Overview
The ADM802LARNZ-REEL, produced by Analog Devices Inc., is a supervisory circuit designed to provide comprehensive power supply monitoring and battery control functions in microprocessor systems. This component is part of the ADM690A/ADM692A/ADM802L/M/ADM805L/M family, which offers a single-chip solution for various power management needs. It features precision supply voltage monitoring, reset assertion down to 1 V, and a watchdog timer, making it an essential component for ensuring the reliability and stability of microprocessor-based systems.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Reset Threshold Voltage | 4.55 | 4.7 | - | V |
| Reset Timeout Delay | 140 | 200 | 280 | ms |
| Watchdog Timeout Period | 1.0 | 1.6 | 2.25 | s |
| WDI Input Pulse Width | - | - | 50 | ns |
| WDI Input Threshold (Logic Low) | - | - | 0.8 | V |
| WDI Input Threshold (Logic High) | - | - | 3.5 | V |
| Quiescent Supply Current | - | 100 | - | µA |
| Operating Temperature | -40 | - | 85 | °C |
| Max Power Dissipation | - | - | 500 | mW |
Key Features
- Precision supply voltage monitoring with a reset threshold voltage of 4.65 V for the ADM802L.
- Reset assertion down to 1 V VCC, ensuring the reset output remains operational even at low supply voltages.
- A watchdog timer with a timeout period of 1.6 seconds to detect and reset the system if the watchdog input is not toggled within the specified time.
- Automatic battery backup switching for CMOS RAM, CMOS microprocessors, or other low-power devices.
- Power fail detection with a 1.25 V threshold detector for monitoring power supply failures or low battery conditions.
- Low quiescent supply current of 100 µA, contributing to low power consumption.
- Space-saving 8-pin SOIC package, offering a compact solution for various applications.
Applications
The ADM802LARNZ-REEL is designed for use in a variety of microprocessor-based systems, including:
- Microprocessor systems and computers.
- Controllers and intelligent instruments.
- Systems requiring power-on reset, battery backup, and watchdog timer functions.
Q & A
- What is the primary function of the ADM802LARNZ-REEL? The primary function is to provide power supply monitoring and battery control in microprocessor systems.
- What is the reset threshold voltage for the ADM802L? The reset threshold voltage is 4.65 V.
- How long does the watchdog timer timeout period last? The watchdog timer timeout period is 1.6 seconds.
- What is the quiescent supply current of the ADM802L? The quiescent supply current is 100 µA.
- What types of packages are available for the ADM802L? The component is available in 8-pin SOIC and DIP packages.
- What is the operating temperature range for the ADM802L? The operating temperature range is from -40°C to 85°C.
- What is the maximum power dissipation of the ADM802L? The maximum power dissipation is 500 mW.
- Does the ADM802L support battery backup switching? Yes, it supports automatic battery backup switching for CMOS RAM and microprocessors.
- Is the reset output operational at low VCC levels? Yes, the reset output remains operational with VCC as low as 1 V.
- What is the purpose of the power fail detector in the ADM802L? The power fail detector monitors for power supply failures or low battery conditions with a 1.25 V threshold detector).
