ADM691ANZ

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Monitoring and Resetting
• Characteristics: Low-power, Precision, Supervisory Circuit
• Package: 8-pin PDIP (Plastic Dual In-line Package)
• Essence: Monitors voltage levels and provides reset signals to microprocessors and other digital systems.
• Packaging/Quantity: Available in tubes of 50 units or reels of 2,500 units.

Specifications

• Supply Voltage Range: 1.0V to 5.5V
• Reset Threshold Voltage: Adjustable from 2.55V to 4.63V
• Reset Timeout Period: Fixed at 140ms
• Operating Temperature Range: -40°C to +85°C
• Quiescent Current: 20µA (typical)

Pin Configuration

The ADM691ANZ IC has the following pin configuration:

```

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| | --| RESET |-- --| GND |-- --| MR |-- --| VCC |-- --| RESET OUT |-- --| RESET IN |-- --| VCC |-- |___________| ```

Functional Features

• Monitors the supply voltage and asserts a reset signal when it falls below a certain threshold.
• Provides a debounced reset output signal to ensure reliable system reset.
• Offers an adjustable reset threshold voltage to accommodate different system requirements.
• Includes a manual reset input for external reset control.
• Low quiescent current consumption for power-sensitive applications.

Advantages and Disadvantages

Advantages: - Precise voltage monitoring ensures reliable system operation. - Adjustable reset threshold allows flexibility in system design. - Low-power consumption extends battery life in portable devices. - Small form factor and easy integration into various circuit designs.

Disadvantages: - Fixed reset timeout period may not be suitable for all applications. - Limited number of pins restricts the number of external connections.

Working Principles

The ADM691ANZ is a supervisory circuit that continuously monitors the supply voltage of a digital system. When the voltage falls below the user-adjustable threshold, the IC asserts a reset signal to initiate a system reset. The reset output remains active until the supply voltage rises above the threshold and a fixed timeout period elapses. The IC also includes a manual reset input that allows an external signal to force a system reset.

Application Field Plans

The ADM691ANZ is commonly used in various electronic systems where reliable voltage monitoring and resetting are critical. Some application fields include:

1. Microcontroller-based Systems: Ensures proper initialization and reliable operation of microcontrollers.
2. Embedded Systems: Provides a fail-safe mechanism to prevent erratic behavior due to power fluctuations.
3. Industrial Control Systems: Monitors power supply integrity in control units to avoid system malfunctions.
4. Automotive Electronics: Protects sensitive electronic components from voltage dips or spikes.
5. Medical Devices: Ensures safe operation by resetting the system in case of power supply anomalies.

Alternative Models

• ADM690ANZ: Similar functionality but with a fixed reset threshold voltage.
• ADM693ANZ: Offers additional features such as watchdog timer and battery backup switching.

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