TLV7021 datasheet(13/18 Pages) TI1

13 / 18 page

VTH+ = 2.2V

VIN

VOUT

VTH-- = 1.1V

Time (usec)

100

150

200

TLV7011, TLV7021

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SLVSDM5 – MAY 2017

Product Folder Links: TLV7011 TLV7021

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Typical Application (continued)

8.2.1.1 Design Requirements

For this design, follow these design requirements:

•

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

•

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

•

Alert signal is active low

•

Operate from a 3.3-V power supply

8.2.1.2 Detailed Design Procedure

Configure the circuit as shown in Figure 12. Connect VCC to a 3.3-V power supply and VEE to ground. Make R1,

R2 and R3 each 10-MΩ 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 2.2 V and VTH- is 1.1 V. Large

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

the inverting and noninverting inputs of the two TLV7021's. The TLV7021 is used for its open-drain output

configuration. Using the TLV7021 allows the two comparator outputs to be Wire-Ored together. The respective

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

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

8.2.1.3 Application Curve

Figure 13. Window Comparator Results

TLV7021 Datasheet(PDF) 13 Page - Texas Instruments