Texas Instruments TPS3899EVM, Руководство пользователя, Страница: 11 / 17

4.5 Programmable Push-Button Functionality Using Jumper J5
Figure 4-3 shows a programmable push-button circuit that has a programmable holding condition and a
programmable output width. The TPS3899EVM supports testing for programmable push-button functionality.
This is accomplished using a shunt on jumper J5 (RESET [pin 4] to R
DIV
[pin 3]). This shunt shorts RESET to R3
which then connects to SENSE and simulates the push-button. Please note this functionality is designed for the
push-pull active high variant (TPS3899PHXX) which does not come default installed on the EVM.
This configuration allows the user to create a programmable push-button such that it has to be held for the
sense time delay set by the CTS capacitor for the reset to become active. After the reset becomes asserted, the
push-button no longer affects the reset output and reset will remain asserted for the reset time delay set by the
CTR capacitor. This configuration is useful if needing to hold a device on/off for a certain duration of time after a
specified push-button press has occurred. See
Figure 4-4 for a detailed timing diagram.
TPS3899PHxx
VDD
GND
RESET
CTS CTR
SENSE
Push-button
input
Vin
Copyright © 2020, Texas Instruments Incorporated
Figure 4-3. Programmable Push-Button Circuit
RESET
t
D-SENSE
V
IT-
+ V
HYS
V
IT-
PB
SENSE
t
D
Figure 4-4. Programmable Push-Button Timing Diagram
www.ti.com EVM Setup and Operation
SLVUBZ3 – SEPTEMBER 2020
Submit Document Feedback
TPS3899EVM Voltage Supervisor User Guide 11
Copyright © 2020 Texas Instruments Incorporated