RTC simultaneous funtionality

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RTC simultaneous funtionality

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Contributor I

Using a RTC I want to set an interupt to go low every 15 minutes and then stay low for only 10s. Once this is all set in the RTC it needs run autonomously, that is to be all controlled by the RTC. I do not want to use an external MCU/I2C to bring the INT high after 10s. I have programmed a PCF8523 to go low every 15 minutes. And programmed a 10s timer. However I can not get them both to work together in the way described above. Will this work in the PCF8523, or can you suggest another RTC that will?

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NXP TechSupport
NXP TechSupport

Hi Nats,

The PCF8523 does have a programmable alarm and timer with interrupt capability, but does not really allow to combine them to work in the way you require. Unfortunately none of our RTCs is capable to meet your requirements.

Best regards,

Tomas

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Contributor I

This would definitely be possible if the INT1 and INT2 were independent. However, it seems they are not: https://community.nxp.com/message/1004029 

Would be very pleased if these could be separated. I.e. if you could set timer B without raising INT1.

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