TPS3820-50DBVR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	15 ms Minimum
Voltage - Threshold:	4.55V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-74A, SOT-753
Supplier Device Package:	SOT-23-5
Base Part Number:	TPS3820-50

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TPS3820-50DBVR Application Field and Working Principle

Introduction

The TPS3820-50DBVR is a low power, high performance Supervisor from Texas Instruments. The device is offered in small packages and has a unique enabled feature to prevent problems when the device is powered down. It is well suited for many different applications, most notably in digital video recorder (DVR) systems, microcontrollers, or digital audio systems. The TPS3820-50DBVR is capable of providing a precision, temperature compensated reset output in response to under or over voltage conditions or power-on reset applications. With its many features, the TPS3820-50DBVR is an ideal choice for applications where a high level of reliability is required.

Application Field

The TPS3820-50DBVR is a supervisor that is designed for a wide variety of components, from communication interface busses and LCD displays to general purpose logic circuits. It is designed for applications where a high level of reliability is required. It is suitable for applications such as embedded microcontrollers, digital video recorders (DVRs), digital audio systems, set top boxes, and other types of consumer electronic equipment. The TPS3820-50DBVR also is used in automotive and avionics applications, as it is capable of providing a precision, temperature compensated reset output.

Features

The TPS3820-50DBVR can detect both under voltage and over voltage conditions, as well as power-on reset applications. It is capable of operating at temperatures of -40°C to +125°C, with a specified accuracy at temperature extremes. It features a low power-up voltage of 2.2V, an adjustable reset threshold voltage (VTHₓ), and a reset output open-drain with active low logic. The device also features a reset active flag, which provides an indication of active or inactive reset state. The TPS3820-50DBVR offers a watchdog timer function with a wide range of intervals, from 20ms to 255 seconds. It also has an adjustable reset assertion time and adjustable reset timeout. Finally, the device has a power-saving mode that can reduce power consumption by up to 90% in low power state.

Design

The TPS3820-50DBVR is designed to be integrated into a circuit easily. It is available in three packages: SOIC-8, DFN-6, and SC-70-5. It is configured for operation by setting a few parameters and testing for output voltage levels. The device can be configured by setting the VTHₓ pin, which is an adjustable voltage threshold. This is done by connecting a resistor to the VTHₓ pin and measuring the voltage drop across the VTHₓ pin. The adjustable reset timeout and assertion time are also configured by setting time-constant resistors. The watchdog timer period is programmed by setting a resistor from the WDT pin to ground.

Working Principle

The TPS3820-50DBVR is a supervisor device that monitors power and reset conditions. It monitors the VTHₓ pin, which is an adjustable voltage threshold. If the voltage exceeds the VTHₓ voltage level, then the reset output goes high and the reset active flag is asserted. At the same time, the WDT timer is started. If the reset input is deasserted, the reset output goes back low and the reset active flag is deasserted. The WDT timer runs in the background and monitors the reset input. If the reset input is asserted, the WDT timer will reset the processor. The reset timeout and assertion time can be adjusted with the time-constants. Finally, the device also has a power-saving mode which reduces power consumption by up to 90%.

Conclusion

The TPS3820-50DBVR is a low power, high performance supervisor from Texas Instruments. It is designed for a wide variety of components, from communication interface busses to LCD displays. It is suitable for applications such as embedded microcontrollers, digital video recorders (DVRs), digital audio systems, set top boxes, and other types of consumer electronic equipment. The device offers many features, such as adjustable reset timeout, watchdog timer, and power-saving mode. Additionally, the device can detect both under voltage and over voltage conditions, as well as power-on reset applications. Overall, the TPS3820-50DBVR is an ideal choice for applications where a high level of reliability is required. It is a robust supervisor device with a wide range of features and capabilities.

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