TL7709ACDR

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PMIC (Power Management ICs) are integrated circuits used in the power supply and management of electrical and electronic devices. Supervisors serve to protect the power distribution infrastructure by monitoring the status of various elements and providing notification of fault conditions (fuse failure, power losses, etc). Such supervision can prevent electrical fires or power outages. In this article, we take a look at the TL7709ACDR application field and working principle.

The TL7709ACDR is a dual supervisor IC. It is an active-low open drain reset generator, designed for use in microprocessor and microcontroller systems for power supplies up to + 5.5V. It is housed in an 8-pin SOIC package, sustain a thermal shutdown and overcurrent protection (OCP). The device provides both a watchdog timer, with a selectable timeout period of 1.6ms, 3.2ms, 6.4ms, and 12.8s, and a push-pull RESET output.

Given the nature of its function, the TL7709ACDR is designed for use in protection systems such as embedded systems and industrial automation machines. Its features make it an ideal solution for systems that require resetting or rebooting in the event of a fault condition. Examples of this include computer systems with high loads or extended automation machines, where resetting or rebooting the system is required in order to maintain stability.

The device triggers a reset in various conditions, such as thermal shutdown, overcurrent, and a watchdog timer expiration. The overcurrent protection feature works by monitoring the voltage across a sense resistor connected to the V DD pin of the TL7709ACDR. If the voltage exceeds the programmed voltage level, the output is reset. Similarly, the watchdog timer will reset the output after expiration of the set timeout period, which is dependant on an external capacitor connected to the WD pin.

The TL7709ACDR has two outputs: RESET and RESETB. The RESET output is active-low for signaling fault conditions, and RESETB is an open-drain active-low output for providing a reset indication back to a microcontroller. The RESET output can sink up to 10mA of current, enabling it to drive a transistor, thereby initiating a reset action.

In addition to the active-low reset generator, the TL7709ACDR also provides a power on reset (POR) feature. The RESET output is held in reset during device power-up, providing protection during startup. The POR circuit is also used to detect power-down conditions during normal operation, and when the POR circuit is triggered, the RESET output goes low.

In summary, the TL7709ACDR is a dual supervisor IC with features such as a watchdog timer, overcurrent protection, power on reset and thermal shutdown. Its features make it ideal for applications that require resetting or rebooting after fault conditions, and in protection systems for embedded systems and industrial automation machines.

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