Standby mode ?

inaki

Hi.
I have made a remote controller with an SX28. It works but I would like to keep it ON all time the way other remote controllers work (currently I have a ON/OFF switch). It should enter low power mode if not used for some seconds and wake up when any button is pressed.

Does SX28 support standaby mode or some sort of low power state ?
If so, how is it implemented ? Any example out there ?

If there is no specific support for this on chip, any other idea on how to implement such feature?.






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Beau Schwabe

Here is a link to a Low Current Standby technique using a BS2 consuming less than 3nA in standby mode.
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I designed this and used it for a·"doorbell" in my daughter's playhouse.· A rechargeable 9V battery (7.2V)
would last about 8 months.
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You could cleverly implement this in a keypad instead of just the single switch setup I have.
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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Guenther Daubach

You may also use the SX sleep instruction to bring it in low power mode, and configure any of the port B pins as an input causing a wake-up on either a rising, or falling signal edge, depending on the button circuitry you are using.

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Greetings from Germany,

G

inaki

Guenther, does this technique work sith SX Basic or should I implement it in assembler ?
In your SX book I could not find any example. Have I missed it ?

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Guenther Daubach

inaki,

this works with SXB as well - see the SLEEP instruction in the on-line help. You are right, in my book, there is no example for the sleep instruction. You will find some information about how to configure port B inputs for wake-up on page 97.

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Greetings from Germany,

G