There are many voltage monitoring chips, including the battery monitors
(The DS2438 and DS276X DS277X and DS278X).
The DS2438 is used in many designs because it is cheap, easy to work with
and can be powered by the battery it is monitoring. (It also measures
current and temperature). It's range is 0-10V so you'll need a voltage
divider (measure between two large resistors).
There are also excellent 3rd party devices like EDS's new EDS008X series
with 4 or 8 voltage measurments and the ability to trigger alarms and trip
relays. The 1wire bus master is used for recording and setting the
parameters, but the monitoring is done by the device's microcontroller.
Finally, if you are measuring a computer's voltage, many CPUs generate that
data themselves (just look at the BIOS page for "System Health") -- though
the CPU voltages are usually in the sub 3V range.
On Sun, Feb 24, 2013 at 6:24 AM, Attila <[email protected]> wrote:
> I tried DS2450 - and decided NEVER use it again.
> It is a very low quality AD converter. Read values are jumping very much,
> and I could not fix it by oversampling. Even using 100x oversampling the
> read voltage was jumping a lot.
> Comparing to MCP3008 SLI interface AD converter it is a crap. (MCP3008 is
> also "jumping " +-1 value, but with 10x times oversampling it can be fixed
> quite well - while DS2450 was not able to reach it even with 100x
> oversampling)
>
> Datasheet tells that DS2450 is ONLY a 8 bit AD, 2 least significant bits
> arejust a "guess" - take this into consideration as well.
>
> As I know there are other chips (battery monitor, I can't recall its name)
> what can be used for AD conversion on 1wire bus - but I never tried these
>
> Attila
>
>
> On Sun, Feb 24, 2013 at 3:37 AM, Peter Hollenbeck <[email protected]>wrote:
>
>> I wish to sense the voltage in a nominal 12 volt system. I have seen the
>> DS2450 recommended and I also see a MS-TV Voltage Sensor from
>> iButtonLink.com.
>>
>> I would appreciate comments and suggestions on a good way to do this job.
>>
>> Is a 1Wire master always required? I have a Hobby Boards serial master
>> and it works fine but the voltage sensor will be on a different computer.
>>
>> Thank you,
>> Peter Hollenbeck
>> Electronics Ignoramus.
>>
>>
>>
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>
>
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