Overview
The ADM823SYRJZ-R7 is a supervisory circuit produced by Analog Devices Inc., designed to monitor and manage the operation of microprocessors and other digital systems. This device is part of the ADM823/ADM824/ADM825 family and is known for its robust watchdog timer and manual reset capabilities. It ensures that the system operates within specified voltage and timing parameters, providing a reliable reset mechanism in case of system failures or malfunctions.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Supply Voltage (VCC) | 3 | - | 3.6 | V | - |
| Reset Threshold Voltage | - | - | 2.93 | V | - |
| Watchdog Timeout Period | 1.12 | 1.6 | 2.40 | sec | - |
| WDI Pulse Width | - | - | 50 ns | - | VIL = 0.4 V, VIH = 0.8 × VCC |
| WDI Input Threshold (VIL) | 0.3 × VCC | 0.7 × VCC | - | V | - |
| WDI Input Current | -20 | 120-160 | -15 | µA | VWDI = VCC, time average; VWDI = 0 V, time average |
| MR Input Threshold | 0.3 × VCC | 0.7 × VCC | - | V | - |
| MR Input Pulse Width | - | - | 1 µs | - | - |
| Operating Temperature Range | -40 | - | 125 | °C | - |
| Storage Temperature Range | -65 | - | 150 | °C | - |
| Package Type | - | - | 5-Lead SOT-23 | - | - |
Key Features
- Watchdog Timer: The device features a watchdog timer that monitors microprocessor activity. It requires the microprocessor to toggle the WDI pin within a specified timeout period to avoid a reset.
- Manual Reset: A manual reset input (MR) allows for external reset via a push-button switch. The input includes debounce circuitry and noise immunity.
- Reset Output: Provides a reset output that can be configured to source or sink current, ensuring compatibility with various system requirements.
- Voltage Monitoring: Monitors the supply voltage and generates a reset if the voltage falls below the specified threshold.
- Temperature Range: Operates over a wide temperature range from -40°C to +125°C, making it suitable for various environmental conditions.
Applications
The ADM823SYRJZ-R7 is suitable for a variety of applications where reliable system monitoring and reset capabilities are crucial. These include:
- Embedded Systems: Microcontroller-based systems that require robust watchdog and reset mechanisms.
- Industrial Control Systems: Systems that need to ensure continuous operation and quick recovery from faults.
- Automotive Electronics: Automotive systems that demand high reliability and fault tolerance.
- Medical Devices: Critical medical equipment that requires precise voltage monitoring and reset functions.
Q & A
- What is the primary function of the ADM823SYRJZ-R7?
The primary function is to monitor the supply voltage and microprocessor activity, generating a reset if the system fails to operate within specified parameters. - What is the watchdog timeout period for the ADM823SYRJZ-R7?
The watchdog timeout period ranges from 1.12 to 2.40 seconds. - How does the manual reset input work?
The manual reset input (MR) allows for an external reset via a push-button switch, with integrated debounce circuitry and noise immunity. - What is the operating temperature range of the ADM823SYRJZ-R7?
The device operates over a temperature range from -40°C to +125°C. - What type of package does the ADM823SYRJZ-R7 come in?
The device comes in a 5-Lead SOT-23 package. - Is the ADM823SYRJZ-R7 RoHS compliant?
Yes, the ADM823SYRJZ-R7 is RoHS compliant. - What is the supply voltage range for the ADM823SYRJZ-R7?
The supply voltage range is from 3V to 3.6V. - How does the reset output work?
The reset output can source or sink current, depending on the system requirements. - What kind of noise immunity does the MR input have?
The MR input includes debounce circuitry and ignores fast, negative-going transients of up to 100 ns. - Can the ADM823SYRJZ-R7 be used in automotive applications?
Yes, the device is suitable for automotive electronics due to its high reliability and fault tolerance.
