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PCF2127T/2Y Datasheet(PDF) 100 Page - NXP Semiconductors |
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PCF2127T/2Y Datasheet(HTML) 100 Page - NXP Semiconductors |
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100 / 100 page ![]() NXP Semiconductors PCF2127 Accurate RTC with integrated quartz crystal for industrial applications © NXP Semiconductors N.V. 2014. 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: 19 December 2014 Document identifier: PCF2127 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. 8.13.8 Battery low detection interrupts . . . . . . . . . . . 58 8.14 External clock test mode . . . . . . . . . . . . . . . . 59 8.15 STOP bit function . . . . . . . . . . . . . . . . . . . . . . 59 9 Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 9.1 SPI-bus interface . . . . . . . . . . . . . . . . . . . . . . 62 9.1.1 Data transmission . . . . . . . . . . . . . . . . . . . . . . 63 9.2 I2C-bus interface. . . . . . . . . . . . . . . . . . . . . . . 66 9.2.1 Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 9.2.2 START and STOP conditions . . . . . . . . . . . . . 66 9.2.3 System configuration . . . . . . . . . . . . . . . . . . . 66 9.2.4 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 67 9.2.5 I2C-bus protocol . . . . . . . . . . . . . . . . . . . . . . . 67 9.3 Bus communication and battery backup operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 10 Internal circuitry. . . . . . . . . . . . . . . . . . . . . . . . 71 11 Safety notes . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 12 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 72 13 Static characteristics . . . . . . . . . . . . . . . . . . . . 73 13.1 Current consumption characteristics, typical . 75 13.2 Frequency characteristics. . . . . . . . . . . . . . . . 78 14 Dynamic characteristics . . . . . . . . . . . . . . . . . 80 14.1 SPI-bus timing characteristics . . . . . . . . . . . . 80 14.2 I2C-bus timing characteristics . . . . . . . . . . . . . 82 15 Application information. . . . . . . . . . . . . . . . . . 84 16 Test information . . . . . . . . . . . . . . . . . . . . . . . . 84 16.1 Quality information . . . . . . . . . . . . . . . . . . . . . 84 17 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 85 18 Packing information . . . . . . . . . . . . . . . . . . . . 87 18.1 Tape and reel information . . . . . . . . . . . . . . . . 87 19 Soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 19.1 Footprint information. . . . . . . . . . . . . . . . . . . . 87 20 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 20.1 Real-Time Clock selection . . . . . . . . . . . . . . . 89 21 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 91 22 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 23 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 93 24 Legal information. . . . . . . . . . . . . . . . . . . . . . . 94 24.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 94 24.2 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 24.3 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 24.4 Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 95 25 Contact information. . . . . . . . . . . . . . . . . . . . . 95 26 Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 27 Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 28 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 |
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