I am working on Digital pot IC mcp4462 interfacing with pic16f886 via I2C ,
It's maximum range is 10K and I want to convert it into range from 15 ohm to 201 ohm How is it possible?

 

hi Swati,
Welcome to AAC,
Looking at the MCP4462 datasheet, I cannot see how it is possible to scale the chip to 15R to 210R.?
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hi Swati,
Welcome to AAC,
Looking at the MCP4462 datasheet, I cannot see how it is possible to scale the chip to 15R to 210R.?
E

Thank you ,
But What should i do?
Any other option to Resolve this Problem?

 

hi,
The best I can suggest at this time is to use the 5K section of the digipot in parallel with a 185R resistor and a series 15R.
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hi,
The best I can suggest at this time is to use the 5K section of the digipot in parallel with a 185R resistor and a series 15R.
E

Thank you ,
i will use this solution to solve above problem

 

hi,
I guess you know the combined resistance of the digipot and the 185R will not be a linear response, as the 5k digipot is stepped.?
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can you suggest me any other digital POT IC part number to resolve this problem ?
When we are connecting 4 wiper parallel to get output simultaneously.

 

You could consider connecting low value digipots in parallel.
Look at this selection.

 

hi,
The best I can suggest at this time is to use the 5K section of the digipot in parallel with a 185R resistor and a series 15R.
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1) Which part will come in 5k section of digital pot ?
2) May i consider two wiper (eg. wiper 0 and 1) as 5K section of digital pot IC.

 

hi,
Could you explain how you intend to use the digital pot.?
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hi,
Could you explain how you intend to use the digital pot.?
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I am using mcp 4462 digital pot interfacing with pic 16f886 via i2c , In Digital pot 4 wiper are connected parallel to get combined output (Resistance) where i required resistance 15 ohm to 201 ohm using this IC.

 

hi,
I have been searching suppliers but I cannot find a digitally set pot near to that low resistance value.
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hi,
I have been searching suppliers but I cannot find a digitally set pot near to that low resistance value.
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If you get any idea,Solution please reply me.

 

OK.
I understand the PIC is setting the digipot value, but how is the change in resistance used on the project.?
What is the pot connected too.?
Sometime it is possible to solve a problem using alternative methods.
E

 

OK.
I understand the PIC is setting the digipot value, but how is the change in resistance used on the project.?
What is the pot connected too.?
Sometime it is possible to solve a problem using alternative methods.
E

Any other 1k ohm,500 ohm, 200 ohm DIGITAL pot Ic available whose minimum resistance less than 75 ohm ??

Which is compatible with i2c?

 

hi sawti,
I have never seen a digipot with a value less than 1K.
The types I used were 5k and 10k.
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Any other 1k ohm,500 ohm, 200 ohm DIGITAL pot Ic available whose minimum resistance less than 75 ohm ??

Which is compatible with i2c?

1 kΩ digital pots are available, but I don't think I've ever seen any that have lower resistance. Microchip, Texas Instruments and Analog Devices all offer digital pots; follow those links and see what's available.

Generally speaking, if your circuit design depends on a component that does not exist, that's an indication that you need to consider a different design approach.