APX809S05-26SA-7

The APX809S05-26SA-7 is a part of a family of precise voltage monitoring ICs (PMIC - Supervisors) designed to protect an embedded system using an I2C interface bus. This particular device has an ultra-low supply current and small package size. It provides protection against various faults, including over-voltage, under-voltage, power supply sequencing, power-on reset and over-temperature.

The APX809S05-26SA-7 is a typical linear voltage supervisor with power-on reset and active-high/active-low reset/power-good output. It monitors supply voltages of 3V to 5.5V, setting the power-on reset trip voltage at 3.63V, active-high reset/power-good trip voltage at 4.15V and active-low reset/power-good trip voltage at 4.65V. The device has an open-drain-output which is configured as a power-good signal, which warns the system when the voltage level falls below the trip point. It also has an external delay circuitry and a reset/power-good signal featuring a 3.3 ms delay for power-on and a 0.25 ms delay for device reset.

The APX809S05-26SA-7 provides a watchdog timer, which can be enabled to generate a system reset before the voltage detected falls below the active-high or active-low reset/power-good trip voltage. This technique provides additional protection against low voltage or power sequencing errors which can lead to system failure.

This device can also be used as a reset controller in a system-failure or overvoltage detection circuit. This feature is possible due to an internal supply current monitor, which will provide an output indicating when the supply current has become excessive. The device also has an internal comparator to set the trip voltage. This feature allows the device to be used to detect overvoltage conditions, providing a system reset when the voltage rises beyond the set threshold.

The APX809S05-26SA-7 is used in a variety of applications, such as motor controllers, portable electronic devices, communication systems, and switching power supplies. In handheld and embedded devices, it provides power-on reset, over-voltage, low-voltage and under-voltage protection.

The APX809S05-26SA-7 can be used as an ideal replacement for traditional microcontroller-based voltage supervisors. It requires few external components, making it simple to incorporate into a design. With a low quiescent current, low reset threshold and fast reset response time, the device provides reliable protection against power-supply sequencing, voltage over-voltage, voltage under-voltage, power-on reset and over-temperature faults.

In summary, the APX809S05-26SA-7 is a versatile and reliable voltage monitoring IC offering features such as power-on reset, active-high/active-low reset/power-good output, watchdog timer, supply current monitor and an internal comparator for overvoltage detection. Its low supply current, small package size and optional delays make it a great choice for higher-end embedded and mobile applications. Moreover, its wide voltage range, immunity to transients and sensing accuracy makes it a great addition to any system.