Question about RTC
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Hiya fellow stampers
I am looking for a RTC preferably Dallas series, doesn't have to be, that
has a I2C buss, time-date function, EEPROM, and most important alarm
interrupt outputs. really need 2 outputs. I found plenty out there but none
had an alarm interrupt output pin.
I need this so the BS2 could avoid polling the RTC and continue doing other
things until interrupted.
any ideas appreciated
Daryl
I am looking for a RTC preferably Dallas series, doesn't have to be, that
has a I2C buss, time-date function, EEPROM, and most important alarm
interrupt outputs. really need 2 outputs. I found plenty out there but none
had an alarm interrupt output pin.
I need this so the BS2 could avoid polling the RTC and continue doing other
things until interrupted.
any ideas appreciated
Daryl
Comments
output ,http://www.parallax.com/detail.asp?product_id=27962
Stan
--- In basicstamps@yahoogroups.com, Daryl Berryhill <djberry@h...>
wrote:
> Hiya fellow stampers
>
> I am looking for a RTC preferably Dallas series, doesn't have to
be, that
> has a I2C buss, time-date function, EEPROM, and most important
alarm
> interrupt outputs. really need 2 outputs. I found plenty out there
but none
> had an alarm interrupt output pin.
>
> I need this so the BS2 could avoid polling the RTC and continue
doing other
> things until interrupted.
>
> any ideas appreciated
> Daryl
This is a I2C rtc with builtin eeprom and supervisory circuitry (watchdog,
power-on-reset),
backup battery input, 2 alarm registers: the chip tests for 2 individual
date/time
alarms and sets a bit in the status register if matched. This status
register must be polled
but you don't need to compare alarm settings against current time.
regards peter
Original Message
From: "Daryl Berryhill" <djberry@h...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, June 08, 2004 4:46 AM
Subject: [noparse][[/noparse]basicstamps] Question about RTC
> Hiya fellow stampers
>
> I am looking for a RTC preferably Dallas series, doesn't have to be, that
> has a I2C buss, time-date function, EEPROM, and most important alarm
> interrupt outputs. really need 2 outputs. I found plenty out there but
none
> had an alarm interrupt output pin.
>
> I need this so the BS2 could avoid polling the RTC and continue doing
other
> things until interrupted.
>
> any ideas appreciated
> Daryl
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
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Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
sense of the term. If I understand you, though,
you just want the BS2 to 'poll' a single "alarm pin",
instead of having to read the current time again
and again and again.
If so, then the other posts have the solution
for you.
--- In basicstamps@yahoogroups.com, Daryl Berryhill <djberry@h...>
wrote:
> Hiya fellow stampers
>
> I am looking for a RTC preferably Dallas series, doesn't have to
be, that
> has a I2C buss, time-date function, EEPROM, and most important
alarm
> interrupt outputs. really need 2 outputs. I found plenty out there
but none
> had an alarm interrupt output pin.
>
> I need this so the BS2 could avoid polling the RTC and continue
doing other
> things until interrupted.
>
> any ideas appreciated
> Daryl
pins need to be external. They will be connected to an I/O pin. when the
time matches the alarm time it changes state the BS2 will know to read the
register. also rather have a DIP than smt type.
At 10:42 PM 6/7/2004, you wrote:
>Check out the Xicor X1227 (http://www.xicor.com)
>This is a I2C rtc with builtin eeprom and supervisory circuitry (watchdog,
>power-on-reset),
>backup battery input, 2 alarm registers: the chip tests for 2 individual
>date/time
>alarms and sets a bit in the status register if matched. This status
>register must be polled
>but you don't need to compare alarm settings against current time.
>
>regards peter
>
>
Original Message
>From: "Daryl Berryhill" <djberry@h...>
>To: <basicstamps@yahoogroups.com>
>Sent: Tuesday, June 08, 2004 4:46 AM
>Subject: [noparse][[/noparse]basicstamps] Question about RTC
>
>
> > Hiya fellow stampers
> >
> > I am looking for a RTC preferably Dallas series, doesn't have to be, that
> > has a I2C buss, time-date function, EEPROM, and most important alarm
> > interrupt outputs. really need 2 outputs. I found plenty out there but
>none
> > had an alarm interrupt output pin.
> >
> > I need this so the BS2 could avoid polling the RTC and continue doing
>other
> > things until interrupted.
> >
> > any ideas appreciated
> > Daryl
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
>
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>Yahoo! Groups Links
>
>
>
>
use a digital alarm clock with dual outputs (relays) that you
plug directly into the AC power wall socket.
These clocks are not to expensive and have usually a small
lcd display and advanced relay trigger functions.
regards peter
Original Message
From: "Daryl Berryhill" <djberry@h...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, June 09, 2004 5:32 AM
Subject: Re: [noparse][[/noparse]basicstamps] Question about RTC
> the X1227 sounds like a perfect match. with one slight problem. the alarm
> pins need to be external. They will be connected to an I/O pin. when the
> time matches the alarm time it changes state the BS2 will know to read the
> register. also rather have a DIP than smt type.
>
>
>
> At 10:42 PM 6/7/2004, you wrote:
> >Check out the Xicor X1227 (http://www.xicor.com)
> >This is a I2C rtc with builtin eeprom and supervisory circuitry
(watchdog,
> >power-on-reset),
> >backup battery input, 2 alarm registers: the chip tests for 2 individual
> >date/time
> >alarms and sets a bit in the status register if matched. This status
> >register must be polled
> >but you don't need to compare alarm settings against current time.
