Overview
The ADM811RART-REEL7, produced by Analog Devices Inc., is a microprocessor supervisory circuit designed for reliable voltage monitoring in various applications. This device is part of the ADM811/ADM812 series, which are suitable for monitoring six different voltages, allowing for a 5% or 10% degradation of standard PSU voltages before a reset occurs. The ADM811 provides an active low reset output, while the ADM812 provides an active high reset output. These devices ensure stable operation of microprocessors by providing power-on reset signals and protecting against power supply brownouts or interruptions.
Key Specifications
| Parameter | Rating/Value |
|---|---|
| Terminal Voltage (With Respect to Ground) | VCC: −0.3 V to +6 V, All Other Inputs: −0.3 V to VCC + 0.3 V |
| Input Current | VCC: 20 mA, MR: 20 mA |
| Output Current | RESET: 20 mA |
| Power Dissipation (TA = 70°C) | 200 mW (Derate by 4 mW/°C Above 70°C) |
| Thermal Impedance | 330°C/W |
| Operating Temperature Range | −40°C to +85°C |
| Storage Temperature Range | −65°C to +160°C |
| Lead Temperature (Soldering, 10 sec) | 300°C |
| ESD Rating | 3 kV |
| Manual Reset Input | Active low, debounced, ignores pulses of 100 ns or less, accepts pulses greater than 10 μs |
| Reset Output | Active low (ADM811), Active high (ADM812), remains high/low for 240 ms after VCC rises above reset threshold |
Key Features
- Voltage Monitoring: Monitors six different voltages (2.5 V, 3 V, 3.3 V, and 5 V) with 5% or 10% degradation tolerance before reset.
- Manual Reset: Features an active low debounced manual reset input that ignores input pulses of 100 ns or less and accepts pulses greater than 10 μs.
- Reset Output: Provides either an active low (ADM811) or active high (ADM812) reset output that remains valid for 240 ms after the supply voltage recovers.
- Power-On Reset: Ensures stable operation of the microprocessor by providing a power-on reset signal and protecting against power supply brownouts or interruptions.
- Glitch Immunity: Designed to operate in noisy environments with glitch immunity to prevent spurious resets.
Applications
- Microprocessor Systems: Ideal for supervising microprocessors in various systems.
- Controllers and Intelligent Instruments: Suitable for use in control systems and intelligent instruments.
- Automotive Systems: Used in automotive applications for reliable voltage monitoring.
- Safety Systems: Employed in safety-critical systems to ensure stable operation.
- Portable Instruments: Applicable in portable instruments where reliable power monitoring is essential.
Q & A
- What is the primary function of the ADM811RART-REEL7?
The primary function is to monitor supply voltages and provide a reset signal to the microprocessor in case of voltage degradation or power supply interruptions.
- What are the monitored voltage levels for the ADM811/ADM812?
The devices monitor 2.5 V, 3 V, 3.3 V, and 5 V supply voltage levels.
- What is the significance of the manual reset input?
The manual reset input is an active low debounced input that ignores short pulses and ensures reliable reset operation even in noisy environments.
- How long does the reset output remain active after the supply voltage recovers?
The reset output remains active for 240 ms after the supply voltage recovers.
- What is the operating temperature range of the ADM811RART-REEL7?
The operating temperature range is −40°C to +85°C.
- What is the ESD rating of the ADM811RART-REEL7?
The ESD rating is 3 kV.
- Can the ADM811RART-REEL7 be used in automotive systems?
Yes, it is suitable for use in automotive systems for reliable voltage monitoring.
- How does the device ensure stable operation during power-up?
The device ensures stable operation by providing a power-on reset signal and allowing time for both the power supply and the microprocessor to stabilize after power-up.
- What is the thermal impedance of the ADM811RART-REEL7?
The thermal impedance is 330°C/W.
- What type of reset output does the ADM811 provide?
The ADM811 provides an active low reset output.
