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PCF2127T/2Y Datasheet(PDF) 70 Page - NXP Semiconductors

Part # PCF2127T/2Y
Description  Accurate RTC with integrated quartz crystal for industrial applications
PDF  100 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF2127T/2Y Datasheet(HTML) 70 Page - NXP Semiconductors

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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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