• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 17 subscribers
  • Views 247 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMUX582F-SEP: TMUX582F-SEP

Mark Phillips
Prodigy 50 points
Part Number: TMUX582F-SEP
Other Parts Discussed in Thread: SN74HCS238, SN74AHC238, TPS27SA08, TPS1HB08-Q1, TPS2HCS10-Q1, TPS1HA08-Q1

Tool/software:

The part I entered above is not the right one. I just put it there to get past the Required Field requirement so I could post this message.

I am looking for a part that will take 1 input (12-20V 10A DC) and direct that to one of 8 outputs (12-20V 10A DC) based on 3 logic level (+3.3V) inputs. Switching happens on the order of seconds. Does such a beast exist?

Thanks!

  • 0
    Guru 311850 points

    No; 1:8 muxes are intended for signals with much less than 10 A.

    Use a 3-to-8 demultiplexer with active-high outputs (e.g., SN74HCS238, SN74AHC238) for the control signals, and combine it with eight high-side switches (e.g., TPS27SA08).

  • 0 in reply to Clemens Ladisch
    TI__Mastermind 26870 points

    Thanks Clemens, I agree that is the best way to approach this.

    Hi Mark,

    TPS27SA08, TPS1HA08-Q1, TPS1HB08-Q1 can work for this. There's also TPS2HCS10-Q1 which has an SPI interface, but it can be controlled by logic via pulling the LHI and DI inputs high - this would turn on both channels. It sounds like a more excessive part than you need, but if you can make it work with having both outputs high at the same time, you can cut the number of devices needed from 8 to 4.

    Thanks,

    Patrick

  • 0 in reply to Patrick Shalton
    Prodigy 50 points

    Thanks Patrick and Clemens. These look like great solutions. I like the SPI interface and the data provided by the chips, but it is not available yet and TI is out of stock. Do you know when it will be available? Or another similar chip with a I2C interface to make controlling up to 64 channels easier?

    I have attached a part of my schematic to illustrate what I am trying to accomplish.

    I call this the "one-channel-solution". I can drive the current through the igniter or the lamp using the DAC Out signal and control signal to the relay. I now need to have multiple igniter channels (only need one lamp). I was hoping not to replicate the relay, op-amp, and MOSFET for each channel, (cost ~$5.00 per channel) hence my initial question.

    If you have any other suggestions on how to meet my objective at a lower cost, please let me know!

    Thanks!