LPC12D27 - pinning questions

[lpcware]

Content originally posted in LPCWare by MX21 on Mon Feb 27 20:33:10 MST 2012
I'm looking at using this chip in a design, but have two questions:

1) The datasheet doesn't say: are the LCD_SCL and LCD_SDA pins internally connected to the processor SCL and SDA pins? Or do they need to be wired externally?

2) Section 7.2.5.1 says that I can drive the LCD using the internal oscillator by connecting pin OSC to pin VSS(LCD). I can't find pin OSC in the pinning information. Is this already done internally?

Thanks,

MX

[lpcware]

Content originally posted in LPCWare by MX21 on Thu Mar 01 22:37:36 MST 2012

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Quote: kendwyer
What NXP support did you try - nxp.com ?

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Yes, http://www.classic.nxp.com/techsupport/index.php.  I have several outstanding tech support tickets after several weeks.

[lpcware]

Content originally posted in LPCWare by MX21 on Thu Mar 01 22:36:06 MST 2012

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Quote: Rob65
I found the information very clear.

On page 1 of the PDF:
and then on page 4 there is a nice picture showing the I2C pins of the lpc1227 and the pcf8576 being brought out separately.

Rob

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Well, I've been burned before by believing simplified block diagrams.  They tend not to show every single connection.
Looking at the manual, figure 3 page 6, shows the OSC pin being brought out, but it actually does not.

[lpcware]

Content originally posted in LPCWare by kendwyer on Thu Mar 01 02:03:09 MST 2012

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Quote: MX21
Is this the right place to ask this?  NXP tech support does not respond either.

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What NXP support did you try - nxp.com ?

[lpcware]

Content originally posted in LPCWare by Rob65 on Wed Feb 29 11:22:59 MST 2012
I found the information very clear.

On page 1 of the PDF:

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Quote:
The LPC12D27 is a dual-chip module consisting of a LPC1227 single-chip microcontroller combined with a PCF8576D Universal LCD driver

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and then on page 4 there is a nice picture showing the I2C pins of the lpc1227 and the pcf8576 being brought out separately.

Rob

[lpcware]

Content originally posted in LPCWare by atomicdog on Wed Feb 29 00:04:11 MST 2012

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Quote: MX21
Is this the right place to ask this?  NXP tech support does not respond either.

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Yeah, this is probable the best place to ask.

I'm guessing not enough people are using that IC yet.
I could be wrong and I'm too lazy to double check but I have a vague recollection of looking at the IC a while ago and it looked to me that you needed to connect the I2C pins externally.

[lpcware]

Content originally posted in LPCWare by MX21 on Tue Feb 28 20:05:32 MST 2012
Is this the right place to ask this?  NXP tech support does not respond either.