SV: [basicstamps] Low Voltage Stamps?
Archiver
Posts: 46,084
Greetings!
Tracy Allen wrote:
> The BS1 is based on a PIC16C56, which does not have a brownout
> detector built in. That chip is supposed to operate down to 3.0
> volts at 4mhz. I see no reason you could not make yourself an OEM
> BS1 to run at 3.0 volts. It would really get to micro power at that
> level. That was always a great feature of the BS1--low power
> operation.
The OEM version have a big flaw in my case; it's TOO BIG...
Is it possible to modify the ordinary BS1?
(It arrived yesterday. Now, if only the rest of the parts could show up :-)
> I have made BS2 circuits that run on a stack of two coin cells in one
> holder (6 volts). The circuit had a pushbutton to activate, then at
> the end of the action, the BS2 turned off its own power supply for
> zero-power standby.
The problem is that I need drain up to 50mA from the cells, and most coin
cells are rated at less than 20mA...
:-)
Trygve
Tracy Allen wrote:
> The BS1 is based on a PIC16C56, which does not have a brownout
> detector built in. That chip is supposed to operate down to 3.0
> volts at 4mhz. I see no reason you could not make yourself an OEM
> BS1 to run at 3.0 volts. It would really get to micro power at that
> level. That was always a great feature of the BS1--low power
> operation.
The OEM version have a big flaw in my case; it's TOO BIG...
Is it possible to modify the ordinary BS1?
(It arrived yesterday. Now, if only the rest of the parts could show up :-)
> I have made BS2 circuits that run on a stack of two coin cells in one
> holder (6 volts). The circuit had a pushbutton to activate, then at
> the end of the action, the BS2 turned off its own power supply for
> zero-power standby.
The problem is that I need drain up to 50mA from the cells, and most coin
cells are rated at less than 20mA...
:-)
Trygve
Comments
> > BS1 to run at 3.0 volts.
>
>The OEM version have a big flaw in my case; it's TOO BIG...
>Is it possible to modify the ordinary BS1?
>(It arrived yesterday. Now, if only the rest of the parts could show up :-)
I didn't mean the OEM module, rather, the BS1 interpreter chip. You
would have to add your own circuit board and the other required
parts. It could be pretty small in surface mount. With a 3 volt
lithium cell, you might not need a voltage regulator, but watch out
for the programming pins from the PC at 5 volts.
I don't see any easy way to modify the surface mount BS1-IC module
for operation at 3 volts. At the very least you would have to hack
out the voltage regulator and the reset chip.
-- Tracy