TPS3705-33DGN

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PMIC (Power Management Integrated Circuit) Supervisors are electronic devices that regulate and control power supply levels and signals from a power source. The TPS3705-33DGN is a member of the TPS370x family of PMIC Supervisors and is used to manage and monitor power signals, primarily in embedded systems. In this article, we will discuss the application field and working principle of the TPS3705-33DGN.

Application Field

The TPS3705-33DGN is a single chip system supervisor used to provide voltage monitoring, temperature sensing and error flagging to protect critical system components in embedded systems. It is suitable for power supply sequences in embedded system applications such as set-top boxes, cellular phones and networking equipment. The device includes an integrated voltage monitor, voltage level detector, temperature sensor and error flag output features all on a single chip. It is also designed to support high-end embedded systems with multiple power rails, advanced power management control and precision monitoring.

Working Principle

The TPS3705-33DGN uses a simple voltage monitor circuit that uses a pair of comparators to compare an external reference voltage against the monitored VDD supply. The monitored voltage is applied to one of the comparator inputs and the reference voltage is applied to the other input. When the monitored voltage is below the reference voltage, a low level is output. The TPS3705-33DGN also includes a detector circuit that uses a comparator to check whether or not the monitored voltage level is within a predetermined range specified by two voltage thresholds. The device will issue an active-low flag signal whenever the monitored voltage falls outside of the defined thresholds.

The device is also equipped with both temperature sensing and error flag outputs. The temperature sensor output is used to monitor system temperature and the error flag output will immediately flag whenever power anomalies occur. Both outputs can be connected to external monitoring hardware such as microprocessors or analog/digital controllers.

The TPS3705-33DGN can also be configured to operate as a power-on reset circuit, which is used for controlling the power-up sequence of devices. The device can be programmed to generate a reset signal when the voltage level reaches a predetermined threshold.

Key Features

The key features of the TPS3705-33DGN are as follows:

• Integrated voltage monitor, voltage level detector and temperature sensor.
• Programmable voltage thresholds, hysteresis and reset delay.
• Programmable reset outputs and error flag outputs.
• Supports power supply sequences in embedded systems.
• Robust and reliable.

Conclusion

The TPS3705-33DGN is a single chip system supervisor with integrated voltage monitoring, voltage level detection, temperature sensing and error flag outputs. It is designed to support high-end embedded systems with multiple power rails, advanced power management control and precision monitoring and is suitable for use in embedded system applications such as set-top boxes, cellular phones and networking equipment.

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