31 Jul 2010 7:11:39
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 Acqura now have Philips microcontrollers available for sale. If you need P89C668, P89C669, LPC76x or LPC900 family devices, check out our low MOQ's
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Take a look at our new forums. If you have a question about the 8xC51, LPC900, or MX families (or any 8051-related query) then ask your question here.
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| User Support has posted this comment in the Power Management Forum |
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| Minimising power consumption in the LPC9xx family (a little known, but important, fact) |
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Hello all LPC9xx users,
I have seen some postings from LPC9xx users that indicate that even after removing power to certain peripheral blocks through the PCONA register device consumption is still higher than expected.
The trick is to also disable the watchdog oscillator - which is actually configured to run from reset.
The following code segment will achieve this:
mov wdcon, #00000000b ; stop watchdog, clear WDTOF
mov wfeed1, #0A5h
mov wfeed2, #05Ah ; control flags take effect
A customer of ours using a LPC922 recently experienced this problem. With everything disabled in PCONA and the ports appropriately configured he was still experiencing a current draw of about 40uA (in total power down). After including the above code segment the device current draw dropped to 140nano Amps!
Best regards,
Graham
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| Click here to see the whole discussion thread. |
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