TPS3128E12DBVR

Overview

Category: Integrated Circuit (IC)

Use: Voltage Supervisor

Characteristics: - Monitors the voltage level of a power supply - Generates a reset signal when the voltage falls below a specified threshold - Prevents system malfunction due to insufficient power supply voltage

Package: SOT-23 (Small Outline Transistor 23)

Essence: The TPS3128E12DBVR is an integrated circuit that provides voltage supervision and reset generation for microcontrollers, digital processors, and other electronic systems.

Packaging/Quantity: The TPS3128E12DBVR is available in tape and reel packaging, with 3000 units per reel.

Specifications

• Supply Voltage Range: 1.2V to 6V
• Threshold Voltage Options: 1.2V, 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V
• Reset Timeout Period: Adjustable or Fixed (140ms, 560ms, or 1120ms)
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)

Pin Configuration

The TPS3128E12DBVR has the following pin configuration:

____ VDD| |GND RST| |MR GND|____|VDD

• VDD: Power supply input
• GND: Ground reference
• RST: Reset output
• MR: Manual reset input

Functional Features

1. Voltage Monitoring: The TPS3128E12DBVR continuously monitors the power supply voltage and compares it to the programmed threshold voltage.
2. Reset Generation: When the power supply voltage falls below the threshold, the TPS3128E12DBVR generates a reset signal to initiate a system reset.
3. Adjustable Timeout Period: The reset timeout period can be adjusted using an external capacitor or set to a fixed value.
4. Manual Reset: The MR pin allows for manual reset initiation, overriding the voltage monitoring function.

Advantages and Disadvantages

Advantages: - Provides reliable voltage supervision for electronic systems - Adjustable reset timeout period offers flexibility in system design - Low quiescent current minimizes power consumption - Small package size enables space-efficient PCB layout

Disadvantages: - Limited threshold voltage options may not cover all application requirements - Lack of built-in hysteresis may result in potential oscillations near the threshold voltage

Working Principles

The TPS3128E12DBVR operates by comparing the power supply voltage with the programmed threshold voltage. When the power supply voltage drops below the threshold, the internal circuitry triggers the reset output, initiating a system reset. The reset remains active until the power supply voltage rises above the threshold and the reset timeout period elapses.

Application Field Plans

The TPS3128E12DBVR is widely used in various applications where voltage supervision is critical for system reliability. Some potential application fields include:

1. Microcontrollers: Ensuring proper operation and preventing data corruption during power supply fluctuations.
2. Digital Processors: Protecting sensitive digital circuits from voltage dips that could lead to errors or malfunctions.
3. Embedded Systems: Providing a reliable reset mechanism for embedded systems, ensuring stable operation after power-up or power loss events.
4. Industrial Control Systems: Monitoring power supply integrity in industrial control systems to prevent equipment damage or malfunction.

Alternative Models

1. TPS3125: Similar voltage supervisor IC with adjustable reset timeout and a wider range of threshold voltage options.
2. MAX823: Voltage monitor and reset generator IC with adjustable timeout period and additional features like power-on reset delay.

These alternative models offer similar functionality to the TPS3128E12DBVR and can be considered based on specific application requirements.

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