DS1233MS-55+T&R

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The DS1233MS-55+T&R (MS-55) is a low-cost voltage supervisor device designed to monitor power supplies in microprocessor systems. It has two thresholds, an internal reset delay, and a manual reset input. This supervisor is suitable for use in systems powered by battery or AC power, including portable computers, embedded controllers, and low-power battery-powered systems. The MS-55 provides a low reset threshold for detection of VCC undervoltage, and a higher threshold for power-good monitoring. In addition, the MS-55 provides small reset setup and hold times to allow for the quick resetting of other system peripherals.

Applications

The DS1233MS-55+T&R is used in a variety of applications, including microprocessors, mobile phones, modems, networks, industrial controllers, and other embedded systems. It provides power-on reset (POR) functions, supply voltage monitoring, and system reset timing.

The primary function of the DS1233MS-55+T&R is to provide an early warning in the event of a supply voltage failure or excess. It monitors the supply voltage during power-on and power-off conditions, and has internal mapping between the monitored supply voltage and system reset. When the supply voltage drops below or rises above the preset voltage threshold, the device issues a reset signal to the system.

In addition, the DS1233MS-55+T&R also provides protection from power supply transients and brownouts by generating a system reset signal when a voltage failure is detected. The reset signal can be used to reset the system and prevent damage from occurring due to the voltage failure.

Working Principle

The DS1233MS-55+T&R is an integrated voltage-monitoring circuit that combines a low-voltage detector and a high-voltage detector. The low-voltage detector provides an early warning of supply undervoltage, while the high-voltage detector provides a power-up circuit. The device also includes a manual reset (MR) input, a reset delay circuit, and a reset output signal.

The low threshold of the detector is preset at the factory and cannot be adjusted. This threshold determines the voltage at which the device will respond to an undervoltage condition. Typically, the low-threshold voltage is about 6% lower than the nominal operating voltage of the device, and it will cause the device to assert a reset signal earlier in the event of an undervoltage condition.

The high threshold of the detector is adjustable and can be set to a level that provides an adequate margin from the nominal operating voltage. This margin allows the device to issue a reset signal when the supply voltage rises above the preset threshold and helps to protect the system from overvoltage conditions.

For manual reset operations, the MR input is connected to logic-level active-low signal. When the signal is asserted, the device will immediately reset the system and initiate a reset sequence. The MR input is active-low, so the signal must be held low for a minimum of 1 millisecond in order to generate a reset signal.

The reset delay circuit is used to provide a fixed reset delay, which is typically set to 10 milliseconds. This reset delay allows the device to reset the system after an undervoltage or overvoltage event and allows the other system peripherals to reset and initialize properly.

Once the reset threshold is met and the reset delay has expired, the reset output signal is issued, which can be used to reset the system and any other peripherals. This reset signal is active-low and will remain active until the preset reset delay has expired and the supply voltages return to normal.

Conclusion

The DS1233MS-55+T&R is a low-cost voltage supervisor device designed to provide reliable power supply monitoring, power-on reset, and reset timing functions for microprocessor-based systems. It has adjustable high and low voltage thresholds and includes a reset delay circuit to allow other system peripherals to reset and initialize properly. The DS1233MS-55+T&R is suitable for use in a variety of applications, including mobile phones, networks, industrial controllers, and other embedded systems.

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