use pic10f222 internal absolute voltage refrence
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I want to use PIC10f222 ADC and have no prolem in it :
#include <10F222.h>
#list
#device PIC10F222
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOMCPU //Master Clear Pull-up disabled
#FUSES NOMCLR
#FUSES IOSC4 //INTOSC speed 4 MHz
#device adc=8
#use delay(internal=4000000)
#define set_options(value)#ASM
MOVLW value
OPTION
#ENDASM
setup_adc(true);
set_tris_b (0b111); //set as output
set_options(0xDF); // Enable pin B2 for normal i/o
set_adc_channel(0);
adc1=read_adc();
But, when when VDD changes the ADC shows different values (and that is also OK because the reference voltage is VDD).
I looked in PIC10F222 data sheet and found "absolute voltage refrence" that equals :
result = 0.6 * 256 / VDD
I thougth I can get VDD from the equation above and then get the precise adc value as follow:
adc_set_channel(2);
adc1=read_adc();
vdd=0.6 * 256 / adc1 ;
adc_set_channel(0);
adc=read_adc();
//get the percise adc in popotion of VDD
....
But the adc1 (absolute voltage reference is not going to chane with different VDD from 4.9 to 5.2),
How can I fix this problem?
microcontroller pic
edited Nov 12 at 12:10
Mike
1,5411421
asked Nov 9 at 16:43
Majid.r
3718
add a comment |
up vote
0
down vote
favorite
I want to use PIC10f222 ADC and have no prolem in it :
#include <10F222.h>
#list
#device PIC10F222
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOMCPU //Master Clear Pull-up disabled
#FUSES NOMCLR
#FUSES IOSC4 //INTOSC speed 4 MHz
#device adc=8
#use delay(internal=4000000)
#define set_options(value)#ASM
MOVLW value
OPTION
#ENDASM
setup_adc(true);
set_tris_b (0b111); //set as output
set_options(0xDF); // Enable pin B2 for normal i/o
set_adc_channel(0);
adc1=read_adc();
But, when when VDD changes the ADC shows different values (and that is also OK because the reference voltage is VDD).
I looked in PIC10F222 data sheet and found "absolute voltage refrence" that equals :
result = 0.6 * 256 / VDD
I thougth I can get VDD from the equation above and then get the precise adc value as follow:
adc_set_channel(2);
adc1=read_adc();
vdd=0.6 * 256 / adc1 ;
adc_set_channel(0);
adc=read_adc();
//get the percise adc in popotion of VDD
....
But the adc1 (absolute voltage reference is not going to chane with different VDD from 4.9 to 5.2),
How can I fix this problem?
microcontroller pic
edited Nov 12 at 12:10
Mike
1,5411421
asked Nov 9 at 16:43
Majid.r
3718
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem?
– Oleg Mazurov
Nov 9 at 17:20
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem? Are you observing adc1 not changing while changing VDD? Or are you stating this? The latter is incorrect. In C, 'vdd=0.6 * 256 / adc1' will always result in zero, perhaps, that's why you see the behaviour you're describing.
– Oleg Mazurov
Nov 9 at 17:31
1
Your question, as asked, cannot be answered. Over the 4.9 to 5.2 VDD voltage range the ADC result will change about 1 or 2 counts. I do not see a solution in firmware for the PIC10F222.
– Dan1138
Nov 10 at 0:57
Why are you working with float values?
– Mike
2 days ago
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I want to use PIC10f222 ADC and have no prolem in it :
#include <10F222.h>
#list
#device PIC10F222
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOMCPU //Master Clear Pull-up disabled
#FUSES NOMCLR
#FUSES IOSC4 //INTOSC speed 4 MHz
#device adc=8
#use delay(internal=4000000)
#define set_options(value)#ASM
MOVLW value
OPTION
#ENDASM
setup_adc(true);
set_tris_b (0b111); //set as output
set_options(0xDF); // Enable pin B2 for normal i/o
set_adc_channel(0);
adc1=read_adc();
But, when when VDD changes the ADC shows different values (and that is also OK because the reference voltage is VDD).
I looked in PIC10F222 data sheet and found "absolute voltage refrence" that equals :
result = 0.6 * 256 / VDD
I thougth I can get VDD from the equation above and then get the precise adc value as follow:
adc_set_channel(2);
adc1=read_adc();
vdd=0.6 * 256 / adc1 ;
adc_set_channel(0);
adc=read_adc();
//get the percise adc in popotion of VDD
....
But the adc1 (absolute voltage reference is not going to chane with different VDD from 4.9 to 5.2),
How can I fix this problem?
microcontroller pic
edited Nov 12 at 12:10
Mike
1,5411421
asked Nov 9 at 16:43
Majid.r
3718
I want to use PIC10f222 ADC and have no prolem in it :
#include <10F222.h>
#list
#device PIC10F222
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOMCPU //Master Clear Pull-up disabled
#FUSES NOMCLR
#FUSES IOSC4 //INTOSC speed 4 MHz
#device adc=8
#use delay(internal=4000000)
#define set_options(value)#ASM
MOVLW value
OPTION
#ENDASM
setup_adc(true);
set_tris_b (0b111); //set as output
set_options(0xDF); // Enable pin B2 for normal i/o
set_adc_channel(0);
adc1=read_adc();
But, when when VDD changes the ADC shows different values (and that is also OK because the reference voltage is VDD).
