PCF2127T Ver la hoja de datos (PDF) - NXP Semiconductors.
Número de pieza
componentes Descripción
Fabricante
PCF2127T Datasheet PDF : 101 Pages
| |||
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.
EDFNXSEDWWHU\RSHUDWLRQ
9''
9RSHU LQW
9%$7
LQWHUQDORSHUDWLQJYROWDJH 9RSHU LQW
9RSHU LQW
9WK VZ EDW
9
9'' 9
%)
,17
FOHDUHGYLDLQWHUIDFH
DDM
Fig 7. Battery switch-over behavior in direct switching mode with bit BIE set logic 1
(enabled)
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
PCF2127
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
21 of 100
Share Link: 