基于TPS3808-Q1的低静态电流可编程延迟监控电路

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基于TPS3808-Q1的低静态电流可编程延迟监控电路

　　1 Features

　　Qualified for Automotive Applications

　　Power-On Reset Generator With Adjustable Delay Time: 1.25 ms to 10 s

　　Very Low Quiescent Current: 2.4 μA Typical

　　High Threshold Accuracy: 0.5% Typical

　　Fixed Threshold Voltages for Standard Voltage Rails From 1.2 V to 5 V and Adjustable Voltage Down to 0.4 V Are Available

　　Manual Reset (MR) Input

　　Open-Drain RESET Output

　　Temperature Range: –40°C to +125°C

　　Small SOT-23 Package and WSON Package (TPS3808G01QDRVRQ1 only)

　　2 Applications

　　DSP or Microcontroller Applications

　　FPGA and ASIC Applications

　　Automotive Vision

Automotive Radar

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　　3 Description

　　The TPS3808Gxx-Q1 microprocessor supervisory circuits monitor system voltages from 0.4 V to 5 V, asserting an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin drops to a logic low. The RESET output remains low for the user-adjustable delay time after the SENSE voltage and MR return above their thresholds.

　　The TPS3808Gxx-Q1 device uses a precision reference to achieve 0.5% threshold accuracy for VIT ≤ 3.3 V. The reset delay time can be set to 20 ms by disconnecting the CT pin, 300 ms by connecting the CT pin to VDD using a resistor, or can be user-adjusted from 1.25 ms to 10 s by connecting the CT pin to an external capacitor. The TPS3808Gxx-Q1 has a very low typical quiescent current of 2.4 μA, so it is well suited for battery-powered applications. The device is available in a small SOT-23 package (one option available in WSON) and is fully specified over a temperature range of –40°C to +125°C (TJ).