Lpc2000

--- In lpc2000@yahoogroups.com, "javida13" <javida13@y...> wrote:

Oohs, 4-bits of a 5x4 keypad (4+12=16).

I have no need for the other parts in the family.  I need to read in
> 5-bits of a 5x4 keypad and 12-bits of a 12-position rotation switch
> (5+12=16).
> 
> I'm using a Ramtron I2C memory device for my external memory
> requirements and RTC.  The part that I'm considering is a FM3164-S.
 I
>  just checked out the memory section and starting on the RTC.
> 
>   Barry
> 
> --- In lpc2000@yahoogroups.com, "David Kay" <david.kay@a...> wrote:
> > Hi Barry,
> > 
> > I just happened to have the Philips I2C bus selection guide open
on
> my
> > desktop. Have you looked at the other devices in the range:-
> > 
> > ################################################
> > 
> > I2C General-purpose I/O (GPIO) Expanders
> > 




> > - Extend GPIO from I2C or SMBus
> > 
> > - Connect parallel I/O to serial I2C or SMBus
> > and provide I/O expansion
> > 
> > - Quasi output: upper transistor is on for half
> > a clock cycle and then held up by a weak
> > current source (25-mA sink)
> > 
> > - True Output: configurable as input or output
> > with polarity inversion (push/pull with
> > 25-mA sink and 10-mA source)
> > 
> 
> 
> > Quasi Output (Weak Current Source)
> > 
> > PCA9500 8-bit with 2-kbit EEPROM
> > PCA9501 8-bit with 2-kbit EEPROM, Interrupt
> > PCA9558 8-bit w/ 5-bit DIP, 2-kbit EEPROM
> > PCF8574/74A 8-bit with Interrupt
> > PCF8575/75C 16-bit with Interrupt
> > 
> > True Output (Configurable Push/Pull)
> > 
> > PCA9536 4-bit with Interrupt
> > PCA9537 4-bit with Interrupt, Reset
> > PCA9538 8-bit with Interrupt, Reset
> > PCA9539 16-bit with Interrupt, Reset
> > PCA9534/54/54A 8-bit with Interrupt
> > PCA9535/55 16-bit with Interrupt
> > PCA9557 8-bit with Reset
> > 
> > ############################################
> > 
> > Samples of any of these devices should be easy to source from your
> local
> > Philips Disti.
> > 
> > Best regards,
> > 
> > David Kay
> > www.adilam.com.au
> >  
> > 
> > -----Original Message-----
> > From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On
> Behalf
> > Of javida13
> > Sent: Tuesday, 6 September 2005 12:45 p.m.
> > To: lpc2000@yahoogroups.com
> > Subject: [lpc2000] Port Expander
> > 
> > I'm looking for an I2C Port Expander for both 8 and 16-bits,
> > preferably with light pull-ups when configured as inputs.
> > 
> > I have found two possible devices:
> >   Philips  PCA9555  (16-bits with pull-ups)
> >   Microchip MCP23016 (16-bits w/o pull-ups)
> >             MCP23008 (8-bits w/o pull-ups)
> > 
> > I was able to get some samples of the Microchip part but I'm
having
> a
> > problem with the Philips.  Anyone have experience with using a
port
> > expander and if so, what device was chosen?
> > 
> > Thanks,
> >   
> >   Barry
> > 
> > 
> > 
> > 
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