pic microcontroller

[rakhiwilliams]

hi all,

we are searching for a pic controller, we want to do project on this.

our project requirements are ,
1.atleast one differential ADC input.
2.it should generate PWM of frequency 100kHz by using internal oscillator only.without using any external oscillators.
3.it should have minimum number of pins(between 14 and 18)

please try to help us.
thanks to all....

 

[Pommie]

I don't know what you mean by differential ADC.

The 16F88 has 18 pins, 7 ADC inputs, an internal 8MHz clock and can generate a PWM signal at 80kHz or 200kHz if you use an external 20MHz crystal.

Mike.

 

[rakhiwilliams]

hi,
we want differential voltage input ADC,(additional feature of ADC)not single ended.

 

[Pommie]

Why can't you use two inputs and subtract them in software?

Mike.

 

[Nigel Goodwin]

hi,
we want differential voltage input ADC,(additional feature of ADC)not single ended.

Just add an external opamp if you need differntial inputs, or like Pommie said, do it in software - I don't think there's any PIC with differential inputs?, it's really a useless feature on a micro-controller.

Like Pommie also says, the 16F88 sounds ideal for your purposes.

 

[ericgibbs]

Just add an external opamp if you need differntial inputs, or like Pommie said, do it in software - I don't think there's any PIC with differential inputs?, it's really a useless feature on a micro-controller.

Like Pommie also says, the 16F88 sounds ideal for your purposes.

A low cost diff inst opa is the Analog Devices AD623.