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Original question:

LM3914: Please tell me how to respond after discontinuing production.

LM3914: Let me discuss it with customer request.

Pokkun
Genius 4695 points
Part Number: LM3914
Other Parts Discussed in Thread: LP3944, LP3943

Hi, team.

I have inquired below.

e2e.ti.com/.../734417

I understood that there are no devices that can be configured without changing surrounding signals.

I think not good.

Therefore, customers are considering to form discrete circuit.

＜Consider＞

· Don't change ambient signals.

· Customer is trying to make a discreet disc.

· Change of base pattern is possible.

I will introduce TI's device as below.

Isn't there a clearly problematic device select?

Also, is there another good device?

Please advice me.

  • 0
    TI__Mastermind 22745 points
    Hi Pokkun,
    We don't have the device that can replace LM3914 directly, if you can provide the detail specs form your customer. Maybe we can help to choose the suitable device for you.
    Sean
  • 0
    TI__Genius 14295 points
    Hi, Pokkun,

    As you can see from original post, LP3944/LP3943 is recommend for alternative parts.

    We also have other multi-channel led drivers which may be more suitable.

    So do you have any specific requirements for the LED driver? From my side, forming a discrete circuit takes more effort than switching to a new driver.

    Let me know your thought.

    Thanks.
    Regards,
    Kenneth
  • 0 in reply to Kenneth Du
    Genius 4695 points
    Thanks for your comment, Kenneth-san.

    Can LP3943/3944 satisfy the request below?

    <Customer Request>
    Customer would like to drive it without communication with MCU.
    In addition, other detailed specifications are below.
    · Voltage of "LEDV +" = 5 V
    · Voltage of "RHB" = 9V
    · Voltage of "SIG IN" = 0 to 10 V @ Analog Sine Wave

    These conditions can not be changed.


    Best regards,
    Pokkun
  • 0 in reply to Pokkun
    TI__Genius 14295 points
    Hi, Pokkun,

    As you can see from the datasheet, these two devices are using I2C control, so it needs MCU commands.

    Thanks.
    Regards,
    Kenneth
  • 0 in reply to Kenneth Du
    Genius 4695 points
    Hi, Kenneth-san.

    >As you can see from the datasheet, these two devices are using I2C control, so it needs MCU commands.

    I already know that.

    We will reorganize the situation again.

    · The customer controls the LM3914 with analog signals.
    → MCU does not control.
    ※ Customers can change the pattern, but can not change the control method.
    · We believe LP3943 / 3944 introduced as a substitute can not control with analog signal.
    → So I asked discrete to make a configuration like the LM 3914.


    Please answer the question of the first thread.

    Best regards,
    Pokkun