TPS3435 Nano IQ Precision Timeout Watchdog Timer

1 Features

• Factory programmed or user-programmable

watchdog timeout

– ±10% Accurate timer (maximum)

– Factory programmed: 1ms to 100s

• Factory programmed or user-programmable reset

delay

– ±10% Accurate timer (maximum)

– Factory programmed option: 2ms to 10s

• Input voltage range: VDD = 1.04V to 6.0V

• Ultra low supply current: IDD = 250nA (typical)

• Open-drain, push-pull; active-low outputs

• Various programmability options:

– Watchdog enable-disable

– Watchdog startup delay: no delay to 10s

– On the fly timer extension: 1X to 256X

– Latched output option

• MR functionality support

2 Applications

• Robot servo drive

• Mixed module (AI, AO, DI, DO)

• HVAC controller

• Electricity meter

• Infusion pump

• Surgical equipment

3 Description

The TPS3435 is an ultra-low power consumption

(250nA typical) device offering a programmable

timeout watchdog timer.

The TPS3435 offers a high accuracy timeout

watchdog timer with a host of features for a wide

variety of applications. The timeout watchdog timer

can be factory programmed or user programmed

using an external capacitor. The timer value can be

changed on-the-fly using a combination of logic pins.

The watchdog also offers unique features such as

enable-disable, start-up delay.

The WDO delay can be set by factory-programmed

default delay settings or programmed by an external

capacitor. The device also offers a latched output

operation where the output is latched until the

watchdog fault is cleared.

The TPS3435 provides a performance upgrade

alternative to TPS3431 device family. The TPS3435

is available in a small 6-pin WSON and 8-pin SOT-23

package.

Device Information

PART NUMBER

PACKAGE (1)

BODY SIZE (NOM)

(3)

TPS3435

DDF (8)

2.90mm × 1.60mm

TPS3435

DSE (6) 2

1.50mm × 1.50mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

Package preview.

(3)

The package size (length × width) is a nominal value and

includes pins, where applicable.

TPS3435

µC

GPIO

WDI

WD-EN

GPIO

SET[0:1]

GPIO

GND

GND

VDD

VDD

CWD

CRST

GND

TPS3435 offers various pinout options to support different features.

Choose suitable pinout based on application needs

Supply

MR

WDO

RESET / NMI

Typical Application Circuit

Ambient Te mperature (

C)

-40

-7

26

59

92

125

-10

-5

0

5

10

Device lot 1

Device lot 2

Device lot 3

TPS3435

SNVSCF7A – DECEMBER 2022 – REVISED AUGUST 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.