PIC16F1503 ADC refrence

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Hi Friends

My Processor is PIC16F1503,
it Has Analog-to-Digital Converter
Fixed Voltage Reference(1.024V,2.048V and 4.096V output levels)
Digital-to-Analog Converter (DAC),

My question is that, is it possible output of Fixed Voltage Reference or Digital-to-Analog Converter
use the Analog-to-Digital Converters Reference level ?




Latheef
 

Might be possible. Try setting the DAC output to the required ADC Vref and tie DAC output directly to Vref+ pin. Vref- pin if present should be connected to GND.
 

thanks for your replay.
OK but I have to use all I/O pinss
 

What do you mean by using all I/O pins ?
 

YES
" the DAC output to the required ADC Vref and tie DAC output directly to Vref+ pin." THIS TYPE LOSE 2 I/O PINS
 

Hi,

My question is that, is it possible output of Fixed Voltage Reference
Click to expand...
The answer is:yes.

But you don't want to use an IO pin? ...if I understood correctely...
How do you think it is possible to output any signal from a microcontroller without using a pin?
Wireless? --> I assume this is impossible for an anlog reference voltage signal.
--> You need to use a pin.

Klaus
 

hello,

i didn't study your 16F1503 datasheet
but on any PIC as 18F26K22 , the Fixed reference can be used for ADC via VFR buffer
so, response must be inside datashet

18F26K22 :

17.1.3 ADC VOLTAGE REFERENCE
The PVCFG<1:0> and NVCFG<1:0> bits of the
ADCON1 register provide independent control of the
positive and negative voltage references.
The positive voltage reference can be:
• VDD
• the fixed voltage reference (FVR BUF2)
• an external voltage source (VREF+)
The negative voltage reference can be:
• VSS
• an external voltage source (VREF-)
 

Thanks Mr: paulfjujo .
At last I understood
The Fixed Voltage Reference is not use for PIC16F1503.

the Datasheet says:
15.1.3 ADC VOLTAGE REFERENCE
The ADPREF bits of the ADCON1 register provides
control of the positive voltage reference. The positive
voltage reference can be:
• VREF+ pin
• VDD
See Section 13.0 “Fixed Voltage Reference (FVR)”
for more details on the Fixed Voltage Reference.


But The Fixed Voltage Reference is only a ADC Channel, not able for ADC Reference


Thanks
Latheef
 

FVRCON is properly configured provided Ref Voltage internally to the ADC module without the need to use a Analog output pin, I guess. I will check the datasheet.
 

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