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In DS12887, when the external source is turned-off, how does DS12887 get power to retain its data?

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In DS12887, when the external source is turned-off, how does DS12887 get power to retain its data?

(a) Internal Lithium Battery

(b) Internal Lead Battery

(c) Additional external Alkaline Battery

(d) Additional external Lithium Battery

I have been asked this question in exam.

My question is from Interfacing with RTC topic in section 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Right option is (a) Internal Lithium Battery

To explain: When Vcc falls below 3V or external voltage source is switched-off, internal lithium battery provides power to DS12887. And this will prevent loss of data.

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