--- In m..., OneStone wrote: >
> iT'S BECOMING A BIG AND BULKY small system ;@}.
>
> Al
>
> Hardy Griech wrote:
> > On 09.03.2010 01:25, OneStone wrote:
> > :
> >> resistors) and what channels they can connect through for a result. Of > >> course designing a low power app with a divider
across the battery that > >> is in circuit all the time isn't a great
idea, since it will usually > >> draw current all the time. why li-ion and an LDO,
wasteful of energy if > > :
> >
> > inserting a FET in series with the resistors controlled by a port pin > > should help.
> >
> > Hardy
> >
> >
> >
> >
> >
> >
> >
Hardy Griech wrote: > On 09.03.2010 01:25, OneStone wrote:
> :
>> resistors) and what channels they can connect through for a result. Of
>> course designing a low power app with a divider across the battery that
>> is in circuit all the time isn't a great idea, since it will usually
>> draw current all the time. why li-ion and an LDO, wasteful of energy if
> :
>
> inserting a FET in series with the resistors controlled by a port pin
> should help.
>
> Hardy
>
Reply by Hardy Griech●March 9, 20102010-03-09
On 09.03.2010 01:25, OneStone wrote:
: > resistors) and what channels they can connect through
for a result. Of
> course designing a low power app with a divider across the battery that
> is in circuit all the time isn't a great idea, since it will usually
> draw current all the time. why li-ion and an LDO, wasteful of energy if :
inserting a FET in series with the resistors controlled by a port pin
should help.
Hardy
Reply by OneStone●March 8, 20102010-03-08
The result is the same, if they check out the diagram on page 24-3 it
will show them how Ti does it (not exactly difficult, a pair of
resistors) and what channels they can connect through for a result. Of
course designing a low power app with a divider across the battery that
is in circuit all the time isn't a great idea, since it will usually
draw current all the time. why li-ion and an LDO, wasteful of energy if
this is a low power long battery life application.
Al
Hardy Griech wrote: > On 08.03.2010 16:36, OneStone wrote:
> :
>> I don't have the OP yet, but it's even easier than that. One of
the
>> available A/D channels is Vcc/2. It's intended for exactly this
purpose.
> :
>
> The OP wrote something about battery voltage, not Vcc of the MSP430.
> Could be different voltages.
>
> Hardy
>
Reply by Hardy Griech●March 8, 20102010-03-08
On 08.03.2010 16:36, OneStone wrote:
: > I don't have the OP yet, but it's even
easier than that. One of the
> available A/D channels is Vcc/2. It's intended for exactly this
purpose. :
The OP wrote something about battery voltage, not Vcc of the MSP430.
Could be different voltages.
Hardy
Reply by "e.tury"●March 8, 20102010-03-08
This only works if the battery feeds the device directly. In my app I use a
Li-Ion and a 3 volt LDO regulator. Since I want the battery voltage I need to
bring it in on a separate channel.
--- In m..., OneStone wrote: >
> I don't have the OP yet, but it's even easier than that. One of the
> available A/D channels is Vcc/2. It's intended for exactly this purpose.
> Channel 11 on the ADC10. The 2013 also does this on channel 5 of the
> SD16. The diagram on 24-3 of the user guide shows this (my version may
> be old, it's in the SD16 section anyway and easy to find.
>
> Al
>
> Barbara wrote:
> > Well, I cannot help on ADC12, neither on MSP430F5435, for I have never
worked with either of them. But I can give you some hints on how to measure your
battery's voltage. (I have done this last week with a MSP430F2013).
> >
> > First, I assume you know how to use your ADC properly. Then, I assume you
know the maximum voltage your ADC can read.
> > Knowing this, I guess the easiest way to do so is to create a relation
between the real voltage (VBatt) and the read voltage (the one your ADC will get
and read).
> >
> > So, at first, you'll have to have a voltage divider between your
battery and your ADC. In my case, I had a 3.5V battery and the maximum voltage
to my ADC had to be 0.6V. I did it with 2 resistors. It's that simple.
