Diodes Incorporated APX803S00-29SR-7 Microprocessor Reset Circuit

The APX803S00-29SR-7 is a highly precise, low power voltage detector, designed by Diodes Incorporated to monitor the system voltage in microprocessor (µP), microcontroller (MCU), and digital systems. It is engineered to maintain system integrity by providing a reset signal to the host processor when the supply voltage drops below a predefined threshold, ensuring a proper restart and operation of the system upon power-up or during any undesired power dips.

This voltage detector is a crucial component for reliable system performance, especially in applications where consistent operation is critical, such as in portable devices, automotive systems, and industrial equipment. Its key features include a fixed threshold voltage of 2.93V, which provides a precise monitoring capability for 3V systems. The APX803S00-29SR-7 is designed to assert a reset signal whenever the V_CC drops below the minimum voltage threshold, keeping the signal active until the V_CC rises above the reset threshold, plus a minimum reset timeout period.

The device comes in a compact SOT-23 package, which makes it suitable for space-constrained applications. Its low power consumption is an advantage for battery-powered devices, helping to extend battery life by ensuring that the system is not unnecessarily powered when the voltage is insufficient for proper operation.

Other notable specifications of the APX803S00-29SR-7 include:

• Power supply glitch immunity to prevent false resets
• Low supply current of 17µA (typical) which is ideal for power-sensitive applications
• Temperature range from -40°C to +85°C, allowing operation in a wide range of environments
• Push-pull active-low reset output, which provides a direct interface to the reset pin of the processor without needing an external pull-up resistor

With its combination of features, the APX803S00-29SR-7 from Diodes Incorporated is an essential component for system stability and reliability, providing designers with a straightforward solution for voltage monitoring and system reset functionality.