Lpc2000

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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