Overview
The ADM697AR, 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 component is part of the ADM696/ADM697 family, which offers advanced features for ensuring reliable operation of microprocessors under various power conditions.
The ADM697AR is particularly useful in applications requiring power-on reset, watchdog timer functionality, and battery backup switching. It operates over a wide voltage range and is fabricated using an advanced epitaxial CMOS process, ensuring low power consumption and high reliability.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 3.0 | 5.5 | V | ||
| VBATT Operating Voltage Range | 2.0 | VCC - 0.3 | V | ||
| VOUT Output Voltage (IOUT = 1 mA) | VCC - 0.05 | VCC - 0.025 | VCC - 0.5 | V | |
| VOUT Output Voltage (IOUT ≤ 100 mA) | VCC - 0.05 | VCC - 0.025 | VCC - 0.25 | V | |
| Supply Current (Excludes IOUT) | 1 | 1.95 | mA | IOUT = 100 mA | |
| Standby Current | 600 | nA | |||
| Reset Voltage Threshold | 1.3 | V | Adjustable using external voltage divider | ||
| Watchdog Timeout Period | 100 ms | 1.6 s | Adjustable |
Key Features
- Power-On Reset Output: Provides a reset signal during power-up, power-down, and brownout conditions, with the reset output remaining operational down to 1 V VCC.
- Watchdog Timer: Generates a reset pulse if the watchdog timer is not toggled within a specified time, with adjustable timeout periods.
- Battery Backup Switching: Automatically switches to battery backup for CMOS RAM, CMOS microprocessors, or other low-power logic (available in ADM696).
- Low Line Voltage Monitoring: Includes a 1.3 V threshold detector for power fail warning, low battery detection, or monitoring other power supplies.
- Fast Chip Enable Gating: Provides extremely fast on-board gating of chip enable signals, ensuring quick response times.
- Low Power Consumption: Operates with low power consumption of approximately 5 mW.
- High Reliability: Fabricated using an advanced epitaxial CMOS process, ensuring high reliability and minimal voltage drop.
Applications
- Microprocessor Systems: Ensures reliable operation of microprocessors by monitoring power supply conditions and providing necessary reset and backup functions.
- Computers and Controllers: Used in various computer and controller systems to manage power supply and battery backup.
- Intelligent Instruments: Suitable for intelligent instruments that require precise power monitoring and control.
- Automotive Systems: Applied in automotive systems for critical power monitoring and battery management.
- Critical Power Monitoring: Ideal for applications requiring stringent power monitoring and control, such as in medical devices and industrial control systems.
Q & A
- What is the operating voltage range of the ADM697AR?
The ADM697AR operates over a voltage range of 3.0 V to 5.5 V.
- What is the function of the watchdog timer in the ADM697AR?
The watchdog timer generates a reset pulse if it is not toggled within a specified time, helping to prevent system lockups.
- Does the ADM697AR support battery backup switching?
No, the ADM697AR does not support battery backup switching; this feature is available in the ADM696 model.
- What is the typical standby current of the ADM697AR?
The typical standby current of the ADM697AR is 600 nA.
- How does the ADM697AR handle power-on reset?
The ADM697AR provides a power-on reset output during power-up, power-down, and brownout conditions, with the reset output remaining operational down to 1 V VCC.
- What is the reset voltage threshold of the ADM697AR?
The reset voltage threshold of the ADM697AR is adjustable using an external voltage divider, with a typical value of 1.3 V.
- What are the common applications of the ADM697AR?
The ADM697AR is commonly used in microprocessor systems, computers, controllers, intelligent instruments, and automotive systems.
- What package types are available for the ADM697AR?
The ADM697AR is available in 16-pin DIP and small outline packages (SOIC).
- How does the ADM697AR handle low line voltage monitoring?
The ADM697AR includes a 1.3 V threshold detector for power fail warning, low battery detection, or monitoring other power supplies.
- What is the maximum output current of the ADM697AR?
The ADM697AR can drive up to 100 mA without the need for an external pass transistor.
