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  1. Replies
    3
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    62

    Closed: Re: Measure inl of an ADC in cadence

    Hi,

    This topic is not new, thus do an internet search "INL measurement ADC" to find documents.

    I see documents from adc manufacturers, but I assume cadence gives related informations, too.
    ...
  2. Closed: Re: 7 segment LED with integrated zener diode .

    Hi,

    I see no reason, why the zener can't be external.

    I don't think EM (HF) is a problem, I rather think it's overvoltage, overcurrent or overheat.
    But LEDs are rather robust, but they don't...
  3. Closed: Re: Phase detector with synchronous logic (FPGA)

    Hi,

    DFT or correlation comes into my mind.
    Not that difficult math..but good precision, even for noisy signals.

    Klaus
  4. Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,


    Why do you ask?
    Page 159 specifies supply voltage range....and it starts at 3V.

    But if you want lower supply voltage, then just choose another logic family. Like 74HC4060. It starts at...
  5. Replies
    4
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    150

    Closed: Re: 72 pin SIMM pinout and circuit

    Hi,

    A fully agree with FvM.
    The first results of a simple internet search "simm sdram specification" leads you the big manufacturers... and reliable informations.

    Klaus
  6. Closed: Re: how to boost microvolts to higher voltages?

    Hi.

    Why don't you draw the dual supply?
    ... when you want to discuss about...

    Klaus
  7. Replies
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    150

    Closed: Re: 72 pin SIMM pinout and circuit

    Hi,

    If you are the designer, the you should give specifications.
    Otherwise we could guess a hundred posts....

    Klaus
  8. Closed: Re: how to boost microvolts to higher voltages?

    Hi,


    There is no answer, because there is a lack of information.

    * what do you define as 0V_node?
    * where is +IN connected.

    --> draw a clear and complete schematic, where we can see "0V"...
  9. Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,

    In post#10 you have chosen Atmega48.
    --> Thus in post#11 I referred exactly to Atmega48 datasheet.
    Now you choose another AVR ... and another clock frequency.... why?
    Please stay focussed....
  10. Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,


    I recommended
    * 32kHz --> 25uA @ 3V active
    * most of the time idle --> 15uA @ 3V

    For sure, if you don't follow my recommendation, then you get different values. No wonder...

    Klaus
  11. Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,

    Not clear how you come to 12uA...

    There are low power microcontrollers. Like AVR picopower, maybe other brands draw even less power.
    When running on a 32kHz clock XTAL ... and pushing them...
  12. Closed: Re: how to boost microvolts to higher voltages?

    Hi,


    Just to clarify:
    When you violate absolute maximum ratings, then immediately permanent damage may occur.

    When you want to look for informations, where the Opamp will work correctly you...
  13. Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,

    20uA for a CMOS devuce is pretty high.
    But it's not the typical current, but the maximum current.

    Nexperia 74LVC163 datasheet says 0.1uA typ. quiescent current.
    But every signal...
  14. Closed: Re: Glow LED on specified counter values 0-500 in 89c52 uC

    Hi,



    Is the same as
    if ( (Counter % 15) == 10) LED1 = 1;

    Klaus
  15. Replies
    2
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    156

    [PIC]Closed: Re: PIC Program for Multilevel Inverter

    Hi,

    A question....
    * Do you want to write code on your own? --> then start with an idea, a piece of paper, a pencil, a flow chart....
    * Or do you want someone else write code for you? --> then...
  16. Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,

    Definitions of "Precision" and "duty cycle" can be found in the internet.

    A "signal" should be defined somehow...
    (I assume it's a digital signal) ... low level, high level, ON time, OFF...
  17. Closed: Re: Glow LED on specified counter values 0-500 in 89c52 uC

    Hi,


    (Counter - 10) % 10) is the same as (Counter % 10)
    (Counter - 15) % 15) is the same as (Counter % 15)

    Klaus
  18. Closed: Re: Ultra low-power timer to make a power saving circuit

    Hi,

    Give specifications, like
    * expected current consumption ... but please not "as low as possible"
    * precision,
    * duty cyle, or how the signal should look like
    * supply voltage
    ... and so...
  19. Closed: Re: Basic 12v Battery VOLTAGE METER, more resolution needed

    Hi,


    And this I think exactly is the point "why".

    If the voltage drop (and power dissipation) is not done externally, then all the (same) power dissipation needs to be done in the LM3914. It...
  20. Closed: Re: how to boost microvolts to higher voltages?

    Hi,

    I agree.


    Then I'm unusual, too ;-)

    Studying the function, doing maths, deciding specifications, reading, reading again, doing (hand drawn) flow charts, finding suitable parts....
    All...
  21. Closed: Re: Glow LED on specified counter values 0-500 in 89c52 uC

    Hi,

    As "counter" is used both in main and isr, it should be declared "volatile".

    If "counter" needs multiple access to be processed (i.e. 16 bit variable on a 8 bit microcontroller) you should...
  22. Closed: Re: Basic 12v Battery VOLTAGE METER, more resolution needed

    Hi,

    And sometimes it's useful to take a photo from the component's side, then mirror it on the PC and print it out.
    This way you see the components from "bottom view"..

    Klaus
  23. Closed: Re: Glow LED on specified counter values 0-500 in 89c52 uC

    Hi,

    In the given code I miss how the LEDs are set to "0".

    Klaus
  24. Closed: Re: Basic 12v Battery VOLTAGE METER, more resolution needed

    Hi,


    Thanks.
    Yes, I meant R7.
    Sorry for that. I correct it in the original post to avoid further confusion.

    And as Brad says:
    5W rated resistors may go up to more than 150°C with full...
  25. Closed: Re: Basic 12v Battery VOLTAGE METER, more resolution needed

    Hi,


    R7 is already marked "2W". You must not ignore this information.
    (EDIT: originally I wrongly wrote "C7")

    Did you install a suitable resistor?

    Klaus
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