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PCF2127T/2Y 数据表(PDF) 21 Page - NXP Semiconductors |
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PCF2127T/2Y 数据表(HTML) 21 Page - NXP Semiconductors |
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21 / 100 page  PCF2127 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 8 — 19 December 2014 21 of 100 NXP Semiconductors PCF2127 Accurate RTC with integrated quartz crystal for industrial applications 8.6.1.2 Direct switching mode If VDD > VBAT: Voper(int) is at VDD potential. If VDD < VBAT: Voper(int) is at VBAT potential. The direct switching mode is useful in systems where VDD is always higher than VBAT. This mode is not recommended if the VDD and VBAT values are similar (for example, VDD = 3.3 V, VBAT 3.0 V). In direct switching mode, the power consumption is reduced compared to the standard mode because the monitoring of VDD and Vth(sw)bat is not performed. 8.6.1.3 Battery switch-over disabled: only one power supply (VDD) When the battery switch-over function is disabled: • The power supply is applied on the VDD pin • The VBAT pin must be connected to ground • Voper(int) is at VDD potential • The battery flag (BF) is always logic 0 Fig 7. Battery switch-over behavior in direct switching mode with bit BIE set logic 1 (enabled) |
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