DS1233D-10/T&R

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The DS1233D-10/T&R device from Dallas Semiconductor is a combination supervisory circuit and Low Dropout Regulator (LDO). This device is commonly used in battery-powered microprocessor applications, providing both voltage monitoring and voltage regulation for the system. In this article, we will discuss the application fields and working principle of the DS1233D-10/T&R.

Application Fields

The DS1233D-10/T&R is designed to support 5V, 12V, and 24V versions of systems with a wide range of voltage compatibility. It has a repetition rate of 6Hz minimum and a frequency of 3Hz maximum, minimum start-up standby current of 1 uA. By monitoring the supply voltage and quickly detecting any activity that goes beyond its pre-programmed voltage thresholds, the DS1233D-10/T&R device can guard against system errors, prevent system resetting and reboot, and provide power resetting for the system sequentially on power up. In addition, it can provide current limiting and protect against open-circuit conditions.

The DS1233D-10/T&R is suitable for a wide range of applications including industrial, medical, telecommunication, automotive, and automotive body products, such as PDAs, digital cameras, PABXs, motor controllers and so on. In industrial and medical applications, the device can provide protection against power supply noise. In a telecommunication application, it can prevent system reboot by monitoring power supply over-voltages and under-voltages, while in automotive and automotive body product applications it can provide input error protection.

Working Principle

The DS1233D-10/T&R device is powered by three external resistors that configure an internal voltage reference at a voltage representing the minimum power supply voltage required for system reset. An integrated voltage comparator compares the voltage present at the input pin to the internal reference, producing an output status signal in either power good (PG) or reset (RST) logic states. The output signals can be detected, and the corresponding interrupt can be reported to the microprocessor, in order to recover the system from an unexpected condition.

The DS1233D-10/T&R device also contains a trim-potentiometer that can be adjusted to adjust the frequency of the comparator compared to the external supply voltage, synchronizing power-up and power-down sequences, and so, controlling the working timing of the system. When the voltage at the input pin drops below a preset value, the device generates an interrupt signal that can be connected to a system reset terminal. In addition, the device is provided with an adjustable current limit function which sets the amount of current that can be driven by the system.

Apart from these features, the DS1233D-10/T&R also features a voltage regulator with variable output voltage control that can regulate input voltages in excess of 180 V. It also has an on/off control and a standby function that releases the system from a low-power state when a predetermined voltage is reached. Moreover, the device is provided with an adjustable reset timer that allows a system to reset after a certain time interval.

In conclusion, the DS1233D-10/T&R is a sophisticated, feature-rich supervisory circuit and low dropout regulator that provides voltage monitoring and voltage regulation. It is suitable for a wide range of applications, including industrial, medical, telecommunication, automotive, and automotive body products. It offers a wide range of features, including voltage monitoring, adjustable current limit, voltage regulator, and adjustable reset timer, making it an ideal choice for battery-powered microprocessor applications.

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