DS1233MS-5/T&R

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PMIC (Power Management ICs) supervisors are an important type of integrated circuit designed to regulate and manage the power supply of digital and analog devices. The DS1233MS-5/T&R is a supervisor chip from Maxim Integrated Products Inc. It is specially designed to provide robust voltage monitoring and system reset features for microcontrollers, DSPs, and communication systems. This article will discuss the application field and working principle of the DS1233MS-5/T&R supervisor.

Applications

The DS1233MS-5/T&R is a cost-effective watchdog supervisor IC which can be used in a wide range of applications, including microcontrollers, DSPs and communication systems. The chip has the ability to detect both under-voltage and over-voltage power supply conditions, providing the system with an adjustable reset timeout and reset enables. The reset enable allows the system to reset automatically if an event occurs, such as an excessive voltage drop, or an excessive temperature rise. It also prevents system crash by monitoring the voltage level of the supply, and ensures optimal performance.

In addition, the chip can provide a system reset of up to 100ms in order to help the system recover from unexpected power faults and over-voltage conditions. The reset circuit on the DS1233MS-5/T&R supervisor has an adjustable delay range from 0.10s to 4.09s, allowing for the adjustment of both the reset timeout and the reset enable time. With its integrated low-power CMOS technology, the chip consumes only 6µA when active, lowering system power consumption.

Working Principle

The DS1233MS-5/T&R supervisor operates according to an external watchdog timer which monitors the system for predetermined periods of time. It has two operational functions, reset enable and reset timeout. The reset enable monitors the voltage level of the power supply, while the reset timeout specifies how long the system should wait before resetting the device.

Under normal operating conditions, the reset enable checks the voltage level of the power supply and, if it is within the low VCCT or high VCCT range, it will activate the reset circuit. If the voltage level falls out of this range, the reset enable feature is disabled, allowing the reset timeout to take over. This reset timeout feature will apply an adjustable delay to the restart of the system, providing an adjustable period for the system to recover from any potential fault conditions.

When the system detects a fault, such as a power failure, the reset timeout will remain active until the fault condition has been rectified. Once this is done, the system can be restarted by the reset enable circuit. The reset enable can be adjusted depending on the user’s needs, and it is also possible to completely disable this feature if desired. In addition, the chip also contains an over-voltage reset circuit which can trigger a reset if the voltage of the power supply exceeds the acceptable range.

The DS1233MS-5/T&R supervisor chip is a reliable and cost-effective device for regulating and managing power supplies in microcontrollers, DSPs and communication systems. Its main features include a reset enable and reset timeout feature, as well as an over-voltage reset circuit, making it ideal for applications which need to recover from power faults quickly and efficiently. Additionally, its low-power consumption and adjustable timeouts allow for more efficient system performance, providing for a more reliable operation.

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