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LM629: Is there any difference of control method and command when LM628N-6/NOPB is replace with LM629M-8/NOPB?

Kazuya Nakai59
Guru 21585 points
Part Number: LM629

Hello guys,

One of my customers is considering replacing LM628N-6/NOPB with LM629M-8/NOPB.
At this moment, they have the following question.
Could you please give me your reply?

Q.  Is there any difference of control method and command when LM628N-6/NOPB is replace with LM629M-8/NOPB?
      In other wards, do they need to change their host processor program for LM628N-6/NOPB control?

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    TI__Prodigy 251 points

    Hello Kazuya,

    We're currently looking into the solution for the question that you've asked and will be sure to get back to you within 24 hours!

    Regards,

    Jaya Hari

  • 0 in reply to Jaya Hari
    Guru 21585 points

    Hello Jaya,

    Thank you very much for your reply.
    I'm looking forward to receiving your team reply.

    Thank you again and best regards,
    Kazuya.

  • 0 in reply to Kazuya Nakai59
    TI__Prodigy 251 points

    Hello Kazuya,

    Based on information from the shared datasheet for LM628N-6/NOPB and LM629M-8/NOPB, it appears that the main difference between the two devices are their package (for LM628N-6 it's a 28-pin PDIP Package and for LM629M-8 it's a 24-pin SOIC Package) and pinout. Additionally, the internal clock for the LM629M-8 is quicker. LM628N-6 has DAC output (DAC0 to DAC7) while the LM629M-8 has a simpler PWM output (sign and magnitude signals). The LM628N-6 has an 8-bit output mode and 12-bit output mode and can convert to an analog signal (using a DAC to analog converter based on which output mode you are using). Figures in page 26 and 27 in the datasheet illustrates this.

    However, in terms of serial interface, both are the same; you can likely keep the same host control program since all of the registers seem to be shared between the two devices.

    Regards,

    Jaya Hari