DS1232SN+T&R

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PMIC (Power Management Integrated Circuit) solutions are designed to improve power supply efficiency and reliability. Supervisors are a type of PMIC solution that provide configuration settings and regulatory functions to protect against undesirable power fluctuations and improve power integrity. The Intersil DS1232SN+T&R is a microprocessor supervisory circuit (MCU) designed to simplify the task of configuring and monitoring system power-up reset, initialization, and power sequencing requirements.

Introduction to the DS1232SN+T&R

The DS1232SN+T&R is an 8 pin µP supervisory circuit with power-up and power-down reset protection and voltage detection capabilities. It provides built-in circuits to monitor Vcc, VIN, VDD, and PGOOD (power-good) voltages. Its advanced reset and power-failure flags allow for a highly integrated reset and power down reset solution. This device ensures that the onboard MCU properly initializes, regardless of whether power is applied directly to the circuit or through an external sensor.

Applications and Benefits

The DS1232SN+T&R is suited to provide reset protection and automatic power-failure detection in applications such as fan speed controllers, embedded camera systems, battery-powered products, industrial automation, uninterruptible power supplies and solar power systems. Its wide operating temperature range of -40°C to +125°C makes it suitable for a range of industrial applications.

The combination of reset protection and power-failure detection offers a range of benefits. Reset protection ensures that the system power of the MCU is maintained, even if the power is lost. Power-failure detection allows the system to detect when the power is low and initiate a shut-down procedure before any damage can be done. It also provides the system with voltage information to ensure the system remains in compliance with the chosen power regulator.

Working Principle

The DS1232SN+T&R has two main functions: reset protection and power-failure detection. The reset protection ensures that the system is properly powered, whereas power-failure detection helps to detect power fluctuations and initiate the necessary action before the system is damaged. The device also provides voltage detection functionality to monitor the Vcc, VDD, and VIN voltage levels and provide information to the host processor through an on-chip comparator.

When power is first applied to the system, the DS1232SN+T&R initiates a reset of the onboard MCU. This ensures that the MCU is properly initialized and all power-up sequencing requirements have been met. Once the MCU has booted, it can then be programmed to monitor the Vcc and VDD voltages. If either of these voltages drops below the programmed threshold, a reset is initiated. This allows the system to initiate a safe shutdown procedure and prevent any damage. The DS1232SN+T&R can also be programmed to monitor the off-board VIN voltage. If the VIN voltage drops below the programmed threshold, an on-chip signal is generated to warn the user.

The power-failure detection is based on an internal voltage reference that can be adjusted as needed. By monitoring the output of the on-chip comparator, the MCU can detect external power drops and initiate a safe shutdown procedure. The on-chip comparator also allows for the monitoring of the VIN voltage. If the VIN voltage drops below the programmed threshold, an on-chip signal is generated to warn the user.

Conclusion

The DS1232SN+T&R is an 8-pin microprocessor supervisory circuit that provides reset protection and automatic power-failure detection for applications such as fan speed controllers, embedded camera systems, battery-powered products, industrial automation, uninterruptible power supplies and solar power systems. It features an adjustable voltage reference and advanced reset flags to ensure that the MCU can properly initialize. It also provides built-in circuits to monitor Vcc, VIN, VDD, and PGOOD voltages. By monitoring the output of the on-chip comparator, the MCU can detect external power drops and initiate a safe shutdown procedure. The combination of reset protection and power-failure detection offers a range of benefits and makes the DS1232SN+T&R a valuable addition to any power management application.

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