TPS37 datasheet(18/48 Pages) TI

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8.3.2 SENSE

The TPS37 high voltage family integrates two voltage comparators, a precision reference voltage and trimmed

resistor divider. This configuration optimizes device accuracy because all resistor tolerances are accounted for

in the accuracy and performance specifications. Device also has built-in hysteresis that provides noise immunity

and ensures stable operation.

Channels are independent of each other, meaning that SENSE1 and SENSE2 and respective outputs can be

connected to different voltage rails.

Although not required in most cases, for noisy applications good analog design practice is to place a 10 nF to

100 nF bypass capacitor at the SENSEx inputs in order to reduce sensitivity to transient voltages on the

monitored signal. SENSE1 and SENSE2 pins can be connected directly to VDD pin.

8.3.2.1 SENSE Hysteresis

Built-in hysteresis to avoid erroneous output reset release. The hysteresis is opposite to the threshold voltage;

for overvoltage options the hysteresis is subtracted from the positive threshold (VITP), for undervoltage options

hysteresis is added to the negative threshold (VITN).

RESETx

SENSEx

VITP - VHYS VITP

Figure 8-4. Hysteresis (Overvoltage Active-Low)

RESETx

SENSEx

VITP - VHYS VITP

Figure 8-5. Hysteresis (Overvoltage Active-High)

RESETx

SENSEx

VITN

VITN+VHYS

Figure 8-6. Hysteresis (Undervoltage Active-High)

RESETx

SENSEx

VITN

VITN+VHYS

Figure 8-7. Hysteresis (Undervoltage Active-Low)

TPS37

SNVSBJ1D – OCTOBER 2020 – REVISED DECEMBER 2021

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TPS37 Datasheet(PDF) 18 Page - Texas Instruments