> >
> > After this, you'll do the following: you'll measure different
values from your original voltage (VBatt) and from the ADC. ALSO, measure the
approximate values your ADC reads from each of these voltages.
> > Set it to an excel chart, for example, and trace a graph, where the
horizontal axis is the approximated value from your ADC and the vertical axis
shows the real voltage you expect.
> > For example: in my case, 3.5V = 65535. so, I put 65535 on the horizontal
axis and 3.5 on the vertical axis and so on.
> > When you have it set, you can calculate a tendency line, and ask excel to
show its equation to you. You'll have something like
> > y = 6E-05x - 0.3435
> > Where Y will be VBatt (what you're searching for) and X will be the
read ADC value (which you have from your measurements).
> > When you have it done, just test it and set any small adjustments you need
to do.
> >
> > Good luck.
> >
> >
> >
> >
> > ________________________________
> > De: nlri12002
> > Para: m...
> > Enviadas: Segunda-feira, 8 de Março de 2010 11:57:00
> > Assunto: [msp430] How to measure battery voltage by ADC?
> >
> >
> > I want to use ADC12 to measurment battery voltage on MSP430 F5435.
> > But I don't know how to getting started. Could anyone give me some
suggestions or example code? Thanks!
> >
> >
> >
> >
> >
> >
____________________________________________________________________________________
> > Veja quais são os assuntos do momento no Yahoo! +Buscados
> > http://br.maisbuscados.yahoo.com
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
Reply by Barbara●March 8, 20102010-03-08
sure
________________________________
De: e.tury
Para: m...
Enviadas: Segunda-feira, 8 de Março de 2010 13:54:48
Assunto: Re: Res: [msp430] How to measure battery voltage by ADC?
Thanks for the heads up. Learn something new every day.
--- In msp430@yahoogroups. com, OneStone wrote: >
> I don't have the OP yet, but it's even easier than that. One of the
> available A/D channels is Vcc/2. It's intended for exactly this purpose.
> Channel 11 on the ADC10. The 2013 also does this on channel 5 of the
> SD16. The diagram on 24-3 of the user guide shows this (my version may
> be old, it's in the SD16 section anyway and easy to find.
>
> Al
>
> Barbara wrote:
> > Well, I cannot help on ADC12, neither on MSP430F5435, for I have never
worked with either of them. But I can give you some hints on how to measure your
battery's voltage. (I have done this last week with a MSP430F2013) .
> >
> > First, I assume you know how to use your ADC properly. Then, I assume you
know the maximum voltage your ADC can read.
> > Knowing this, I guess the easiest way to do so is to create a relation
between the real voltage (VBatt) and the read voltage (the one your ADC will get
and read).
> >
> > So, at first, you'll have to have a voltage divider between your
battery and your ADC. In my case, I had a 3.5V battery and the maximum voltage
to my ADC had to be 0.6V. I did it with 2 resistors. It's that simple.
> >
> > After this, you'll do the following: you'll measure different
values from your original voltage (VBatt) and from the ADC. ALSO, measure the
approximate values your ADC reads from each of these voltages.
> > Set it to an excel chart, for example, and trace a graph, where the
horizontal axis is the approximated value from your ADC and the vertical axis
shows the real voltage you expect.
> > For example: in my case, 3.5V = 65535. so, I put 65535 on the horizontal
axis and 3.5 on the vertical axis and so on.
> > When you have it set, you can calculate a tendency line, and ask excel to
show its equation to you. You'll have something like
> > y = 6E-05x - 0.3435
> > Where Y will be VBatt (what you're searching for) and X will be the
read ADC value (which you have from your measurements) .
> > When you have it done, just test it and set any small adjustments you need
to do.
> >
> > Good luck.
> >
> >
> >
> >
> > ____________ _________ _________ __
> > De: nlri12002
> > Para: msp430@yahoogroups. com
> > Enviadas: Segunda-feira, 8 de Março de 2010 11:57:00
> > Assunto: [msp430] How to measure battery voltage by ADC?
> >
> >
> > I want to use ADC12 to measurment battery voltage on MSP430 F5435.
