ADM690SQ

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Supervisor
• Characteristics: Precision monitoring, low power consumption, small form factor
• Package: SOP-8 (Small Outline Package)
• Essence: ADM690SQ is a voltage supervisor IC designed to monitor the power supply voltage of electronic systems and provide reset signals when necessary.
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Reset Threshold Voltage: Adjustable from 1.6V to 4.6V
• Reset Timeout Period: Adjustable from 1ms to 640ms
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 10µA (typical)

Detailed Pin Configuration

ADM690SQ follows the standard SOP-8 pin configuration:

1. VCC: Supply voltage input
2. GND: Ground reference
3. MR: Manual reset input
4. RESET: Reset output
5. CT: Capacitor connection for reset timeout adjustment
6. TH: Threshold voltage adjustment pin
7. NC: No connection
8. VCC: Supply voltage input

Functional Features

• Voltage Monitoring: ADM690SQ continuously monitors the supply voltage and generates a reset signal when it falls below the user-defined threshold.
• Adjustable Threshold: The threshold voltage can be adjusted using an external resistor, allowing customization for different system requirements.
• Reset Timeout: The reset signal remains active for a user-defined period after the supply voltage rises above the threshold, preventing premature system operation during power-up.
• Manual Reset: A manual reset input allows for immediate system reset regardless of the monitored voltage level.

Advantages and Disadvantages

Advantages: - Precision monitoring ensures reliable system operation. - Low power consumption minimizes energy usage. - Small form factor enables space-efficient designs.

Disadvantages: - Limited reset timeout range may not suit all applications. - Lack of built-in hysteresis may lead to potential oscillations near the threshold voltage.

Working Principles

ADM690SQ operates by comparing the supply voltage with the user-adjustable threshold voltage. When the supply voltage drops below the threshold, the reset output is activated, indicating a power failure. The reset signal remains active for the duration set by the external capacitor connected to the CT pin. Once the supply voltage rises above the threshold and the reset timeout period elapses, the reset output deactivates, allowing the system to resume normal operation.

Detailed Application Field Plans

ADM690SQ finds applications in various electronic systems where reliable voltage monitoring and reset functionality are crucial. Some common application fields include:

1. Microcontrollers: Ensuring proper initialization and safe operation during power-up.
2. Industrial Control Systems: Preventing erratic behavior and data corruption due to power fluctuations.
3. Automotive Electronics: Protecting sensitive components from voltage transients and ensuring system integrity.
4. Medical Devices: Guaranteeing reliable operation and patient safety by monitoring power supply stability.
5. Communication Equipment: Maintaining uninterrupted communication by resetting the system in case of power disturbances.

Alternative Models

For users seeking alternative options, the following voltage supervisor ICs can be considered:

1. MAX691: Similar functionality with adjustable threshold and reset timeout, available in different package options.
2. LTC2910: Offers additional features like programmable reset delay and watchdog timer.
3. TPS3808: Provides integrated hysteresis for improved noise immunity and adjustable reset threshold.

These alternatives offer similar voltage monitoring and reset capabilities, catering to diverse application requirements.

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