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TPL0202-10: Power Sequence

stefano Panzera
Prodigy 30 points

Part Number: TPL0202-10

Tool/software:

Using several digital potentiometer in a circuit, connected each one to the proper component network may result difficult to respect the power sequence in 9.1.

Is there any minimum current that may be applied to the terminal without enter the diodes in forward biasing?

Just for example, if the TPL0202 is used in a circuit like the one in figure, is there any minimal current which can set in order to avoid the power sequence? 

Or VDD (TPL0202) must anyway gets stable before Vi and Vcc?

9.1 Power Sequence

Protection diodes limit the voltage compliance at terminal H, terminal L, and terminal W, making it important to
power up VDD first before applying any voltage to terminal H, terminal L, and terminal W. The diodes are forward biasing,
meaning VDD can be powered unintentionally if VDD is not powered first. The ideal power-up sequence is
VDD, digital inputs, and VH, VL, and VW. The order of powering digital inputs, VH, VL, and VW does not matter as
long as they are powered after VDD.

  • 0
    TI__Mastermind 42253 points

    Hi Stefano, 

    We do not have this characterized, but in my experience even small currents will risk conducting the ESD diodes. This will likely not damage the device long term but could cause an improper power on. Is it possible to power cycle all potentiometers in the circuit once the supplies are established to make sure they power on correctly? 

    Best,

    Katlynne Jones