Overview
The ADM697ANZ, produced by Analog Devices Inc., is a microprocessor supervisory circuit that provides comprehensive single-chip solutions for power supply monitoring and battery control functions in microprocessor systems. This device is part of the ADM696/ADM697 family and is designed to ensure reliable operation of microprocessors by monitoring power supply conditions, managing battery backup, and providing watchdog timer functionality.
Key Specifications
| Parameter | Min | Typ | Max | Unit | 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 (Battery Backup Mode) | VCC - 0.05 | VCC - 0.025 | VCC - 0.5 | V | IOUT = 1 mA, IOUT ≤ 100 mA |
| Supply Current (Excludes IOUT) | 1 | 1.95 | mA | IOUT = 100 mA | |
| Reset Time Delay | 200 ms | Adjustable | |||
| Watchdog Timeout | 100 ms | 1.6 s, Adjustable |
Key Features
- Power-On Reset output during power-up, power-down, and brownout conditions, with the reset output remaining operational with VCC as low as 1 V.
- A reset pulse if the optional watchdog timer has not been toggled within a specified time.
- Separate watchdog time-out and low line status outputs.
- Adjustable reset and watchdog timeout periods.
- A 1.3 V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than VCC.
- Battery backup switching for CMOS RAM, CMOS microprocessor, or other low power logic.
- Write protection of CMOS RAM or EEPROM to ensure data integrity during invalid VCC levels.
- Fast onboard gating of chip enable signals with a propagation delay of 5 ns.
Applications
- Microprocessor systems
- Computers
- Controllers
- Intelligent instruments
- Automotive systems
- Critical power monitoring systems
Q & A
- What is the primary function of the ADM697ANZ? The primary function is to provide power supply monitoring and battery control functions in microprocessor systems.
- What is the operating voltage range for VCC? The operating voltage range for VCC is 3.0 V to 5.5 V.
- How does the watchdog timer function? The watchdog timer generates a reset pulse if it has not been toggled within a specified time.
- What is the purpose of the battery backup switching feature? The battery backup switching feature is used to backup CMOS RAM, CMOS microprocessors, or other low power logic.
- How does the chip enable gating work? The chip enable gating ensures data integrity by preventing write operations when VCC is at an invalid level, with a propagation delay of 5 ns.
- What is the minimum VCC level at which the reset output remains operational? The reset output remains operational with VCC as low as 1 V.
- Can the reset and watchdog timeout periods be adjusted? Yes, the reset and watchdog timeout periods are adjustable.
- What is the threshold voltage for the power fail warning detector? The threshold voltage for the power fail warning detector is 1.3 V.
- In what packages is the ADM697ANZ available? The ADM697ANZ is available in 16-pin DIP and small outline packages.
- What is the supply current of the ADM697ANZ excluding IOUT? The supply current excluding IOUT is typically 1.95 mA.
