1 Features

• AEC-Q100 qualified with the following results:

– Device temperature grade 1: –40°C to 125°C

ambient operating temperature range

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

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

• 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

• 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

• On-board (OBC) and wireless charger

• Driver monitoring

• Battery Management System (BMS)

• Front camera

• Surround view system ECU

3 Description

The TPS3435-Q1 is an ultra-low power consumption

(250 nA typical) device offering a programmable

watchdog timer.

The TPS3435-Q1 offers a high accuracy watchdog

timer with a host of features for a wide variety

of applications. The watchdog timer can be factory

programmed or user programmed using an external

capacitor. The timer value can be changed on-thefly

using a combination of logic pins. The watchdog

feature can be enabled or disabled using a dedicated

pin or combination of timer extension pins. The device

also offers start-up delay options to disable watchdog

monitoring for fixed time immediately after host power

up.

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-Q1 is available in a small 8-pin SOT23

package.