TLV7031 datasheet(22/69 Pages) TI2

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7.2 Typical Applications

7.2.1 Window Comparator

Window comparators are commonly used to detect undervoltage and overvoltage conditions. Figure 7-3 shows a

simple window comparator circuit.

Micro-

Controller

UV_OV

3.3V

Sensor

RPU

Figure 7-3. TLV704x-Based Window Comparator

7.2.1.1 Design Requirements

For this design, follow these design requirements:

• Alert (logic low output) when an input signal is less than 1.1V

• Alert (logic low output) when an input signal is greater than 2.2V

• Alert signal is active low

• Operate from a 3.3V power supply

7.2.1.2 Detailed Design Procedure

Configure the circuit as shown in Figure 7-3. Connect VCC to a 3.3V power supply and VEE to ground. Make R1,

R2, and R3 each 10MΩ resistors. These three resistors are used to create the positive and negative thresholds

for the window comparator (VTH+ and VTH–). With each resistor being equal, VTH+ is 2.2V and VTH- is 1.1V. Large

resistor values such as 10MΩ are used to minimize power consumption. The sensor output voltage is applied to

the inverting and noninverting inputs of the two TLV704x devices. The TLV704x is used for the open-drain output

configuration. Using the TLV704x allows the two comparator outputs to be wire-ored together. The respective

comparator outputs are low when the sensor is less than 1.1V or greater than 2.2V. VOUT is high when the

sensor is in the range of 1.1V to 2.2V.

TLV7031, TLV7032, TLV7041, TLV7042, TLV7034, TLV7044

SLVSE13J – SEPTEMBER 2017 – REVISED NOVEMBER 2024

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TLV7031 Datasheet(PDF) 22 Page - Texas Instruments