It is possible to use the TPL1401 as an 8bit programmable comparator. To do this, write the desired comparator threshold value to the DPOT_POS bits in the DPOT_POSITION register. Find the correct code using the transfer function below:
(Register table taken from TPL1401 datasheet version * Sept 2020)
Apply the input signal to the FB pin of the TPL1401 and the internal buffer will act as a comparator. If VIN > VTHRESH the output will be low, and if VIN < VTHRESH the output will be high.
With the nonvolatile memory on the TPL1401, the comparator threshold value can be saved. To save the value in the NVM view: [FAQ] How to generate a DC setpoint or bias using the TPL1401? This allows the comparator to be used without a processor after the device is initially programmed, even when power cycled.
The TPL1401 can be found in many common applications:
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End equipment |
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Exit and emergency lighting |
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Barcode scanners |
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Barcode readers |
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Smart speakers |
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Video doorbells |
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Cordless vacuum cleaners |
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Robotic lawn mowers |
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Laser distance meter |
You can find some additional information about the TPL1401 here:
You can find more information about precision DACs here:
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Precision DAC Learning Center |
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TI Precision Labs - DACs |
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Data Converter Circuit Cookbook |