> >
> >regards peter
> >
> >
Original Message
> >From: "Daryl Berryhill" <djberry@h...>
> >To: <basicstamps@yahoogroups.com>
> >Sent: Tuesday, June 08, 2004 4:46 AM
> >Subject: [noparse][[/noparse]basicstamps] Question about RTC
> >
> >
> > > Hiya fellow stampers
> > >
> > > I am looking for a RTC preferably Dallas series, doesn't have to be,
that
> > > has a I2C buss, time-date function, EEPROM, and most important alarm
> > > interrupt outputs. really need 2 outputs. I found plenty out there but
> >none
> > > had an alarm interrupt output pin.
> > >
> > > I need this so the BS2 could avoid polling the RTC and continue doing
> >other
> > > things until interrupted.
> > >
> > > any ideas appreciated
> > > Daryl
> > >
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in the Subject
and
> >Body of the message will be ignored.
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> >
> >To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> >from the same email address that you subscribed. Text in the Subject and
> >Body of the message will be ignored.
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>
wrote:
> Hiya fellow stampers
>
> I am looking for a RTC preferably Dallas series, doesn't have to
be, that
> has a I2C buss, time-date function, EEPROM, and most important
alarm
> interrupt outputs. really need 2 outputs. I found plenty out there
but none
> had an alarm interrupt output pin.
>
> I need this so the BS2 could avoid polling the RTC and continue
doing other
> things until interrupted.
>
> any ideas appreciated
> Daryl
Hi Daryl,
it sounds like you want a programmable alarm and not just a clock
chip.
The BS2 is the thing that would look at the clock and then decide
when to do something.
A second micro (BS1 ?) could watch the clock and then create the
alarm output, but that is adding a lot of complication to a simple
circuit.
Dave
The Philips PCF8593 is a very nice I2C RTC in an 8-pin DIP that has
alarm registers and an interrupt pin. The interrupt pin is highly
useful and programmable for one-time date/time alarm, weekday alarms
or for a low frequency timer output. The PCF8583 is the same except
that it also includes 240 bytes of general purpose RAM.
I am not sure if Parallax has one of those available for sale. It
does not come up in search.
-- Tracy
>--- In basicstamps@yahoogroups.com, Daryl Berryhill <djberry@h...>
>wrote:
>> Hiya fellow stampers
>>
>> I am looking for a RTC preferably Dallas series, doesn't have to
>be, that
>> has a I2C buss, time-date function, EEPROM, and most important
>alarm
>> interrupt outputs. really need 2 outputs. I found plenty out there
>but none
>> had an alarm interrupt output pin.
>>
>> I need this so the BS2 could avoid polling the RTC and continue
>doing other
>> things until interrupted.
>>
>> any ideas appreciated
> > Daryl
>
thanks for the info. this is Exactly what I was looking for. The extra ram
is nice to. all I needed was 32 bytes. Unfortunately Digikey or mouser
doesn't stock it. I was able to find it at www.arrow.com for
2.78. Learned something I didn't know. This IC comes in the SOT-97-1
package. which is the same thing as a DIP8 only smaller.
Someone said, I think it was Dave, to use a BS1 as a secondary controller.
excellent idea. guess I could use it as my main controller. since I'm using
(2) PCF8574 I/O expanders and PCF8583 RTC/alarm/ram. with some custom I2C
routines, the BS1 should fit the bill.
The project I'm working on is just a simple 8 channel On/Off timer for
outside lighting with inputs for 8 motion sensors. using 8 fused SSR's to
handle the load. (because they were free) certain lights will come on for a
length of time or when triggered by motion.
oh yeah, Samsung mobile phone wall-wart charger makes a nice 5V power
source. When I opened the case was surprised to find a small SMPS giving
out 5V @ 1A. That was the best $1 spent at a thrift store. Yicks!! guess
I'm getting a little O/T .. oh well..
Daryl
At 11:09 AM 6/9/2004, you wrote:
>Hi Daryl,
>
>The Philips PCF8593 is a very nice I2C RTC in an 8-pin DIP that has
>alarm registers and an interrupt pin. The interrupt pin is highly
>useful and programmable for one-time date/time alarm, weekday alarms
>or for a low frequency timer output. The PCF8583 is the same except
>that it also includes 240 bytes of general purpose RAM.
>
>I am not sure if Parallax has one of those available for sale. It
>does not come up in search.
>
> -- Tracy
>
>
>
> >--- In basicstamps@yahoogroups.com, Daryl Berryhill <djberry@h...>
> >wrote:
> >> Hiya fellow stampers
> >>
> >> I am looking for a RTC preferably Dallas series, doesn't have to
> >be, that
> >> has a I2C buss, time-date function, EEPROM, and most important
> >alarm
> >> interrupt outputs. really need 2 outputs. I found plenty out there
> >but none
> >> had an alarm interrupt output pin.
> >>
> >> I need this so the BS2 could avoid polling the RTC and continue
> >doing other
> >> things until interrupted.
> >>
> >> any ideas appreciated
> > > Daryl
> >
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>Yahoo! Groups Links
>
>
>
>