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PCF2127AT Datasheet(PDF) 70 Page - NXP Semiconductors |
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PCF2127AT Datasheet(HTML) 70 Page - NXP Semiconductors |
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70 / 100 page  PCF2127 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet Rev. 8 — 19 December 2014 70 of 100 NXP Semiconductors PCF2127 Accurate RTC with integrated quartz crystal for industrial applications 9.3 Bus communication and battery backup operation To save power during battery backup operation (see Section 8.6.1), the bus interfaces are inactive. Therefore the communication via I2C- or SPI-bus should be terminated before the supply of the PCF2127 is switched from VDD to VBAT. The extra power fail detection function (see Section 8.6.3) of the PCF2127 allows early detection of a dropping VDD. The output on pin PFO indicates to the microcontroller to terminate the bus communication properly. When the bus communication is not terminated in a proper way, the time counters get corrupted. Remark: If the I2C-bus communication was terminated uncontrolled, the I2C-bus has to be reinitialized by sending a STOP followed by a START after the device switched back from battery backup operation to VDD supply operation. Fig 47. Bus protocol, reading from RAM |
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