PCF2127ATSLASH1 datasheet(80/80 Pages) NXP

80 / 80 page

NXP Semiconductors

PCF2127A

Integrated RTC, TCXO and quartz crystal

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 7 May 2010

Document identifier: PCF2127A_2

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section ‘Legal information’.

Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

9.1

SPI-bus interface . . . . . . . . . . . . . . . . . . . . . . 55

9.1.1

Data transmission . . . . . . . . . . . . . . . . . . . . . . 55

9.2

I2C-bus interface. . . . . . . . . . . . . . . . . . . . . . . 57

9.2.1

Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

9.2.2

START and STOP conditions . . . . . . . . . . . . . 57

9.2.3

System configuration . . . . . . . . . . . . . . . . . . . 57

9.2.4

Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 58

9.2.5

I2C-bus protocol . . . . . . . . . . . . . . . . . . . . . . . 58

Internal circuitry. . . . . . . . . . . . . . . . . . . . . . . . 62

Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 63

Static characteristics . . . . . . . . . . . . . . . . . . . . 64

12.1

Current consumption characteristics, typical . 66

12.2

Frequency characteristics. . . . . . . . . . . . . . . . 68

Dynamic characteristics . . . . . . . . . . . . . . . . . 69

13.1

SPI-bus timing characteristics . . . . . . . . . . . . 69

13.2

I2C interface timing characteristics . . . . . . . . . 71

Application information. . . . . . . . . . . . . . . . . . 72

Package outline . . . . . . . . . . . . . . . . . . . . . . . . 73

Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 74

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Revision history . . . . . . . . . . . . . . . . . . . . . . . . 76

Legal information. . . . . . . . . . . . . . . . . . . . . . . 77

20.1

Data sheet status . . . . . . . . . . . . . . . . . . . . . . 77

20.2

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

20.3

Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

20.4

Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Contact information. . . . . . . . . . . . . . . . . . . . . 78

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

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