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LM4970 Problem with simple testing

Leonhard Eberts
Prodigy 90 points

Other Parts Discussed in Thread: LM4970, LP3950

Hallo,[Problem:
Hallo, wir haben für unser Projekt einen Musterbaustein LM4970 bestellt. Die frage ist ob der Baustein im Auslieferungszustand im Refferenzboard vom Hersteller (siege Datasheet vom Hersteller PDF Seite 14) sofort funktionsfähig ist. Ich bennötige nur eine Bestätigung vom Hersteller ob die Bausteine im Auslieferungszustand und Montage auf dem Refferenzboard vom Hersteller (siehe Datasheet des Herstellers)im Audiosynchronisationsmodus sofort startfähig sind oder nicht? Bei der Überprüfung den vorangestellten Werten laut Datascheet ist alles so eingestellt das es funktionieren sollte, auser im MODE select Register " Enables device shutdown mode" voreingestellt ist. Bei mir sieht es so aus, als ob der Bausteein sofort nach dem Einschalten in Shutdown modus geht und nicht mehr funktioniert, obwohl am PIN 3 das Audiosignal anliegt das die Ausgänge ansteuern sollte.

Danke im Voraus Fa. Konsolenchips L. Eberts ]

  • 0
    TI__Guru**** 189401 points

    Hi, Leonhard,

    Sorry, I don't speak German. Can you repost in English?

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 90 points

    LM4970 does not work in audio synchronization mode.
    LM4970 must first be programmed to make it work with default values ​​in the audio sync mode? If yes how Is the program code and which programmer is one needed?

    Sorry for error (it was translated with google)
    Thank you.

  • 0 in reply to Leonhard Eberts
    TI__Guru**** 189401 points

    Hi, Leonard,

    Thanks. I was thinking of using google translate, but I figured you could do a better job.

    Anyway, tables 5-9 describe the default I2C register settings. For example, in Table 5, bit MSO, it says the default is shutdown. So, until you program it via I2C, you won't be able to do anything.

    For more info on I2C, see the Philips specification, or http://en.wikipedia.org/wiki/I%C2%B2C

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 90 points

    Hello,
    have the LM connected to I2C Programmer 4970. Command F4 S 04 P sent. The LM4970 responds only with NN.
    Port address is correct because ADR pin 10 is connected via 100 ohm to GND (ground).
    LM4970 does not respond and does not work.
    How do I get this to run LM4970?

  • 0 in reply to Leonhard Eberts
    Prodigy 90 points

    I want to buy from you the LM4970 Evaluation Package. How can I order it.
    Hopefully, theLM4970 kan with the Evaluation Package are programmed. With USB-I2C programmers it does not work to program LM4970.
    Thank you.

  • 0 in reply to Leonhard Eberts
    TI__Guru**** 189401 points

    Hi, Leonhard,

    I don't believe we have an eval kit for this.

    Are you sure your I2C programmer is working correctly?

    I don't understand what you mean by "NN".

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 90 points

    My USB-I2C programmer works with other IC. In my programmer SiLabs chip is installed.
    I use a terminal program downloaded here http://www.der-hammer.info/terminal/
    The answer N is notacknowledge, K response is acknowledge.
    Is it enough for programming only I2C Vdd Power +5 V on pin 7 and Groung on pins 4 and 12 it can be connected, or the LM4970 requires additional Vdd +5 V on pin 2.
    have the I2C Vdd and Vdd be interconnected or not see jumper J1 in page 13 Data Sheet?
      I2C programmer has 115200 baud speed, whether it is too slow or too fast for LM4970?
    Whether the instruction in hex ​​SF404P is right to disable the Shutdown mode or not?
    Sorry for mistakes (Google Translate)
    Thank you

  • 0 in reply to Leonhard Eberts
    Prodigy 90 points

    maybe the LM4970 is broken? The problem is this, man gets no sample chips from TI. The scenario is to test the LM4970 if the works and fits our project, I have 1000 chips LM4970 forced ordered from Texas Instrument. unfortunately that is not profitable.
    What other option is the LM4970 to our project to test so I do not have to buy the same 1000, but 1-2 pieces?
    Sorry for mistakes (Google Translate)
    Thank you

  • 0 in reply to Leonhard Eberts
    TI__Expert 3350 points

    Leonhard,

    The LM4970 needs power on both VDD and I2CVDD to function properly.  Make sure the I2CVDD is the same voltage that the I2C bus is being pulled up to, I2CVDD sets the I2C interface thresholds for the LM4970.  Check that your I2C programmer meets the I2C requirements as shown on page 4, note that the max clock rate is 400kHz.  Other than that, writing 0xF4 04 P should enable the LM4970 with the randomizer selected.  Then 0x F4 60 P to select audio sync mode.

    Regards,

    royce

  • 0 in reply to Royce Higashi
    Prodigy 90 points

    Hello,
    I2C Vdd and Vdd are both connected.
    Both have + 5 volts.
    I2C Vdd is same voltage that the I2C bus is being pulled up to.
    My I2C programmer has a clock rate of 250 Hz - 400 KHz. Is currently set to 100 KHz.
    LM4970 always responds with NotAcnowledge.
    Intended to enable the Autosync fashion both commands you mentioned are sent?
    Suggestion for an command S F4 60 P has yet to select pattern to doing
    According to Table 2 Mode Select Data Sheet should be sent 00000000 binary. This is 0x00 in hex?
    How do you get to the send command F4 S 60 P?
    Hex 60 = binary 1100000th How did you read out from Table 2 Data Sheet? But that belongs to Gain Select?

    Another question: Can ADR pin is connected directly to +5 volts or directly to GND to change address of the LM4970? Or via a 100 ohm resistor?
    Help LM4970 can not be programmed.

    Thanks in advance
    Leonhard

  • 0 in reply to Leonhard Eberts
    TI__Expert 3350 points

    Leonhard,

    I would strongly recommend conecting ADR to either VDD or GND directly.

    Regards,

    royce

  • 0 in reply to Royce Higashi
    Prodigy 90 points

    Hello, it finally works LM4970 with I2C commands.
    But will soon shut off power goes back into the LM4970 Standbay mode. Is it normal or should act commands permanent?
    If every time the chip is to be re-initialized via I2C then fit the LM4970 is not in our project.
    I have found another LP3950. This can be done by 1pin-Connect function in Default Mode with Audio Synchronization. It is not clear which are default values ​​used in the default mode. In Table 9, it is not apparent.
    Is it possible at the LP3950 permanently save commands even after power off?
    What values ​​AGC gain, SPEED, MODE_CTRL be used in audio sync default mode?
     Are there any other audio sync IC with 1 adjustable PIN Default Mode?
    LP3950 can be operated without BOST modules like? With +5 V or +12 V
    Where can I find FotPrint Library for EAGLE 6.0 or ORCAD of LP3950?

    Thank you (Sorry for Google translate)

  • 0 in reply to Leonhard Eberts
    TI__Expert 3350 points

    Leonhard,

    The LM4970 does not store the I2C register contents after power is removed from the device.  The device memory is cleared, and restored to default settings.  You need to reconfigure the LM4970 each time you power up.  

    As for the LP3950, please post you questions to the LED Drivers/LCD Bias forum.

    Regards,

    royce