31 Jul 2010 7:14:02
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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 diano has posted this comment in the Serial Forum |
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| I2C with LPC925 and PDS900 |
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Hello,
for testing I use a small LCD with I2C since several years. The software modules run with several targets and LPC922 or PDS900.
Actual I am working with a LPC925 and following problem I cannot solve:
the software modules for I2C run on PDS900 (with P89LPC936, but emulating an LPC925, internal clock) but on the same(!) target there is no useful I2C output with the original LPC925FN (DIP), programmed with ICP. I supposed that it may be correlated with the additional adc on a LPC925-chip, but isolating the I2C-modules brings no success. Its difficult to find an error because it works fine on the same target with an adapted PDS900 instead of an real chip LPC925!
An logic analyzer with I2C-interpreter shows, that the output from PDS900 starts normal with <start> <write:58> ..., but the output of the real chip LPC925 begins with <Start repeated> <GeneralCall>.
The signal SCL is in both cases under 100kHz, more slowering doesnt matter, it seems to be a logical problem.
Does anybody know, if there is a difference of the on chip parts of I2C between LPC936, 922 and LPC925 of the other side? or what do you propose I should try?
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| Click here to see the whole discussion thread. |
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LCP40-44QFP |
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LCPx5x40 Programmer 44-pin QFP Programming adapter for SOT307-2 packages |
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Image not available
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| Related Products |
None |
| PDF |
Datasheet not available |
| Cost |
US $149.00 |
| Quantity Required |
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This programming adaptor is suitable for use with the LCPx5x40 programmer. It is designed to correctly accept devices in the QFP44 (SOT307-2) package, specifically the P87C591, P87C551, P87C553 and the P87C5x families.
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