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'[SX] FM24C64 I2C help'
2006\11\14@133007 by Johnson Rodn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Johnson Rod wrote:

i'm have trouble with my read write routines with my first I2C external memorty application.

i got the code from the sx/b help file but its not working.

any help?
tech doc
http://www.ramtron.com/lib/literature/datasheets/FM24C64ds_r3.0.pdf
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2006\11\14@142941 by daveheinn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, davehein wrote:

The code looks OK to me.  The only thing I see is that you are using a device address of 1.  This should work if you tied the A0 pin high, and the A1 and A2 pins low.

Dave
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2006\11\15@052801 by George Herzogn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Where did you get the FRAM?
I have been hoping to try them out.

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2006\11\15@062106 by Johnson Rodn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Johnson Rod wrote:

actually i have 2 frams on 1 i2c network addressed 0 and 1
mouser. they have a few readily available.

arg so i have a hardware problem!

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2006\11\15@063304 by George Herzogn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

If you have a Propeller, the I2C driver is included as an object and will easily confirm that the FRAMs are okay.

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2006\11\16@060315 by Johnson Rodn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Johnson Rod wrote:

i have a demo board but the frams are soic-8.

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2006\11\16@065604 by daveheinn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, davehein wrote:

Nick,
Does FRAM 0 work OK?  Can you remove one of the FRAM chips and verify whether the other works by itself?  Does your circuit look like the one in the spec sheet where you have external 1.8K pull-up resistors on the clock and data lines?  It would be useful if you could post your circuit diagram.

Dave
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2006\11\16@080011 by George Herzogn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Are you having touble with getting an interface?

I have purchased SOIC-20 adapter boards and cut them in half with a small hacksaw.  Then I finish the sides with emery paper.  The result is two boards to adapt SOIC-8 to 0.1pin spacing.

This worked out nicely from me because the SOIC-8 devices are light sensors and I could not do the 'dead bug' trick.  In the 'dead bug' trick, you turn the Soic-8 upside-down and solder each lead to an empty 8 Pin DIP socket with some 30 guage wire wrap wire.

I am beginning to not fear surface mount.  I even was able to bridge a 0.1uf capacitor between Vss and Vdd on the halved adapter boards.

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2006\11\27@112409 by Johnson Rodn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Johnson Rod wrote:

here's my *.sch and *.pcb cropped into a *.jpg i'm using 2.2k pullups
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2006\11\28@065537 by Johnson Rodn/a

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In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Johnson Rod wrote:

woo woo,
i found the problem. it was hardware related.
i assembled another pcb with a hotplate reflow & solder paste and it works fine
tyvm guys!

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