Overview
The ADM1232ARMZ-REEL7, produced by Analog Devices Inc., is a microprocessor supervisory circuit designed to monitor and protect microprocessors in various applications. This device is pin-compatible with the MAX1232, DS1232LP, and DS1232, making it a versatile option for system designers. The ADM1232 can monitor the microprocessor supply voltage, detect if the microprocessor has locked up, and respond to external interrupts. It is available in several package options, including 8-lead MSOP (RM-8), 8-lead PDIP (N-8), 16-lead wide SOIC (RW-16), and 8-lead narrow SOIC (R-8).
Key Specifications
| Parameter | Description |
|---|---|
| VCC | Maximum supply voltage: 5.5 V |
| Operating Temperature | −40°C to +85°C |
| Supply Current | Maximum: 500 µA |
| Power Dissipation | Maximum: 900 mW |
| Tolerance Input | Selects 5% or 10% VCC tolerance level |
| Reset Output | Active high logic output, open-drain MOSFET for RESET |
| Time Delay Set (TD) | Selects the maximum time for STROBE input inactivity before generating a RESET pulse |
| Push-Button Reset (PB RESET) | Debounced input, ignores pulses < 1 ms, responds to pulses > 20 ms |
| STROBE Input | Monitors high-to-low transitions to detect microprocessor lock-up |
Key Features
- Monitors microprocessor supply voltage and detects voltage drops below specified tolerance levels (5% or 10% of VCC).
- Detects microprocessor lock-up through the STROBE input and generates a RESET pulse if the STROBE input remains inactive for a specified time.
- Includes a push-button reset input (PB RESET) that is debounced to ignore short pulses and ensure reliable reset operation.
- Provides both active high logic output (RESET) and open-drain MOSFET output (RESET) for flexible system integration.
- Available in multiple package options to suit various design requirements.
Applications
- Intelligent instruments: The ADM1232 is suitable for use in intelligent instruments that require robust microprocessor monitoring and reset capabilities.
- Automotive systems: Its ability to operate over a wide temperature range and its robust monitoring features make it ideal for automotive applications.
- Industrial control systems: The device can be used in industrial control systems where reliable microprocessor operation is critical.
Q & A
- What is the primary function of the ADM1232? The primary function of the ADM1232 is to monitor the microprocessor supply voltage, detect if the microprocessor has locked up, and respond to external interrupts.
- What are the available package options for the ADM1232? The ADM1232 is available in 8-lead MSOP (RM-8), 8-lead PDIP (N-8), 16-lead wide SOIC (RW-16), and 8-lead narrow SOIC (R-8) packages.
- How does the TOLERANCE input work? The TOLERANCE input determines the percentage decrease in supply voltage (5% or 10%) before a RESET is asserted. Connecting TOLERANCE to GND selects a 5% tolerance, and connecting it to VCC selects a 10% tolerance.
- What is the purpose of the PB RESET input? The PB RESET input is a debounced push-button reset that ignores pulses less than 1 ms and responds to pulses greater than 20 ms.
- What is the role of the STROBE input? The STROBE input monitors high-to-low transitions to detect if the microprocessor has locked up and generates a RESET pulse if the input remains inactive for a specified time.
- What are the reset output options? The ADM1232 provides both an active high logic output (RESET) and an open-drain MOSFET output (RESET).
- What is the maximum operating temperature of the ADM1232? The maximum operating temperature of the ADM1232 is +85°C.
- What is the maximum supply current of the ADM1232? The maximum supply current of the ADM1232 is 500 µA.
- What are some typical applications of the ADM1232? Typical applications include intelligent instruments, automotive systems, and industrial control systems.
- How does the Time Delay Set (TD) input function? The TD input allows the user to select the maximum time for the STROBE input to remain inactive before generating a RESET pulse.
