Overview
The ADM691AR-REEL, 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 ADM691A/ADM693A/ADM800L/ADM800M family and is available in a 16-pin SOIC package. It offers a range of features including power-on reset, battery backup switching, watchdog timer, and power failure warning, making it an essential component for ensuring the reliability and stability of microprocessor-based systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Operating Voltage Range (VCC) | 4.75 | 5.5 | V | ||
| Operating Voltage Range (VBATT) | 2.0 | 4.25 | V | ||
| Reset Threshold Voltage | 4.65 | V | |||
| Reset Timeout Period | 50 ms or Adjustable | ||||
| Watchdog Timeout Period | 100 ms, 1.6 s, or Adjustable | ||||
| Output Voltage (VOUT) in Battery Backup Mode | VCC - 0.05 | VCC - 0.025 | VCC - 0.5 | V | IOUT = 1 mA |
| 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 | |
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- Power-on Reset Output: Provides a reset signal during power-up, power-down, and brownout conditions, remaining operational with VCC as low as 1 V.
- Battery Backup Switching: Automatically switches to battery backup for CMOS RAM, CMOS microprocessors, or other low-power logic when VCC falls below a specified threshold.
- Watchdog Timer: Generates a reset pulse if the optional watchdog timer is not toggled within a specified time (100 ms, 1.6 s, or adjustable).
- Power Failure Warning: Includes a 1.25 V threshold detector for power fail warning, low battery detection, or monitoring a power supply other than +5 V.
- CMOS RAM Write Protection: Provides write protection for CMOS RAM or EEPROM.
- Adjustable Reset and Watchdog Timeout Periods: Allows for adjustable reset and watchdog timeout periods.
- Low Power Consumption: Features low power consumption with a standby current of 1 µA.
- Multiple Package Options: Available in 16-pin DIP, SO, and TSSOP packages.
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 management.
- 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 backup functions.
- Critical Power Monitoring: Essential for any system requiring robust power monitoring and backup capabilities.
Q & A
- What is the primary function of the ADM691AR-REEL?
The primary function of the ADM691AR-REEL is to provide power supply monitoring and battery control functions in microprocessor systems.
- What are the operating voltage ranges for VCC and VBATT?
The operating voltage range for VCC is 4.75 V to 5.5 V, and for VBATT, it is 2.0 V to 4.25 V.
- What is the reset threshold voltage for the ADM691AR-REEL?
The reset threshold voltage is 4.65 V.
- Does the ADM691AR-REEL have an adjustable watchdog timeout period?
- What is the typical standby current of the ADM691AR-REEL?
The typical standby current is 1 µA.
- In what packages is the ADM691AR-REEL available?
The ADM691AR-REEL is available in 16-pin DIP, SO, and TSSOP packages.
- What is the purpose of the battery backup switching feature?
The battery backup switching feature automatically switches to battery backup when VCC falls below a specified threshold to ensure continuous operation of CMOS RAM and other low-power logic.
- Does the ADM691AR-REEL provide write protection for CMOS RAM or EEPROM?
- What are some common applications of the ADM691AR-REEL?
- Is the ADM691AR-REEL RoHS compliant?
