BU4332F-TR

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The BU4332F-TR is one of the many power monitoring Integrated Circuit (PMIC) solutions from Tokyo based semiconductor provider Renesas. This family of PMIC solutions are distinguished by the Supervisors product line which helps protect against mal-operation or system malfunctions by setting thresholds for events.

A supervisor usually monitors power conditions and complex peripheral states. This can help prevent system malfunctions that result from improper resource utilization. The BU4332F-TR combines multiple supervisors such as a Reset/Power-On Reset (POR), a watchdog timer, and a voltage detector into one low power solution.

The primary application field for the BU4332F-TR is specifically in automotive systems. Automakers depend on reliable mission critical systems to ensure the safe operation of their vehicles. The BU4332F-TR supervisor helps provide the necessary protection by monitoring and detecting various power conditions.

The BU4332F-TR working principle starts with a power monitor circuit. This monitors the supply voltage of the system, which must be within a specified range. If it drops below the specified lower threshold, it is termed under voltage, and an abort signal is sent to the system. Similarly, if the voltage exceeds the higher specified threshold, a power-on reset (POR) signal is triggered.

The power monitor circuit is connected to a watchdog timer. This triggers at specific intervals and helps detect system stuck states and programming errors. When the timer goes off, it sends a reset signal and restarts the system. The BU4332F-TR also has a built-in operating temperature monitor. This helps detect potential overheating caused by too much current or overloading.

Another feature of the BU4332F-TR is the voltage detector feature. This helps detect various voltage conditions such as high voltage and low voltage. A voltage detector pulse can be set to detect these conditions at any point within the system. If a low voltage is detected, then an abort signal is sent, while a high voltage detected will cause an immediate reset.

The BU4332F-TR also features an auto-recovery circuit. This helps detect and recover malfunctions such as unexpected drops in power and system hangs. The auto-recovery circuit slowly boosts the voltage from a minimum level until the threshold voltage is reached. This helps avoid large or sudden power drops or surges.

By combining multiple safety functions such as a reset/power-on reset, a watchdog timer, a voltage detector, and a temperature monitor, the BU4332F-TR supervisor helps ensure the stable operation of automotive systems. The BU4332F-TR is an example of a power monitoring IC that is designed specifically to meet the stringent requirements of automotive applications.

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