BD87A28FVM-TR Integrated Circuits (ICs)

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PMIC - Supervisors are electronic devices that are used to monitor, detect and protect power-saving systems from unexpected faults. The BD87A28FVM-TR is a great example of such a device.

The BD87A28FVM-TR is a two-channel, voltage supervisory IC that provides microprocessor reset and includes an integrated voltage detector, p-channel power switch, watchdog timer, and reset time delay circuit. It is the ideal solution for overvoltage, brown-outs and supply rail monitoring in applications that require low current consumption, low quiescent current, and low input leakage current. The BD87A28FVM-TR is available in 14-pin Super Thin ThinQFN packages and is characterized for operation over a wide voltage range: 1.6V to 5.5V.

The BD87A28FVM-TR is commonly used in applications such as Automotive, Industrial, Portable Devices, Home & Building Automation, and Low-Voltage Applications. The main goal when using this IC is to protect the core circuitry from overvoltage, undervoltage, overcurrent, and transient overvoltage conditions. This protection is important for maintaining the integrity of the equipment and keeps the performance within the intended specifications.

The BD87A28FVM-TR has two supervisor channels, one with an internal voltage detector, and the other with an external reference voltage. The internal voltage detector can detect voltages between 0.9V and 2.6V with a fixed detection accuracy of 8%. The external reference voltage can detect voltages between 0.6V and 5.4V with a variable detection accuracy of as low as 0.5%.

When voltage is detected within a programmed threshold, the BD87A28FVM-TR will send a reset output signal to the microprocessor. This reset signal is intended to power down the core circuitry and save energy from further consumption. The reset output signal is active HIGH, with a pulse width of 32kHz and can be used to trigger an external power supply such as a linear regulator. The reset output signal is clamped to the VCC for an active-LOW open-drain version, allowing the reset signal to be routed over long distances.

The BD87A28FVM-TR also boasts an integrated watchdog timer. The watchdog timer is an independent oscillator that is intended to detect unexpected faults or failures of the microprocessor. When the watchdog timer times out, it will send a signal to the microprocessor to reset the system. The time out period can be programmed using an external resistor-capacitor (RC) network, offering the flexibility of varying the timeout periods depending on the application. The only restriction is that the time out period must be between 1ms and 8s.

The BD87A28FVM-TR also allows for an adjustable reset time delay circuit. This feature can be used to eliminate false reset signals during power-up events. The reset time delay circuit also allows for an adjustable reset allowance time, which can be used to extend the system run time in applications with heavy power transient events such as automobile start-up.

The BD87A28FVM-TR is a versatile power monitoring IC, offering protection from unexpected voltage, current and power events, as well as an integrated watchdog timer and reset time delay circuit. It is a great choice for low power applications that require high accuracy voltage detection. With its combination of features and reliable performance, the BD87A28FVM-TR is the perfect choice for applications that need power monitoring and safeguarding.

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