI and 1.25 V: • If VPFI > 1.25 V, PFO = HIGH (through the external pull-up resistor) • If VPFI < 1.25 V, PFO = LOW Fig 11. PFO signal behavior when battery switch-over is enabled in direct switching mode and Vth(uvp) < VBAT 001aaj320 internal power supply (= VBBS) comparator enabled comparator disabled comparator enabled Vth(sw)bat (= 2.5 V) Vth(uvp) VDD VBBS VBBS VBAT PF0 trec VDD (= 0 V) Fig 12. PFO signal behavior when battery switch-over is disabled 001aaj321 comparator always enabled Vth(sw)bat (= 2.5 V) VDD Vth(uvp) PF0 |
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