TIDA-010041 Reference Design

Texas Instruments

Nano power: wide VIN (12 V max) supervisor reference design used as comparator or power sequencer

Description

This reference design highlights a versatile use case for a low-power reset IC and a watchdog timer. With less than 1-µA current consumption, the TPS3840 device can be configured to work either as a comparator (with simple 3-pin configuration) or as a universal power supply supervisor that can be daisychained as a sequencer. Additionally, the response and delay time can be configured using an external capacitor. For applications requiring a watchdog operation, the TPS3431 device, a stand-alone programmable watchdog timer with ±2.5% accuracy (typ) can be used.

Features
  • Threshold detection (TPS3840): Self-powered threshold detector using a voltage supervisor as a comparator (with 3-pin configuration and no external power supply) - Very low quiescent current (<700 nA) architectures with a set threshold from 1.6 V–4.9 V in 0.1-V steps and fast power-on (<250-µs startup delay) with a user-controllable response time (80 µs to 600 ms using external capacitor)
  • Reset for power supply supervision and sequencing (TPS3840): Useful for multirail reset supervision and startup sequencing - Active low and active high configurations available with thresholds from 1.6 V–4.9 V and TD from 80 µs–600 ms
  • Watchdog timer (TPS3431): User-adjustable timer with enable pin and wide input range - Low current consumption (20 µA maximum) for watchdog function and user-configurable timeout using an external resistor and capacitor
Applications
  • Micro inverter
  • Fault indicator (FI)
  • Binary input module
  • Traffic monitoring camera
Product Categories
  • Power Management

Parts

Part Number Name Companion Part
OPA320SAIDBVT OPA320SAIDBVT Buy Datasheet
TPS3431SDRBR TPS3431SDRBR Buy Datasheet
TVS0500DRVR TVS0500DRVR Buy Datasheet
TVS1400DRVR TVS1400DRVR Buy Datasheet

Bill Of Materials

Download the bill of materials for TIDA-010041 Download

Schematic

Quickly understand overall system functionality.

Download the schematic for TIDA-010041

Test Data

Get results faster with test and simulation data that's been verified.

Download the test file for TIDA-010041

Other Documents

Title Updated Type Size (KB)
Nano Power, Wide VIN (12 V max) Supervisor Reference Design 19 Dec 2018 PDF 4995
TIDA-010041 Gerber 19 Dec 2018 ZIP 382
TIDA-010041 CAD Files 19 Dec 2018 ZIP 1645
TIDA-010041 PCB 19 Dec 2018 PDF 961
TIDA-010041 Assembly Drawing 19 Dec 2018 PDF 341
TIDA-010041 BOM 19 Dec 2018 PDF 48
TIDA-010041 Schematic and Block Diagram 19 Dec 2018 PDF 514