NCP304HSQ22T1

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The NCP304HSQ22T1 is one of a series of Positive Voltage Supervisors (PVSs) that support low-voltage systems and provide hardware-controlled reset assertion and Power-Good (PG) monitoring functions. It is a micropower, single-channel PVS device with overvoltage and undervoltage lockout (UVLO) capability. This device can monitor its high-side power supply voltage and provides a reset signal to the microprocessor or microcontroller. It is suitable for high-side supply line reset applications include battery-powered equipment, single chip reset generator and current limit or power-good detector.

Features

The NCP304HSQ22T1 has many features, including an input voltage range of 3V to 15V and a broad range of reset delay times. Its generous output current (10mA) is sufficient to drive multiple loads while its ultra-low power consumption helps to extend battery life. The integrated reset circuit provides a reset pulse to the microcontroller when the supply voltage falls below the reset trip point. The reset signal is valid for at least 20ms, enabling the reset signal to be safely captured by the microcontroller.

Applications

The NCP304HSQ22T1 is ideal for use in automotive, industrial, medical and consumer applications where a reset signal must be generated. Examples include electronic control equipment, battery-powered instrumentation and vehicle diagnostic systems. It is also used for microprocessor and microcontroller power supply monitoring and reset generation in electro-mechanical applications.

Working Principle

The NCP304HSQ22T1 Positive Voltage Supervisor functions on a simple principle. When the supply voltage falls below the Reset Trip Point (Vth), the reset signal is activated. The reset pulse remains in the active state until the supply voltage crosses the reset threshold (Vth). The combination of the reset plus and reset minus pins on the device enable the reset output to be directly driven or optically isolated through the use of a transformer.

The device has an UVLO function which sets the reset trip point either higher or lower depending on which UVLO pin is used. The device also features a Power Good Monitoring (PGM) output which is asserted to a low state when the measured voltage exceeds the reset trip point. This feature can be used to extend the reset signal duration and provide a warning to the user when the voltage at the PGM node is outside a specified range.

Conclusion

The NCP304HSQ22T1 Positive Voltage Supervisor is a micropower, single-channel PVS device designed to monitor high-side power supplies and generate reset signals. It has many features including a wide input voltage range, low power consumption and a built-in reset circuit. The device is suitable for applications such as automotive, industrial, medical and consumer applications where a reset signal must be generated. It is also used for microprocessor and microcontroller power supply monitoring and reset generation in electro-mechanical applications.

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