SET Pin (2 Pins) Operation; WD_EN Pin Not Available

SET[1:0]

00 = WD multiplier = 1

01 = WD Disabled

10 = WD multiplier = n

11 = WD multiplier = m

WD time value

tWD

WD Disabled

tWD X m

tWD X n

SET Pin (2 Pins) Operation; WD_EN Available = 1

SET[1:0]

00 or 01 = WD multiplier = 1

10 = WD multiplier = n

11 = WD multiplier = m

WD time value

tWD

tWD X m

tWD X n

tWD = Fixed based on OPN or programmable using capacitor

n,m

= Fixed based on timeset multiplier chosen

Figure 8-10. Watchdog Operation with 2 SET Pins

SET0

0 = WD multiplier = 1

1 = WD multiplier = n

0 = WD multiplier = 1

1 = WD multiplier = n

WD time

value

tWD

tWD X n

tWD

tWD X n

tWD = Fixed based on OPN or programmable using capacitor

n = Fixed based on timeset multiplier chosen

Figure 8-11. Watchdog Operation with 1 SET Pin

8.3.2 Manual RESET

The TPS3435 supports manual reset functionality using MR pin. MR pin when driven with voltage lower than 0.3

x VDD, asserts the WDO output. The MR pin has 100 kΩ pull up to VDD. The MR pin can be left floating. The

internal pull up will ensure the output is not asserted due to MR pin trigger.

The output is deasserted after MR pin voltage rises above 0.7 x VDD voltage. Refer Figure 8-12 for more details.

MR

t

P-HL

0.3 x V

DD

tt

SDt

WDO

0.7 x V

DD

Figure 8-12. MR Pin Response

TPS3435

SNVSCF7 – DECEMBER 2022

www.ti.com

20

Submit Document Feedback

Copyright © 2022 Texas Instruments Incorporated

Product Folder Links: TPS3435