> > But I don't know how to getting started. Could anyone give me some
suggestions or example code? Thanks!
> >
> >
> >
> >
> >
> > ____________ _________ _________ _________ _________ _________ _
> > Veja quais são os assuntos do momento no Yahoo! +Buscados
> > http://br.maisbusca dos.yahoo. com
> >
> >
> >
> >
> >
> > ------------ --------- --------- ------
> >
> >
> >
> >
Reply by "e.tury"●March 8, 20102010-03-08
Thanks for the heads up. Learn something new every day.
--- In m..., OneStone wrote: >
> I don't have the OP yet, but it's even easier than that. One of the
> available A/D channels is Vcc/2. It's intended for exactly this purpose.
> Channel 11 on the ADC10. The 2013 also does this on channel 5 of the
> SD16. The diagram on 24-3 of the user guide shows this (my version may
> be old, it's in the SD16 section anyway and easy to find.
>
> Al
>
> Barbara wrote:
> > Well, I cannot help on ADC12, neither on MSP430F5435, for I have never
worked with either of them. But I can give you some hints on how to measure your
battery's voltage. (I have done this last week with a MSP430F2013).
> >
> > First, I assume you know how to use your ADC properly. Then, I assume you
know the maximum voltage your ADC can read.
> > Knowing this, I guess the easiest way to do so is to create a relation
between the real voltage (VBatt) and the read voltage (the one your ADC will get
and read).
> >
> > So, at first, you'll have to have a voltage divider between your
battery and your ADC. In my case, I had a 3.5V battery and the maximum voltage
to my ADC had to be 0.6V. I did it with 2 resistors. It's that simple.
> >
> > After this, you'll do the following: you'll measure different
values from your original voltage (VBatt) and from the ADC. ALSO, measure the
approximate values your ADC reads from each of these voltages.
> > Set it to an excel chart, for example, and trace a graph, where the
horizontal axis is the approximated value from your ADC and the vertical axis
shows the real voltage you expect.
> > For example: in my case, 3.5V = 65535. so, I put 65535 on the horizontal
axis and 3.5 on the vertical axis and so on.
> > When you have it set, you can calculate a tendency line, and ask excel to
show its equation to you. You'll have something like
> > y = 6E-05x - 0.3435
> > Where Y will be VBatt (what you're searching for) and X will be the
read ADC value (which you have from your measurements).
> > When you have it done, just test it and set any small adjustments you need
to do.
> >
> > Good luck.
> >
> >
> >
> >
> > ________________________________
> > De: nlri12002
> > Para: m...
> > Enviadas: Segunda-feira, 8 de Março de 2010 11:57:00
> > Assunto: [msp430] How to measure battery voltage by ADC?
> >
> >
> > I want to use ADC12 to measurment battery voltage on MSP430 F5435.
> > But I don't know how to getting started. Could anyone give me some
suggestions or example code? Thanks!
> >
> >
> >
> >
> >
> >
____________________________________________________________________________________
> > Veja quais são os assuntos do momento no Yahoo! +Buscados
> > http://br.maisbuscados.yahoo.com
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
Reply by OneStone●March 8, 20102010-03-08
I don't have the OP yet, but it's even easier than that. One of the
available A/D channels is Vcc/2. It's intended for exactly this purpose.
Channel 11 on the ADC10. The 2013 also does this on channel 5 of the
SD16. The diagram on 24-3 of the user guide shows this (my version may
be old, it's in the SD16 section anyway and easy to find.
Al
Barbara wrote: > Well, I cannot help on ADC12, neither on MSP430F5435,
for I have never worked with either of them. But I can give you some hints on
how to measure your battery's voltage. (I have done this last week with a
MSP430F2013).
>
> First, I assume you know how to use your ADC properly. Then, I assume you know
the maximum voltage your ADC can read.
> Knowing this, I guess the easiest way to do so is to create a relation between
the real voltage (VBatt) and the read voltage (the one your ADC will get and
read).
>
> So, at first, you'll have to have a voltage divider between your battery
and your ADC. In my case, I had a 3.5V battery and the maximum voltage to my ADC
had to be 0.6V. I did it with 2 resistors. It's that simple.
