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TPS3813-Q1

ACTIVE

Automotive voltage supervisor (reset IC) with programmable window watchdog

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Data sheet

TPS3813-Q1

ACTIVE
Data sheet Order now

Product details

Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.93, 4.55 Features Reset time delay, Undervoltage and overvoltage monitor, Watchdog timer, Window watchdog Reset threshold accuracy (%) 2, 2.2 Iq (typ) (mA) 0.009 Output driver type/reset output Active-low, Open-drain Time delay (ms) 25 Supply voltage (min) (V) 2 Supply voltage (max) (V) 6 TI functional safety category Functional Safety-Capable Rating Automotive Watchdog timer WDI (s) Programmable Operating temperature range (°C) -40 to 125
Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.93, 4.55 Features Reset time delay, Undervoltage and overvoltage monitor, Watchdog timer, Window watchdog Reset threshold accuracy (%) 2, 2.2 Iq (typ) (mA) 0.009 Output driver type/reset output Active-low, Open-drain Time delay (ms) 25 Supply voltage (min) (V) 2 Supply voltage (max) (V) 6 TI functional safety category Functional Safety-Capable Rating Automotive Watchdog timer WDI (s) Programmable Operating temperature range (°C) -40 to 125
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM classification level 2
    • Device CDM classification level C4B
  • Window-watchdog with programmable delay and window ratio
  • 6-Pin SOT-23 package
  • Supply current of 9 µA (Typical)
  • Power-on reset generator with a fixed delay time of 25 ms
  • Precision supply-voltage monitor (VIT): 2.5 V, 3 V, 3.3 V, 5 V
  • Open-drain reset output
  • Qualified for automotive applications
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM classification level 2
    • Device CDM classification level C4B
  • Window-watchdog with programmable delay and window ratio
  • 6-Pin SOT-23 package
  • Supply current of 9 µA (Typical)
  • Power-on reset generator with a fixed delay time of 25 ms
  • Precision supply-voltage monitor (VIT): 2.5 V, 3 V, 3.3 V, 5 V
  • Open-drain reset output

The TPS3813-Q1 supervisory circuits provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems.

During power on, the RESET pin is asserted when the supply voltage (VDD) becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDD and keeps the RESET pin active as long as VDD remains below the threshold voltage (VIT).

An internal timer delays the return of the output to the inactive (high) state to ensure proper system reset. The delay time, td = 25 ms typical, begins after VDD has risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider.

For safety-critical applications, the TPS3813-Q1 family of device s incorporate a window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting the WDT pin to GND or VDD, or by using an external capacitor. The lower limit, and thus the window ratio, is set by connecting the WDR pin to GND or VDD. The RESET pin will assert a reset to the microcontroller if the watchdog is incorrectly serviced.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The device s are available in a 6-pin SOT-23 package. The device s are characterized for operation over a temperature range of –40°C to 125°C.

The TPS3813-Q1 supervisory circuits provide circuit initialization and timing supervision, primarily for DSPs and processor-based systems.

During power on, the RESET pin is asserted when the supply voltage (VDD) becomes higher than 1.1 V. Thereafter, the supervisory circuit monitors VDD and keeps the RESET pin active as long as VDD remains below the threshold voltage (VIT).

An internal timer delays the return of the output to the inactive (high) state to ensure proper system reset. The delay time, td = 25 ms typical, begins after VDD has risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider.

For safety-critical applications, the TPS3813-Q1 family of device s incorporate a window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting the WDT pin to GND or VDD, or by using an external capacitor. The lower limit, and thus the window ratio, is set by connecting the WDR pin to GND or VDD. The RESET pin will assert a reset to the microcontroller if the watchdog is incorrectly serviced.

The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The device s are available in a 6-pin SOT-23 package. The device s are characterized for operation over a temperature range of –40°C to 125°C.
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Technical documentation

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Type Title Date
* Data sheet TPS3813-Q1 Automotive Processor Supervisory Circuits With Window-Watchdog datasheet (Rev. H) PDF | HTML 09 Sep 2021
Functional safety information TPS3813-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 25 Nov 2020
Application note Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) 17 Mar 2020
Functional safety information TPS3813-Q1 Functional Safety FIT Rate and Failure Mode Distribution 18 Dec 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Application note Window Watchdog Calculator for TPS3813 Voltage Supervisors (Rev. A) 13 Sep 2016
Application note All Window Watchdog Supervisors 09 Sep 2009

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Evaluation board

TPS3813Q1EVM — Evaluation module for the TPS3813-Q1 processor supervisory circuit with window watchdog

The TPS3813-Q1 device is a processor supervisory circuit with watchdog functionality for applications that use DSPs, microcontrollers (MCUs) or microprocessors, or are safety critical. The incorporated window watchdog allows for programmable delay and window ratio that can realease a (...)
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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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