BD4948G-TR

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The Infineon Technologies BD4948G-TR is a Supervisors peripheral monitor integrated circuit (“PMIC”) designed to provide power management and monitor functions for microcontrollers, application processors, memory and other integrated circuits. The BD4948G-TR is a 4-Volt to 5.25-Volt powered Serial Peripheral Interface (SPI) compatible device that contains multiple general-purpose monitors, a supervisory circuitry and a reset output. The BD4948G-TR is designed to be an interface between a host processor and various circuits that require power management and monitoring.

TheBD4948G-TR provides active current monitoring, under-voltage (UV) /over-voltage (OV) sense, brown-out detect and power-on-reset (POR) functions. The part also includes a programmable timer (TIMER) which can be triggered by a digital input or an alternating current (AC) signal. It also provides integrated protection from brown-out and over-voltage conditions, as well as reset control logic for isolated systems.

The active current monitoring feature of the BD4948G-TR enables the system designer to monitor load current in order to detect potential over current issues. When overloaded or abnormal operation occurs, i.e., over-voltage, under-voltage and/or an overload, the device will reset the connected processor/IC. The protection threshold can be set by an external voltage applied to the sense pin.

The BD4948G-TR is also capable of providing a reset signal to the host processor/IC when various system events occur. These events include power up, brown-out, over-voltage and under-voltage conditions. The reset signal is triggered when a preset threshold is set by an adjustable external voltage applied to the UV/OV pins. The reset signal is also synchronised with an external oscillator.

The BD4948G-TR also comes with a programmable timer (TIMER) feature. This feature can be programmed to generate a signal based on a preconfigured time, and can be triggered by a digital input or an AC signal. The TIMER is used to generate a signal when system events, thus preventing unwanted reset signals from occurring. The TIMER can be configured to generate a signal from 1ms to 1.2s and is accurate to within ± 2%.

The BD4948G-TR further includes protection from brown-out and over-voltage conditions. This is implemented by using a weak pull-up or pull-down voltage applied to the reset pin, depending on the event that occurred. When a preset threshold is set, a interrupt is sent to the host processor to advise the system the new event and to reset accordingly. The reset signal is aligned with an external oscillator.

Ultimently, the BD4948G-TR is an ideal solution for system design engineers needing to integrate power management and monitoring functions into their design. The device provides a comprehensive set of features, such as active current monitoring, power-on reset, UV/OV sense, brown-out detect and programmable timer; in addition to protection for brown-out and over-voltage conditions. The power supply up to 5.25V and SPI compatibility allows for easy integration in existing systems. The part also comes with protection against unwanted reset signals, thus making this an excellent choice for designs needing power monitoring and management.

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