Overview
The ADM691AN, 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 a range of features to ensure reliable operation of microprocessors under various power conditions.
The ADM691AN is particularly useful in systems that require power-on reset, battery backup switching, watchdog timer functionality, and power failure warnings. It is available in a 16-pin DIP package and also in a space-saving TSSOP package, making it versatile for different design requirements.
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 | 4.65 | V | ±3% | ||
| Reset Timeout | 50 ms | Adjustable (100 ms, 1.6 s) | |||
| Watchdog Timeout | 100 ms | 1.6 s | Adjustable | ||
| Battery Backup Switching | Yes | ||||
| Chip Enable Signals | Yes | ||||
| Standby Current | 600 nA | VCC = 0 V, VBATT = 2.8 V | |||
| Operating Temperature Range | -40°C | 85°C |
Key Features
- Power-on Reset Output: Provides reset output 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 VBATT.
- Watchdog Timer: Generates a reset pulse if the watchdog timer has not been 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.
- Low Power Consumption: Features a low standby current of 600 nA when VCC is 0 V and VBATT is 2.8 V.
- Adjustable Reset and Watchdog Timeout: Allows for adjustable reset and watchdog timeout periods.
- Chip Enable Signals: Provides onboard gating of chip enable signals.
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 monitoring.
- Intelligent Instruments: Suitable for use in intelligent instruments that require precise power management.
- Automotive Systems: Applied in automotive systems for critical power monitoring and control.
Q & A
- What is the primary function of the ADM691AN?
The primary function of the ADM691AN is to provide power supply monitoring and battery control functions in microprocessor systems, including power-on reset, battery backup switching, watchdog timer, and power failure warnings.
- What is the operating voltage range 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 ADM691AN?
The reset threshold voltage is 4.65 V with a ±3% tolerance.
- Can the reset and watchdog timeout periods be adjusted?
Yes, the reset and watchdog timeout periods can be adjusted (100 ms, 1.6 s, or adjustable).
- What is the standby current of the ADM691AN?
The standby current is 600 nA when VCC is 0 V and VBATT is 2.8 V.
- What types of packages are available for the ADM691AN?
The ADM691AN is available in 16-pin DIP and TSSOP packages.
- What is the operating temperature range for the ADM691AN?
The operating temperature range is -40°C to 85°C.
- Does the ADM691AN support chip enable signals?
Yes, it provides onboard gating of chip enable signals.
- What are some common applications of the ADM691AN?
Common applications include microprocessor systems, computers, controllers, intelligent instruments, and automotive systems.
- Is the ADM691AN RoHS compliant?
Yes, the ADM691AN is lead-free and RoHS compliant.
