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Forum Index : Microcontroller and PC projects : Witch RTC..?

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Lou

Senior Member

Joined: 01/02/2014
Location: United States
Posts: 229
Posted: 04:37pm 18 May 2014
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Geoff wrote:
Make that the wakeup pin, then you could wake the Micromite from sleep.
On second thought, that would interfere with the use of the pin for decoding IR commands. Maybe another jumper for the IR receiver output?


The PCF8563 INT pin is open drain and the TSOP4838 IR receiver output pin is open collector with a 33k pull up so they should be able to be tied together directly so that either one could wake up the processor with appropriate 'who done it' code. Include a weak pull up resistor in case the IR receiver is not populated.

It seems unlikely both clock and IR would fire at the same time.

Lou
Microcontrollers - the other white meat
 
BobD

Guru

Joined: 07/12/2011
Location: Australia
Posts: 935
Posted: 05:26pm 18 May 2014
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  Lou said  
It seems unlikely both clock and IR would fire at the same time.

Lou


A bit of code could sort out which one it was.

On the subject of the 10mm battery. The only one I could find at 10mm was a CR1025 which has a capacity of 30mA hours. This is one seventh of the CR2032 (about 220mA hours). You may have a battery life which is less than the shelf life especially if using some of the optional RTC features. That may or may not be a limitation.
 
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