Overview
The ADM694AN, produced by Analog Devices Inc., is a microprocessor supervisory circuit designed to provide comprehensive power management and monitoring functions for microprocessor systems. This component is part of the ADM690-ADM695 family and is specifically tailored to ensure reliable operation during various power conditions, including power-up, power-down, and brownout scenarios.
The ADM694AN is available in an 8-pin DIP package and integrates several critical functions such as power-on reset, battery backup switching, watchdog timer, and power failure warning. These features make it an essential component for maintaining the integrity and stability of microprocessor-based systems.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions/Comments |
|---|---|---|---|---|---|
| VCC Operating Voltage Range | 4.75 | 5.5 | V | ||
| VBATT Operating Voltage Range | 2.0 | 4.25 | V | ||
| Reset Pulse Width | 200 ms | ||||
| Watchdog Timeout Period | 1.6 s | ||||
| Supply Current (Excludes IOUT) | 1 | 1.95 mA | IOUT = 100 mA | ||
| Battery Standby Current | 0.6 | 1 µA | VCC = 0 V, VBATT = 2.8 V | ||
| Battery Switchover Threshold | 70 mV |
Key Features
- Power-on Reset Output: Provides a reset signal during power-up, power-down, and brownout conditions. The RESET output remains operational with VCC as low as 1 V.
- Battery Backup Switching: Automatically switches to battery backup for CMOS RAM, CMOS microprocessor, or other low power logic when the main power supply (VCC) fails.
- Watchdog Timer: Generates a reset pulse if the optional watchdog timer has not been toggled within a specified time (1.6 seconds for ADM694AN).
- Power Failure Warning: Includes a 1.3 V threshold detector for power fail warning, low battery detection, or monitoring a power supply other than +5 V.
Applications
- Microprocessor Systems: Ensures reliable operation of microprocessors during various power conditions.
- Computers and Controllers: Provides essential power management functions for computer systems and control units.
- Intelligent Instruments: Suitable for use in intelligent instruments that require robust power monitoring and backup capabilities.
- Automotive Systems: Can be used in automotive systems where reliable power management is critical.
Q & A
- What is the primary function of the ADM694AN?
The primary function of the ADM694AN is to provide power management and monitoring for microprocessor systems, including power-on reset, battery backup switching, watchdog timer, and power failure warning.
- What is the operating voltage range for VCC in the ADM694AN?
The operating voltage range for VCC is 4.75 V to 5.5 V.
- How does the battery backup switching work in the ADM694AN?
The battery backup switching circuit compares VCC to VBATT and connects VOUT to whichever is higher, ensuring continuous power supply to the microprocessor system.
- What is the watchdog timeout period for the ADM694AN?
The watchdog timeout period is 1.6 seconds.
- What is the reset pulse width for the ADM694AN?
The reset pulse width is 200 ms.
- What is the supply current (excluding IOUT) for the ADM694AN?
The supply current (excluding IOUT) is typically 1.95 mA when IOUT is 100 mA.
- How does the power failure warning function work?
The power failure warning function uses a 1.3 V threshold detector to monitor power supply conditions and provide a warning signal for low battery or power failure.
- In what package is the ADM694AN available?
The ADM694AN is available in an 8-pin DIP package.
- What are some typical applications of the ADM694AN?
Typical applications include microprocessor systems, computers, controllers, intelligent instruments, and automotive systems.
- Is the ADM694AN still in production?
As of the current information, there is no indication that the ADM694AN has been discontinued, but it is always best to check with the manufacturer or recent product notices for the most up-to-date information.
