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Connecting multiple DAC7611/7612 devices.

tony poynter
Prodigy 20 points
Other Parts Discussed in Thread: DAC7611, DAC7612

I want to use a DAC7611 and a DAC7612 within a new design driven from a common bus. I have looked for applications information regarding connection of more than one DAC7611 to the same serial bus but have found nothing. Is it recommended to connect the two devices as follows:- CLK, SDI, /LD connected as a bus and a separate /CS line for each device (I'm not using /CLR, it will be tied to VCC) or would it be advisable to separate the /LD signals. I'm a little concerned about notes 2 & 3 of the DAC7611 data sheet and the lack of any information regarding connecting multiple devices to the same serial bus.

  • 0
    TI__Genius 10615 points

    Hi Tony,

     

    tony poynter said:
    I'm a little concerned about notes 2 & 3 of the DAC7611 data sheet and the lack of any information regarding connecting multiple devices to the same serial bus.

    Take a look at the Interface section in page 10 of the DAC7611 datasheet. (Included below for your convenience.)

    /CS enables or disables the shift register. As long as /CS is not asserted, the state of /LD should not affect the output of the DAC.

    tony poynter said:
    would it be advisable to separate the /LD signals

    This would really depend on your application. /LD signal LOW will update the output of the DAC with the current bits in the shift register.

    If all of your devices share the same /LD, a LOW in /LD will update all the devices at the same time. Many times this synchronous update across devices is desired by many applications.

    If your system requires update them independently, it can be accomplished by asserting /LD after each write.

     

    All of this info also applies to the DAC7612. If you have any other questions, please feel free to ask.

    Do you mind sharing the type of application that you will be using this devices in? TI is always interested in the ways that our customers are using our parts and it is very valuable to us to be able to get this information.

  • 0 in reply to Eugenio Mejia
    Prodigy 20 points

    Thanks for the assistance. The application is a multi-chemistry battery charger where the DAC7612 is used in the battery charger section and the DAC7611 is used as a programmable reference source to improve detection of battery charge termination.