Overview
The ADM691ARZ-REEL7, produced by Analog Devices Inc., is a microprocessor supervisory circuit designed to provide comprehensive power supply monitoring and battery control functions in microprocessor systems. This IC is part of the ADM691A/ADM693A/ADM800L/ADM800M family and offers features such as precision voltage monitoring, watchdog timer, and automatic battery backup switchover. It is particularly useful in ensuring the reliable operation of microprocessors by providing reset signals during power-up and power-down conditions, and by monitoring the system's power supply to prevent data loss or system failure.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Operating Voltage Range (VCC) | 4.5 | - | 5.5 | V | ADM691A, ADM800L; 4.5 V to 5.5 V for ADM693A, ADM800M |
| Reset Voltage Threshold | 4.5 | 4.65 | 4.75 | V | ADM691A, ADM800L; 4.25 V to 4.50 V for ADM693A, ADM800M |
| Reset Threshold Hysteresis | - | - | 15 mV | - | - |
| VCC to RESET Delay | - | 80 µs | - | - | - |
| Reset Timeout Period (Internal Oscillator) | 140 ms | 200 ms | 280 ms | - | - |
| Watchdog Timeout Period (Internal Oscillator) | 1.0 s | 1.6 s | 2.25 s | - | Long period |
| Minimum WDI Input Pulse Width | - | - | 100 ns | - | - |
| Output Resistance (VCC to VOUT) | 0.8 Ω | 1.2 Ω | - | - | VCC = 4.5 V |
Key Features
- Precision Voltage Monitoring: The ADM691ARZ-REEL7 features precision voltage monitoring with a tolerance of ±2% on the reset threshold voltage.
- Low Power Consumption: It has a low standby current of approximately 1 µA.
- Watchdog Timer: The IC includes an adjustable watchdog timer with both short and long periods.
- Automatic Battery Backup Switchover: It provides automatic switchover to a backup battery when the main power supply fails.
- Fast Onboard Gating of Chip Enable Signals: This feature allows for quick control of chip enable signals.
- Multiple Package Options: Available in 16-SOIC package among others.
Applications
- Microprocessor Systems: Ideal for monitoring and controlling power supplies in microprocessor-based systems.
- Computers and Controllers: Used in various computer and controller applications to ensure reliable power supply and system operation.
- Intelligent Instruments: Suitable for use in intelligent instruments that require precise power monitoring.
- Automotive Systems: Applied in automotive systems for critical power monitoring and control.
Q & A
- What is the primary function of the ADM691ARZ-REEL7? The primary function is to provide power supply monitoring and battery control functions in microprocessor systems.
- What is the operating voltage range for the ADM691A and ADM800L models? The operating voltage range is 4.5 V to 5.5 V for the ADM691A and ADM800L models.
- What is the reset voltage threshold for the ADM691A and ADM800L models? The reset voltage threshold is 4.5 V to 4.75 V for the ADM691A and ADM800L models.
- How long does the reset signal remain low after power-up? The reset signal remains low for 200 milliseconds after VCC rises above the reset threshold.
- Does the ADM691ARZ-REEL7 support external clock input for the watchdog timer? Yes, it supports both internal oscillator and external clock input for the watchdog timer.
- What is the minimum WDI input pulse width required? The minimum WDI input pulse width is 100 ns.
- What is the typical output resistance of the VCC to VOUT path? The typical output resistance is 1.2 Ω when VCC is 4.5 V.
- In which package is the ADM691ARZ-REEL7 available? It is available in a 16-SOIC package.
- What are some common applications of the ADM691ARZ-REEL7? Common applications include microprocessor systems, computers, controllers, intelligent instruments, and automotive systems.
- Does the ADM691ARZ-REEL7 support automatic battery backup switchover? Yes, it supports automatic switchover to a backup battery when the main power supply fails.
