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PCF8564A Datasheet(PDF) 17 Page - NXP Semiconductors

Part # PCF8564A
Description  Nano-power highly accurate RTC with integrated quartz crystal for automotive applications
PDF  86 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8564A Datasheet(HTML) 17 Page - NXP Semiconductors

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NXP Semiconductors
PCA2131
Nano-power highly accurate RTC with integrated quartz crystal for automotive applications
AO[3:0]
Decimal
Binary
ppm
0
0000
+16
1
0001
+14
2
0010
+12
3
0011
+10
4
0100
+8
5
0101
+6
6
0110
+4
7
0111
+2
8
1000
[1] 0
9
1001
-2
10
1010
-4
11
1011
-6
12
1100
-8
13
1101
-10
14
1110
-12
15
1111
-14
Table 21. Frequency correction at 25 °C, typical
[1]
Default value.
7.5 Power management functions
The PCA2131 has two power supplies:
VDD - the main power supply
VBAT - the battery backup supply
Internally, PCA2131 operates with the internal operating voltage Voper(int) which is also
available as VBBS on the battery backed output voltage pin, BBS. Depending on the
condition of the main power supply and the selected power management function,
Voper(int) is either on the potential of VDD or VBAT.
Two power management functions are implemented:
Battery switch-over function - monitors the main power supply VDD and switching to
VBAT in case a power fail condition is detected (see Section 7.5.1).
Battery low detection function - monitors the status of the battery, VBAT (see
Section 7.5.2).
The power management functions are controlled by the control bits PWRMNG[2:0] (see
Table 22) in register Control_3 (see Table 10):
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
17 / 86



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