TPS35 Nano IQ Precision Voltage Supervisor with Precision Timeout Watchdog Timer

1 Features

• Factory programmed or user-programmable

watchdog timeout

– ±10% Accurate timer (maximum)

– Factory programmed: 1 msec to 100 sec

• Factory programmed or user-programmable reset

delay

– ±10% Accurate timer (maximum)

– Factory programmed option: 2 msec to 10 sec

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

• Fixed threshold voltage (VIT-): 1.05 V to 5.4 V

– Threshold voltage available in 50 mV steps

– 1.2% Voltage threshold accuracy (maximum)

– Built-in hysteresis (VHYS): 5% (typical)

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

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

• Various programmability options:

– Watchdog enable-disable

– Watchdog startup delay: no delay to 10 sec

– 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 TPS35 is an ultra-low power consumption

(250 nA typical) device offering a precision voltage

supervisor with a programmable timeout watchdog

timer. The TPS35 supports wide threshold levels for

undervoltage supervision with 1.2% accuracy across

the specified temperature range.

The TPS35 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, independent WDO pin option.

The RESET or 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

supervisor or watchdog fault is cleared.

The

TPS35

provides

a

performance

upgrade

alternative to TPS3851 device family. The TPS35 is

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

package.

Device Information

PART NUMBER

PACKAGE (1)

BODY SIZE (NOM)

TPS35

DDF (8)

2.90 mm × 1.60 mm

TPS35

DSE (6)

1.50 mm × 1.50 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

TPS35

µC

GPIO

WDI

WD-EN

GPIO

SET[0:1]

GPIO

GND

GND

VDD

VDD

CWD

CRST

GND

TPS35 offers various pinout options to support different features.

Choose suitable pinout based on application needs

Supply

MR

RESET

WDO

NMI

RESET

Typical Application Circuit

Ambient Temperature (

C)

-40

-7

26

59

92

125

-10

-5

0

5

10

Device lot 1

Device lot 2

Device lot 3

TPS35

SNVSCF5A – JUNE 2023 – REVISED DECEMBER 2023

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.