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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCF2129AT датащи(PDF) 21 Page - NXP Semiconductors |
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PCF2129AT датащи(HTML) 21 Page - NXP Semiconductors |
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21 / 86 page  PCF2129 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 7 — 19 December 2014 21 of 86 NXP Semiconductors PCF2129 Accurate RTC with integrated quartz crystal for industrial applications 8.5.3 Battery backup supply The VBBS voltage on the output pin BBS is at the same potential as the internal operating voltage Voper(int), depending on the selected battery switch-over function mode: The output pin BBS can be used as a supply for external devices with battery backup needs, such as SRAM (see Ref. 3 “AN11186”). For this case, Figure 10 shows the typical driving capability when VBBS is driven from VDD. Fig 9. Battery low detection behavior with bit BLIE set logic 1 (enabled) Table 20. Output pin BBS Battery switch-over function mode Conditions Potential of Voper(int) and VBBS standard VDD > VBAT OR VDD > Vth(sw)bat VDD VDD < VBAT AND VDD < Vth(sw)bat VBAT direct switching VDD > VBAT VDD VDD < VBAT VBAT disabled only VDD available, VBAT must be put to ground VDD |
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