I looked in PIC10F222 data sheet and found "absolute voltage refrence" that equals :
result = 0.6 * 256 / VDD
I thougth I can get VDD from the equation above and then get the precise adc value as follow:
adc_set_channel(2);
adc1=read_adc();
vdd=0.6 * 256 / adc1 ;
adc_set_channel(0);
adc=read_adc();
//get the percise adc in popotion of VDD
....
But the adc1 (absolute voltage reference is not going to chane with different VDD from 4.9 to 5.2),
How can I fix this problem?
microcontroller pic
microcontroller pic
edited Nov 12 at 12:10
Mike
1,5411421
asked Nov 9 at 16:43
Majid.r
3718
edited Nov 12 at 12:10
Mike
1,5411421
asked Nov 9 at 16:43
Majid.r
3718
edited Nov 12 at 12:10
Mike
1,5411421
edited Nov 12 at 12:10
Mike
1,5411421
edited Nov 12 at 12:10
Mike
1,5411421
1,5411421
asked Nov 9 at 16:43
Majid.r
3718
asked Nov 9 at 16:43
Majid.r
3718
asked Nov 9 at 16:43
Majid.r
3718
3718
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem?
– Oleg Mazurov
Nov 9 at 17:20
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem? Are you observing adc1 not changing while changing VDD? Or are you stating this? The latter is incorrect. In C, 'vdd=0.6 * 256 / adc1' will always result in zero, perhaps, that's why you see the behaviour you're describing.
– Oleg Mazurov
Nov 9 at 17:31
1
Your question, as asked, cannot be answered. Over the 4.9 to 5.2 VDD voltage range the ADC result will change about 1 or 2 counts. I do not see a solution in firmware for the PIC10F222.
– Dan1138
Nov 10 at 0:57
Why are you working with float values?
– Mike
2 days ago
add a comment |
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem?
– Oleg Mazurov
Nov 9 at 17:20
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem? Are you observing adc1 not changing while changing VDD? Or are you stating this? The latter is incorrect. In C, 'vdd=0.6 * 256 / adc1' will always result in zero, perhaps, that's why you see the behaviour you're describing.
– Oleg Mazurov
Nov 9 at 17:31
1
Your question, as asked, cannot be answered. Over the 4.9 to 5.2 VDD voltage range the ADC result will change about 1 or 2 counts. I do not see a solution in firmware for the PIC10F222.
– Dan1138
Nov 10 at 0:57
Why are you working with float values?
– Mike
2 days ago
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem?
– Oleg Mazurov
Nov 9 at 17:20
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem?
– Oleg Mazurov
Nov 9 at 17:20
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem? Are you observing adc1 not changing while changing VDD? Or are you stating this? The latter is incorrect. In C, 'vdd=0.6 * 256 / adc1' will always result in zero, perhaps, that's why you see the behaviour you're describing.
– Oleg Mazurov
Nov 9 at 17:31
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem? Are you observing adc1 not changing while changing VDD? Or are you stating this? The latter is incorrect. In C, 'vdd=0.6 * 256 / adc1' will always result in zero, perhaps, that's why you see the behaviour you're describing.
– Oleg Mazurov
Nov 9 at 17:31
1
1
Your question, as asked, cannot be answered. Over the 4.9 to 5.2 VDD voltage range the ADC result will change about 1 or 2 counts. I do not see a solution in firmware for the PIC10F222.
– Dan1138
Nov 10 at 0:57
Your question, as asked, cannot be answered. Over the 4.9 to 5.2 VDD voltage range the ADC result will change about 1 or 2 counts. I do not see a solution in firmware for the PIC10F222.
– Dan1138
Nov 10 at 0:57
Why are you working with float values?
– Mike
2 days ago
Why are you working with float values?
– Mike
2 days ago
add a comment |
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> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem?
– Oleg Mazurov
Nov 9 at 17:20
> But the adc1 (absolute voltage refrence is not going to chane with different VDD from 4.9 to 5.2), How can i fix this prroblem? Are you observing adc1 not changing while changing VDD? Or are you stating this? The latter is incorrect. In C, 'vdd=0.6 * 256 / adc1' will always result in zero, perhaps, that's why you see the behaviour you're describing.
– Oleg Mazurov
Nov 9 at 17:31
1
Your question, as asked, cannot be answered. Over the 4.9 to 5.2 VDD voltage range the ADC result will change about 1 or 2 counts. I do not see a solution in firmware for the PIC10F222.
– Dan1138
Nov 10 at 0:57
Why are you working with float values?
– Mike
2 days ago