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PCF8564A 数据表(PDF) 20 Page - NXP Semiconductors

部件名 PCF8564A
功能描述  Nano-power highly accurate RTC with integrated quartz crystal for automotive applications
PDF  86 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

PCF8564A 数据表(HTML) 20 Page - NXP Semiconductors

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NXP Semiconductors
PCA2131
Nano-power highly accurate RTC with integrated quartz crystal for automotive applications
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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
Figure 5. Battery switch-over behavior in direct switching mode with bit BIE set logic 1
(enabled)
7.5.1.3 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
7.5.1.4 Battery switch-over architecture
The architecture of the battery switch-over circuit is shown in Figure 6.
001aag061
Vth(sw)bat
VDD
Voper(int)
VDD
VBAT
LOGIC
comparators
logic
switches
Vth(sw)bat
VBAT
Figure 6. Battery switch-over circuit, simplified block diagram
Voper(int) is at VDD or VBAT potential.
Remark: It has to be assured that there are decoupling capacitors on the pins VDD, VBAT,
and BBS.
7.5.2 Battery low detection function
The PCA2131 has a battery low detection circuit which monitors the status of the battery
VBAT.
PCA2131
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Product data sheet
Rev. 1.0 — 26 July 2021
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