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PCF2131 Folha de dados(PDF) 19 Page - NXP Semiconductors

Nome de Peças PCF2131
Descrição Electrónicos  Nano-power highly accurate RTC with integrated quartz crystal
PDF  85 Pages
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Fabricante Electrônico  NXP [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF2131 Folha de dados(HTML) 19 Page - NXP Semiconductors

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NXP Semiconductors
PCF2131
Nano-power highly accurate RTC with integrated quartz crystal
001aaj311
internal operating voltage (Voper(int))
cleared via interface
backup battery operation
BF
Vth(sw)bat
(= 2.5 V)
VDD (= 0 V)
VBAT
VDD
Voper(int)
Voper(int)
INT
Vth(sw)bat is the battery switch threshold voltage. Typical value is 2.5 V. In standard mode, the battery switch-over works
only for VDD > 2.5 V.
VDD may be lower than VBAT (for example VDD = 3 V, VBAT = 4.1 V).
Figure 4. Battery switch-over behavior in standard mode with bit BIE set logic 1 (enabled)
7.5.1.2 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.
PCF2131
All information provided in this document is subject to legal disclaimers.
© 2023 NXP B.V. All rights reserved.
Product data sheet
Rev. 2.0 — 5 October 2023
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