>
> After this, you'll do the following: you'll measure different values
from your original voltage (VBatt) and from the ADC. ALSO, measure the
approximate values your ADC reads from each of these voltages.
> Set it to an excel chart, for example, and trace a graph, where the horizontal
axis is the approximated value from your ADC and the vertical axis shows the
real voltage you expect.
> For example: in my case, 3.5V = 65535. so, I put 65535 on the horizontal axis
and 3.5 on the vertical axis and so on.
> When you have it set, you can calculate a tendency line, and ask excel to show
its equation to you. You'll have something like
> y = 6E-05x - 0.3435
> Where Y will be VBatt (what you're searching for) and X will be the read
ADC value (which you have from your measurements).
> When you have it done, just test it and set any small adjustments you need to
do.
>
> Good luck.
> ________________________________
> De: nlri12002
> Para: m...
> Enviadas: Segunda-feira, 8 de Março de 2010 11:57:00
> Assunto: [msp430] How to measure battery voltage by ADC?
>
>
> I want to use ADC12 to measurment battery voltage on MSP430 F5435.
> But I don't know how to getting started. Could anyone give me some
suggestions or example code? Thanks!
>
>
____________________________________________________________________________________
> Veja quais são os assuntos do momento no Yahoo! +Buscados
> http://br.maisbuscados.yahoo.com
>
>
>
>
Reply by Barbara●March 8, 20102010-03-08
what and how do you mean??
________________________________
De: e.tury
Para: m...
Enviadas: Segunda-feira, 8 de Março de 2010 12:55:09
Assunto: Re: Res: [msp430] How to measure battery voltage by ADC?
Why not just do the math on the fly?
--- In msp430@yahoogroups. com, Barbara wrote: >
> Well, I cannot help on ADC12, neither on MSP430F5435, for I have never worked
with either of them. But I can give you some hints on how to measure your
battery's voltage. (I have done this last week with a MSP430F2013) .
>
> First, I assume you know how to use your ADC properly. Then, I assume you know
the maximum voltage your ADC can read.
> Knowing this, I guess the easiest way to do so is to create a relation between
the real voltage (VBatt) and the read voltage (the one your ADC will get and
read).
>
> So, at first, you'll have to have a voltage divider between your battery
and your ADC. In my case, I had a 3.5V battery and the maximum voltage to my ADC
had to be 0.6V. I did it with 2 resistors. It's that simple.
>
> After this, you'll do the following: you'll measure different values
from your original voltage (VBatt) and from the ADC. ALSO, measure the
approximate values your ADC reads from each of these voltages.
> Set it to an excel chart, for example, and trace a graph, where the horizontal
axis is the approximated value from your ADC and the vertical axis shows the
real voltage you expect.
> For example: in my case, 3.5V = 65535. so, I put 65535 on the horizontal axis
and 3.5 on the vertical axis and so on.
> When you have it set, you can calculate a tendency line, and ask excel to show
its equation to you. You'll have something like
> y = 6E-05x - 0.3435
> Where Y will be VBatt (what you're searching for) and X will be the read
ADC value (which you have from your measurements) .
> When you have it done, just test it and set any small adjustments you need to
do.
>
> Good luck.
>
>
>
>
> ____________ _________ _________ __
> De: nlri12002
> Para: msp430@yahoogroups. com
> Enviadas: Segunda-feira, 8 de Março de 2010 11:57:00
> Assunto: [msp430] How to measure battery voltage by ADC?
>
>
> I want to use ADC12 to measurment battery voltage on MSP430 F5435.
> But I don't know how to getting started. Could anyone give me some
suggestions or example code? Thanks!
>
>
>
>
>
> ____________ _________ _________ _________ _________ _________ _
> Veja quais são os assuntos do momento no Yahoo! +Buscados
> http://br.maisbusca dos.yahoo. com
>
>
>
____________________________________________________________________________________
Veja quais são os assuntos do momento no Yahoo! +Buscados http://br.maisbuscados.yahoo.com
