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TI Home » TI E2E Community » Support Forums » Low Power RF & Wireless Connectivity » Low Power RF Bluetooth® Low Energy & ANT Forum » CC2540 External Reference Pin Out and Memory Block Size Question
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CC2540 External Reference Pin Out and Memory Block Size Question

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Mike Dielman
Posted by Mike Dielman
on Oct 18 2010 11:07 AM
Prodigy325 points

Two questions:

1.

I would like to use the an existing external 2.2V reference for the on chip ADC.  What is the correct pin to use for this?   Based upon the user guide and data sheet it looks like AIN7 is used for an external 2.500 Voltage reference (with a 3 Volt VCC for the chip).  Can you please comment on this?

2.

In the documentation the Flash memory Block size is not explicitly stated. I am guessing that it is a 1k Block for 128k Flash and a 2k Block for 256k Flash.  Could you please verify that this is the case or provide additional details on this?

Thanks for your help

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  • MaMoe
    Posted by MaMoe
    on Oct 18 2010 12:27 PM
    Verified Answer
    Verified by Mike Dielman
    Intellectual795 points

    To answer your question #2. The page size of the flash is 2kB regardless of the total flash size

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  • Karl T.
    Posted by Karl T.
    on Oct 18 2010 13:25 PM
    Expert3500 points

    Mike,

    On question 1), yes, you should connect your external 2.2V reference to AIN7. Make sure to select AIN7 as a reference rather than the internal one (ADCON2).

    Karl

    CC2540 ADC
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