30 k

Ÿ

240 k

Ÿ

2.2 k

Ÿ

TL7700-SEP

CT

510 pF

RESET

SENSE

5 V

RESET

Microcontroller

GND

13

TL7700-SEP

www.ti.com

SLVSF13 – MARCH 2019

Product Folder Links: TL7700-SEP

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Copyright © 2019, Texas Instruments Incorporated

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TL7700-SEP supply-voltage supervisor allows for any voltage greater than 500 mV to be monitored. This

flexibility allows it to be used in many applications from FPGAs and microcontrollers to supply monitoring.

9.2 Typical Application

Figure 21 shows an application where the TL7700-SEP device is being used to sense the voltage supply for a

microcontroller that is supplied with 5 V. If the sense voltage drops below 4.5 V, the RESET pin is pulled LOW,

signaling the microcontroller to reset.

Figure 21. 5-V Supply Voltage Supervision

9.2.1 Design Requirements

•

•

The RESET output is an open-collector output, so a pullup resistor is required.

9.2.2 Detailed Design Procedure

sense voltage over 500 mV can be sensed.

Resistor R1 should be selected first to set the desired hysteresis. See the Sense-Voltage Hysteresis Setting

section for detailed information on how to set the hysteresis.