TPL0102 datasheet(34/48 Pages) TI2

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TPL0102

SLIS134C – MARCH 2011 – REVISED SEPTEMBER 2015

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9 Power Supply Recommendations

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

VSS, VDD, VLOGIC, 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 VSS, VDD, and VLOGIC.

9.2 Wiper Position Upon Power Up

It is prudent to know that when the DPOT is powered off, the impedance of the device is not known. Upon power

up, the device will go to 0x80h code for a very short period of time while it loads the stored wiper position in the

EEPROM and then will go to the stored position. This happens in less than 100 uS.

9.3 Dual-Supply vs Single-Supply

Dual-supply operation allows the TPL0102 to handle voltage that may swing negative. This is especially useful

for any application that involves negative voltages, such as the input to an Op Amp or audio signals. It is

recommended that VSS (negative supply) is mirrored with VDD (positive supply) and both are centered around

GND. For example, if dual-supply is desired and VDD = 2.50 V, then VSS should be equal to -2.50 V, which will

result in GND centered between VDD and VSS.

Single-supply operation allows the TPL0102 to handle positive voltages only. In single-supply, it is recommended

that VSS is tied to GND.

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