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DS1307 Problem — Parallax Forums

DS1307 Problem

ArchiverArchiver Posts: 46,084
edited 2002-04-03 08:07 in General Discussion
I have a problem with the DS1307, I built the PCB for
the DS1307 with the PIC-N-LCD for LCD control so with
this card I have control of the LCD and the Real TIME
CLOCK. I get FF:FF:FF for time,, maybe is
interference or something wrong. I cut the tracks
that join the +5v from the circuit of the DS1307 and
the PIC-N-LCD and the DS1307 works perfect,, when I
use the same power supply I get wrong values or
garbage.... of someone know how to fix this,, I will
appreciate so much

Regards,
Alejadnro Vazquez

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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-03-17 19:51
    Hi Alejadnro,

    Are you using the battery backup function of the DS1307? I've found
    that if you don't need the battery backup, the VBatt pin must be
    grounded for it to work properly. I've been in the same boat as you:
    seeing FF:FF:FF flash on the screen! Try grounding the pin and see if
    it works.

    Good luck,
    --Jeff
    Add a RTC, up to 256k EEPROM and an I2C buss to your BS2
    www.high-techgarage.com/products/timekeeper3.php

    --- In basicstamps@y..., Alejandro Vazquez <alexvazquez@y...> wrote:
    > I have a problem with the DS1307, I built the PCB for
    > the DS1307 with the PIC-N-LCD for LCD control so with
    > this card I have control of the LCD and the Real TIME
    > CLOCK. I get FF:FF:FF for time,, maybe is
    > interference or something wrong. I cut the tracks
    > that join the +5v from the circuit of the DS1307 and
    > the PIC-N-LCD and the DS1307 works perfect,, when I
    > use the same power supply I get wrong values or
    > garbage.... of someone know how to fix this,, I will
    > appreciate so much
    >
    > Regards,
    > Alejadnro Vazquez
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Yahoo! Sports - live college hoops coverage
    > http://sports.yahoo.com/
  • ArchiverArchiver Posts: 46,084
    edited 2002-03-17 20:43
    i had the same problem and to fix it i just had to scrub the flux off the pc
    board.

    Lincoln
    Original Message
    From: "Alejandro Vazquez" <alexvazquez@y...>
    To: <basicstamps@yahoogroups.com>
    Sent: Saturday, March 16, 2002 7:39 PM
    Subject: [noparse][[/noparse]basicstamps] DS1307 Problem


    > I have a problem with the DS1307, I built the PCB for
    > the DS1307 with the PIC-N-LCD for LCD control so with
    > this card I have control of the LCD and the Real TIME
    > CLOCK. I get FF:FF:FF for time,, maybe is
    > interference or something wrong. I cut the tracks
    > that join the +5v from the circuit of the DS1307 and
    > the PIC-N-LCD and the DS1307 works perfect,, when I
    > use the same power supply I get wrong values or
    > garbage.... of someone know how to fix this,, I will
    > appreciate so much
    >
    > Regards,
    > Alejadnro Vazquez
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Yahoo! Sports - live college hoops coverage
    > http://sports.yahoo.com/
    >
    > 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.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
  • ArchiverArchiver Posts: 46,084
    edited 2002-04-02 20:38
    Hello,, I have a problem sharing the power supply
    between a DS1307 with other circuit (shift register).
    When I only use the power supply for the DS1307 i get
    a perfect reading but when I share the power supply I
    get a reading like this: FF:01:00 that increments 3 by
    3 (very strange). I already try to use separte 7805
    for each circuit but I get the same problem. If
    someone knows how to fix it please let me know.

    Thanks
    Alex

    __________________________________________________
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    Yahoo! Tax Center - online filing with TurboTax
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  • ArchiverArchiver Posts: 46,084
    edited 2002-04-03 08:07
    One thing is make sure your grounds are commom for both uses. This may help
    Eric
    Original Message
    From: "Alejandro Vazquez" <alexvazquez@y...>
    To: "Basic Stamp" <basicstamps@yahoogroups.com>
    Sent: Tuesday, April 02, 2002 2:38 PM
    Subject: [noparse][[/noparse]basicstamps] DS1307 problem


    > Hello,, I have a problem sharing the power supply
    > between a DS1307 with other circuit (shift register).
    > When I only use the power supply for the DS1307 i get
    > a perfect reading but when I share the power supply I
    > get a reading like this: FF:01:00 that increments 3 by
    > 3 (very strange). I already try to use separte 7805
    > for each circuit but I get the same problem. If
    > someone knows how to fix it please let me know.
    >
    > Thanks
    > Alex
    >
    > __________________________________________________
    > Do You Yahoo!?
    > Yahoo! Tax Center - online filing with TurboTax
    > http://http://taxes.yahoo.com/
    >
    > 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.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
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