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Battery protection for PCF85263A

Question asked by Frans Jan van Donselaar on Dec 18, 2017
Latest reply on Feb 8, 2018 by Pieter Simons

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Does a battery (CR2032 button cell) need extra protection like a diode and current limiting resistor when this battery is connected to the PCF85263A? The explanation of the battery switch circuit inside the PCF85263A is very minimal.

Additional question: What is the leakage current on VBAT when VDD is active?

The typical application (datasheet):

Needed according to UL:

Proposed application:

Thanks,

Frans Jan

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Tomas Vaverka Dec 18, 2017 5:09 AM
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Hello Frans Jan,

Please refer to the UM10301 (Chapter 13) with a detailed description of this topic.

Best regards,
Tomas
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- Pieter Simons @ Tomas Vaverka on Feb 8, 2018 2:46 AM
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  Hello Tomas;
  I''m interested in the PCF85263A too.
  In UM10301 is stated on page 30:
  All RTCs in this manual incorporate neither a dedicated switch-over circuit nor a charger and therefore this has to be realized with some external components.
  
  The PCF85263A has a switch over circuit.
  What is the leakage current on VBAT when VDD is active?
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Battery protection for PCF85263A

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