telephone current

[John Fields]

On 14 Aug 2004 16:32:36 GMT, "Homer.Simpson"
<Homer.Simpson@SpringfieldBB.com.INVALID> wrote:

Anthony Fremont said
That's close to what I get as well (off hook of course). On hook
gives me close to 50V and I can draw roughly 3mA from it without the
CO cutting me off, or missing any incoming calls. ;-) I've run a PIC
chip and an LCD powered solely by the phone line for days on end
without any ill effects. YMMV

This is peaking my interest for no particular reason. What would one do
with such a processor and display connected to the phone line?

---
Why your interest is peaking is piquing mine, but Caller ID, for one
thing, is a good candidate. Especially since you can get a nice hit
during the first ring which you can use to run things during the CID
interval.

--
John Fields

 

[Jonathan Kirwan]

On Sat, 14 Aug 2004 13:59:26 -0500, John Fields <jfields@austininstruments.com>
wrote:

Why your interest is peaking is piquing mine, but Caller ID, for one
thing, is a good candidate. Especially since you can get a nice hit
during the first ring which you can use to run things during the CID
interval.

I think I see an MSP-430 in your future!

Jon

 

[Homer.Simpson]

John Fields said

On 14 Aug 2004 16:32:36 GMT, "Homer.Simpson"
Homer.Simpson@SpringfieldBB.com.INVALID> wrote:

Anthony Fremont said
That's close to what I get as well (off hook of course). On hook
gives me close to 50V and I can draw roughly 3mA from it without the
CO cutting me off, or missing any incoming calls. ;-) I've run a PIC
chip and an LCD powered solely by the phone line for days on end
without any ill effects. YMMV

This is peaking my interest for no particular reason. What would one do
with such a processor and display connected to the phone line?

---
Why your interest is peaking is piquing mine, but Caller ID, for one
thing, is a good candidate. Especially since you can get a nice hit
during the first ring which you can use to run things during the CID
interval.

hehe,

I quick pique at a dictionary tells me you're making fun of me. ;-)

Caller ID seems like an interesting idea. Is this data sent in some serial
fashion? Might be a neat project.

--
All reports are in; life is now officially unfair.

 

[John Fields]

On Sat, 14 Aug 2004 20:02:52 GMT, Jonathan Kirwan
<jkirwan@easystreet.com> wrote:

On Sat, 14 Aug 2004 13:59:26 -0500, John Fields <jfields@austininstruments.com
wrote:

Why your interest is peaking is piquing mine, but Caller ID, for one
thing, is a good candidate. Especially since you can get a nice hit
during the first ring which you can use to run things during the CID
interval.

I think I see an MSP-430 in your future!

---
Hmmm... I've been playing with Motorola's ľC's for so long I almost
forgot there was anybody else out there. Thanks for waking me up!

--
John Fields

 

[Rich Grise]

Homer.Simpson wrote:

John Fields said
On 14 Aug 2004 16:32:36 GMT, "Homer.Simpson"
This is peaking my interest for no particular reason. What would one do
with such a processor and display connected to the phone line?

---
Why your interest is peaking is piquing mine, but Caller ID, for one
thing, is a good candidate. Especially since you can get a nice hit
during the first ring which you can use to run things during the CID
interval.

hehe,

I quick pique at a dictionary tells me you're making fun of me. ;-)

Caller ID seems like an interesting idea. Is this data sent in some
serial
fashion? Might be a neat project.

Now, now. Don't PIC on him too much.

 

[John Fields]

On 14 Aug 2004 21:45:18 GMT, "Homer.Simpson"
<Homer.Simpson@SpringfieldBB.com.INVALID> wrote:

John Fields said

On 14 Aug 2004 16:32:36 GMT, "Homer.Simpson"
Homer.Simpson@SpringfieldBB.com.INVALID> wrote:

Anthony Fremont said
That's close to what I get as well (off hook of course). On hook
gives me close to 50V and I can draw roughly 3mA from it without the
CO cutting me off, or missing any incoming calls. ;-) I've run a PIC
chip and an LCD powered solely by the phone line for days on end
without any ill effects. YMMV

This is peaking my interest for no particular reason. What would one do
with such a processor and display connected to the phone line?

---
Why your interest is peaking is piquing mine, but Caller ID, for one
thing, is a good candidate. Especially since you can get a nice hit
during the first ring which you can use to run things during the CID
interval.


hehe,

I quick pique at a dictionary tells me you're making fun of me. ;-)

Caller ID seems like an interesting idea. Is this data sent in some serial
fashion?

Uh-huh.

http://www.ee.washington.edu/circuit_archive/text/callerid/spec.html

Might be a neat project.

Uh-huh.

--
John Fields

 

[Jonathan Kirwan]

On Sat, 14 Aug 2004 16:54:29 -0500, John Fields <jfields@austininstruments.com>
wrote:

Hmmm... I've been playing with Motorola's ľC's for so long I almost
forgot there was anybody else out there. Thanks for waking me up!

When you realize that these things burn only 2.3uA (measured with a 32kHz low
freq clock operating) or so in mode 3 and that the real time clock is still
operating and all interrupts are active at this time...

And when you realize that this CPU can wake up, guaranteed, in less than 6us and
be running at 8MHz then (typical is 2us)...

then you realize that the fancy micro-power PICs just won't cut the mustard for
really LOW LOW power operation.

These babies will almost run on the power derived from antenna affects of short
PCB traces and can get up to full speed in so quick that by the time you get
your task finished it's 14us *before* you started out!

Well,... almost.

They are nice if you count every nanoJoule like it was gold.

Jon