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DRV5033: 670mV output high level inconsistent with supply (pullup) voltage

James Simonick
Prodigy 10 points
Part Number: DRV5033

Full part number is DRV5033AJQLPGM (purchased from Digi-Key).

Purchased 100 units. First 4 act the same with 100nF supply bypass and a 10k pullup; output pulls down normally (~67mV) but 'off' voltage only goes to ~670mV regardless of supply voltage.

Voltages tested ranged from 3-10VDC with output not pulling up as it should.

Why would the output be limited to about a diode-drop?

  • 0
    TI__Mastermind 20985 points
    Hi James, I would double-check the pin signals; make sure VCC/GND/OUT aren't swapped. The pins have ESD diodes, which might explain why you're seeing that strange voltage. Of course, when the DRV5033 output is high-impedance, the voltage on that node should simply pull up from your pullup resistor.

    Best regards,
    RE
  • 0 in reply to RE
    Prodigy 20 points
    I just tried out a couple of the DRV5033 sensors in TO-92 packages, double checked the pin-outs (page 20 of the data sheet, figure 26) and also get 0.6 volts (a diode drop) maximum from the output in the off state instead of the 10 volt Vcc. I have +10 on pin1, 10K from +10 to pin 2, pin 3 ground, and a 0.1uF from pins 1 to 3. (50 years of electronic development - happy to hear what I did wrong!)
  • 0 in reply to Tim Stanton
    TI__Mastermind 20985 points
    Hi Tim,

    For the DRV5033 in the TO-92 package,
    Pin 1 = VCC
    Pin 2 = GND
    Pin 3 = OUT

    You said 10V is on Pin 1, and it's connected through a 10k resistor to Pin 2 (GND), and your capacitor goes from VCC to OUT. Your Pins 2 and 3 appear to be swapped.

    If there's an error in the documentation, it wouldn't be the first time, and I'd love to know so I can fix it. However I don't see a problem. Page 4 describes the correct pinout, and the Figure 26 you mentioned is likewise correct with pin numbers.

    Best regards,
    RE
  • 0 in reply to RE
    Prodigy 20 points
    Thanks for the prompt reply - I clearly needed to read the spec sheet more carefully. I used the figure 18 application circuit for the pinouts, which was not a great idea.
    Regards Tim