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Thread: Multiple MCP4922, but the last is clipping the value.

  1. #1

    Multiple MCP4922, but the last is clipping the value.

    Hi i have 4 SPI DACs MCP4922 running on a Teensy 3.2. The first three are working fine (Output is till 5V) but the last one is clipping the output at around 4.2V. I measured the vdd and vref on the last mcp and they are fine, like the others. As vref and vdd i am using the vin(5v) from the Teensy.
    Any ideas what this could be?

  2. #2
    I solved it after researching and testing today.
    I found on the page from Paul (https://www.pjrc.com/author/paul/page/3/) to add a pull up resistor of 10k to cs. This did the trick now the last one isn't clipping any more.

  3. #3
    Senior Member PaulStoffregen's Avatar
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    Nov 2012
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    21,282
    Glad that old SPI article helped.

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