TPS3702AX18DDCR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Voltage Detector
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	--
Voltage - Threshold:	1.8V
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	SOT-23-6 Thin, TSOT-23-6
Supplier Device Package:	TSOT-23-6

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Introduction

TPS3702AX18DDCR is a multi-channel, dual-output, programmable, voltage supervisory device from Texas Instruments. It provides three functions in one package: power-on reset, watchdog timer and power control. Due to its small package, limited current requirement and 11-bit flexible voltage setting, this supervisor IC is commonly used for reliable, low-power and cost-effective systems to ensure the voltage does not drift beyond limits.

Application Field

This device offers an ideal solution for a broad range of applications in the embedded systems, industrial, automotive and consumer markets.Firstly, it is used to protect microprocessor and microcontroller from unwanted low voltages or brownouts in automotive systems and industrial controls. With this device, the voltage regulation can be tighter and more tolerable.Secondly, it can be used in different kinds of safety applications such as engine control systems, airbag systems, and emergency shutdown systems. Thirdly, reflecting the non-volatile or battery-backed feature, this device also provides a viable power-on-reset function in low-power systems.

Working Principle

When power is applied to the VDD (3.3V) voltage supply output, the supervisor monitors the voltage level by comparing a reference voltage (VTH) to the voltage level of VDD. The reference voltage is programmable, so it can be adjusted to the application’s voltage requirements. When the voltage level of VDD is below the reference voltage of VTH, the supervisor will continuously reset the IC until VDD reaches the predefined threshold. However, if VDD only drops momentarily below the voltage threshold, the IC will remain powered up and will not reset. Once VDD voltage is at 3.3V, the supervisor output is turned on and a second output, the watchdog output (WDO), is also set low. Eventually, the device will begin its normal operations.The TPS3702AX18DDCR switches two outputs to signal inactive and active states or high and low voltages, allowing the signal to pass or stop at the appropriate point. As part of the signal monitoring, it continuously monitors the voltage level against the predefined voltage threshold, resetting or powering the device if necessary.

Conclusion

To conclude, TPS3702AX18DDCR is a multi-channel, dual-output, programmable voltage supervisory device used in various applications with its 11-bit flexible voltage setting and low power requirement. Its primary purpose is to provide an early warning of low voltage or brownouts that can damage microprocessor or microcontrollers. The primary application of the device is security, industrial and automotive control, and portable systems. Its working principle includes the use of a reference voltage that is continuously monitored to reset or power up the device when it drops within the defined voltage threshold.

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