ISL6536IBZ-T

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The ISL6536IBZ-T is a microprocessor reset and voltage supervisor that acts as a companion integrated circuit (IC) for a microcontroller. It provides a reset output and a logic output that indicates the presence of an off-chip power supply supply. Reset circuits are used in all kinds of microcontroller systems. With the ISL6536IBZ-T, this reset functionality is integrated into one IC, offering a cost-effective solution.

Application Field

At a high level, the ISL6536IBZ-T works by monitoring multiple off-chip power supply voltages and providing reset and logic outputs. This makes it useful for a variety of microcontroller applications including embedded systems, industrial controllers, communication equipment, and automotive systems. It can be used for protection in any application that relies on a power supply or can be used as a general reset circuit to ensure proper system start-up. Furthermore, due to its low operating current and wide operating temperature range, the ISL6536IBZ-T can be used in battery operated handheld devices.

Working Principle

The ISL6536IBZ-T has two active inputs that can be used to monitor the voltages of two off-chip power supply channels. It features two adjustable reset outputs and one logic output that is triggered when the voltage levels of the two input channels exceed a user-defined threshold. The two reset output pins are open-drain outputs, which means that the IC does not actively drive the reset pins but instead \'sinks\' the output to ground (GND). This can be useful for microcontroller protection, as an open-drain output allows a reset signal to be connected to multiple circuits from a single pin.

The trigger levels of the reset outputs are adjustable by using external resistors. A RESET_LOW pin and a RESET_HIGH pin are used to adjust the reset trigger levels. The trigger levels of the logic pin are also adjustable, with the voltage set by the user. The logic output is asserted when both of the inputs are above their trigger levels while the reset outputs will be asserted as soon as one of the inputs goes above its configured threshold.

The ISL6536IBZ-T also contains a watchdog timer which can be used to monitor the microcontroller’s activity. If the microcontroller does not toggle a signal at a specified interval, the reset outputs will be asserted after a programmable timeout. This ensures that the system will be reset if it becomes stuck or freezes, preventing damage that may be caused by prolonged system inactivity.

The ISL6536IBZ-T is a simple and effective way to keep systems running smoothly by monitoring off-chip supply voltages, providing reset and logic signals, and resetting the system in the case of inactivity. With its wide operating temperature range and low operating current, it is suitable for use in a variety of applications, making it a cost-effective choice for those seeking a simple integrated circuit to provide reset and logic outputs.

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