Propstick EEPROM

bboy8012

Can anyone tell me where to find the specs for the EEPROM on the propstick. I am trying to see if I can upgrade it with another SOIC ship. Needing the size, and also has anyone tried to upgrade the EEPROM on the propstick? Thanks

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hover1

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·http://www.parallax.com/Portals/0/Downloads/docs/prod/prop/32210-PropStickUSB-1.2.pdf

·http://ww1.microchip.com/downloads/en/DeviceDoc/21203P.pdf

32K is standard. You can use·64K,·chip to replace it. (24LC512)

Jim

Post Edited (hover1) : 4/5/2010 1:26:41 AM GMT

Mike Green

You don't need to replace the EEPROM on the PropStick unless you have to have a larger EEPROM on-board the module. The EEPROM I/O pins are available and you can simply add another EEPROM to that I2C bus. The 2nd EEPROM would need to have its address select lines set to something other than zero, but that's all. I've hooked up several 128K byte EEPROMs (24LC1024B) that way to get a total of 416K.

bboy8012

Wow I never knew that Mike, thanks. To be correct I can use any I/O pins as the EEPROM pins just like I2C devices or are there specific pins?

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Post Edited (bboy8012) : 4/5/2010 4:14:43 AM GMT

Lucky

P28 - I2C SCL connection to optional, external EEPROM.
P29 - I2C SDA connection to optional, external EEPROM.

-from the Prop Manual

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"The man who smiles when things go wrong has thought of someone to blame it on."


-Lucky[size=-1][/size]

Mike Green

You can actually use any pair of I/O pins for I2C devices. The advantage of using 28/29 is that they're already allocated for that purpose. On the Demo Board, I've set up 4 x 128K byte 24LC1024B EEPROMs for a total of 512K using I/O pins 0/1. The I/O drivers that I wrote (in the Object Exchange) will accept the even numbered I/O pin number of any pair of pins. Some other drivers accept any two I/O pin numbers.