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PCA2125 Datasheet(PDF) 36 Page - NXP Semiconductors

Part # PCA2125
Description  SPI Real-time clock/calendar
PDF  36 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA2125 Datasheet(HTML) 36 Page - NXP Semiconductors

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NXP Semiconductors
PCA2125
SPI Real-time clock/calendar
© NXP B.V. 2008.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 28 July 2008
Document identifier: PCA2125_1
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
22. Contents
1
General description . . . . . . . . . . . . . . . . . . . . . . 1
2
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
3
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
4
Ordering information . . . . . . . . . . . . . . . . . . . . . 1
5
Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
6
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
7
Pinning information . . . . . . . . . . . . . . . . . . . . . . 3
7.1
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
7.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3
8
Functional description . . . . . . . . . . . . . . . . . . . 3
8.1
Register overview . . . . . . . . . . . . . . . . . . . . . . . 4
8.2
Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
8.2.1
Power-on reset override . . . . . . . . . . . . . . . . . . 6
8.3
Control registers . . . . . . . . . . . . . . . . . . . . . . . . 7
8.4
Time and date function . . . . . . . . . . . . . . . . . . . 8
8.5
Alarm function. . . . . . . . . . . . . . . . . . . . . . . . . 10
8.5.1
Alarm flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.6
Timer functions . . . . . . . . . . . . . . . . . . . . . . . . 13
8.6.1
Second and minute interrupt. . . . . . . . . . . . . . 13
8.6.2
Countdown timer function . . . . . . . . . . . . . . . . 15
8.6.3
Timer flags . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.7
Interrupt output . . . . . . . . . . . . . . . . . . . . . . . . 17
8.7.1
Minute and second interrupts . . . . . . . . . . . . . 18
8.7.2
Countdown timer interrupts. . . . . . . . . . . . . . . 19
8.7.3
Alarm interrupts . . . . . . . . . . . . . . . . . . . . . . . 20
8.8
Clock output . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.9
External clock test mode. . . . . . . . . . . . . . . . . 21
8.10
STOP bit function . . . . . . . . . . . . . . . . . . . . . . 22
8.11
3-line SPI . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9
Internal circuitry. . . . . . . . . . . . . . . . . . . . . . . . 26
10
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 26
11
Static characteristics. . . . . . . . . . . . . . . . . . . . 27
12
Dynamic characteristics . . . . . . . . . . . . . . . . . 28
13
Application information. . . . . . . . . . . . . . . . . . 30
13.1
Application diagram . . . . . . . . . . . . . . . . . . . . 30
13.2
Quartz frequency adjustment . . . . . . . . . . . . . 30
14
Test information . . . . . . . . . . . . . . . . . . . . . . . . 30
14.1
Quality information . . . . . . . . . . . . . . . . . . . . . 30
15
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 31
16
Handling information. . . . . . . . . . . . . . . . . . . . 32
17
Soldering of SMD packages . . . . . . . . . . . . . . 32
17.1
Introduction to soldering . . . . . . . . . . . . . . . . . 32
17.2
Wave and reflow soldering . . . . . . . . . . . . . . . 32
17.3
Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 32
17.4
Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 33
18
Revision history . . . . . . . . . . . . . . . . . . . . . . . 34
19
Legal information . . . . . . . . . . . . . . . . . . . . . . 35
20
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 35
20.1
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
20.2
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 35
20.3
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 35
21
Contact information . . . . . . . . . . . . . . . . . . . . 35
22
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36



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