ADM691SQ

Product Overview

Category: Integrated Circuits (ICs)

Use: Voltage Monitoring and Reset Circuits

Characteristics: - Monitors the power supply voltage level - Generates a reset signal when the voltage falls below a specified threshold - Ensures proper operation of microcontrollers and other digital systems - Provides protection against power supply fluctuations and brownouts

Package: SOP (Small Outline Package)

Essence: The ADM691SQ is a voltage monitoring and reset circuit designed to ensure the reliable operation of electronic devices by monitoring the power supply voltage and generating a reset signal when necessary.

Packaging/Quantity: The ADM691SQ is available in SOP packages. The quantity per package may vary depending on the supplier.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Threshold Voltage Options: 4.65V, 4.40V, 4.00V, 3.08V, 2.93V, 2.63V
• Reset Timeout Period: Adjustable from 1ms to 10s
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The ADM691SQ has the following pin configuration:

1. VCC: Power supply input
2. GND: Ground reference
3. RESET: Active-low reset output
4. MR: Manual reset input
5. TO: Timeout period selection pin
6. VTH: Voltage threshold selection pin

Functional Features

1. Voltage Monitoring: The ADM691SQ continuously monitors the power supply voltage to ensure it remains within the desired range.
2. Reset Signal Generation: When the voltage falls below the specified threshold, the ADM691SQ generates an active-low reset signal to initiate a system reset.
3. Adjustable Timeout Period: The reset timeout period can be adjusted to meet the specific requirements of the application.
4. Manual Reset: The ADM691SQ provides a manual reset input (MR) for initiating a system reset externally.
5. Voltage Threshold Selection: The voltage threshold can be selected using the VTH pin, allowing flexibility in setting the desired threshold level.

Advantages and Disadvantages

Advantages: - Ensures reliable operation of electronic devices by monitoring the power supply voltage - Protects against power supply fluctuations and brownouts - Adjustable timeout period for customization - Manual reset option for external control

Disadvantages: - Limited voltage threshold options - SOP package may not be suitable for all applications

Working Principles

The ADM691SQ operates by continuously monitoring the power supply voltage using an internal voltage reference. When the voltage falls below the specified threshold, the reset output is activated, initiating a system reset. The timeout period determines how long the reset signal remains active after the voltage returns to the normal range. The ADM691SQ also provides a manual reset option for external control.

Detailed Application Field Plans

The ADM691SQ is widely used in various applications where reliable voltage monitoring and reset functionality are essential. Some common application fields include:

1. Microcontroller Systems: The ADM691SQ ensures proper operation of microcontrollers by monitoring the power supply voltage and generating a reset signal when necessary.
2. Embedded Systems: It is commonly used in embedded systems to protect against power supply fluctuations and ensure system stability.
3. Industrial Automation: The ADM691SQ finds applications in industrial automation systems where uninterrupted operation is critical.
4. Consumer Electronics: It is used in consumer electronics devices such as smart home systems, IoT devices, and digital appliances to maintain reliable operation.

Detailed and Complete Alternative Models

1. MAX691A - Voltage Monitoring and Reset Circuit
2. LTC2910 - Precision Voltage Monitor and Reset Controller
3. TPS3808 - Voltage Supervisor with Programmable Delay Time
4. ADM708 - Microprocessor Supervisory Circuit

These alternative models offer similar functionality to the ADM691SQ and can be considered as alternatives based on specific application requirements.

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