TPS3600D33PWR

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The TPS3600D33PWR is a member of Texas Instrument’s (TI) supervisory circuit family, which provide reset and power-on-reset (POR) functions to MPUs, microprocessors, ASICs and PLDs. The TPS3600D33PWR is a lower cost, low quiescent current, low-dropout reset supervisor with a fixed 3.3V voltage threshold. The device includes two comparators with independent thresholds, two open-drain outputs, manual reset and a watchdog/window watchdog timer.

Application Field

The TPS3600D33PWR is best suited for core voltage or I/O voltage systems. For example, the TPS3600D33PWR can be used in a system to monitor the core voltage of an MPU, microprocessor, ASIC or PLD and can reset the system if the voltage exceeds or drops below a certain threshold. Additionally, the TPS3600D33PWR can be used to provide system reset after power-on and to keep low voltage systems from resetting unnecessarily.

The reset output of the TPS3600D33PWR will exit reset state on a falling edge of the reset signal. This signal can be used to initialize the logic elements on power-up or after a reset. The device is also well suited for supervision of an auxiliary supply, such as an SRAM configuration. The I/O voltage of the TPS3600D33PWR is 3.3V and is specified to work over the -40°C to 125°C temperature range. The device also features an override reset function that can be used to manually reset the system. This feature is useful in debugging or when a reset needs to be triggered externally.

Working Principle

The TPS3600D33PWR is reset supervisor. The device sources and sinks a ground-referenced open-drain output signal when the input voltage exceeds a certain threshold. The reset signal is generated from two independent comparators; each has a separate adjustable threshold pin. The device also features an internal resistor network, which allows the user to set the voltage threshold. The output from the comparator is utilized to start an internal counter. When the counter reaches a given time, the reset signal is generated. When an external reset is signaled, a reset signal is also generated.

The device also has an internal watchdog timer and a window watchdog timer. The watchdog timer monitors the system health by monitoring the activity of the reset signal. If the expected reset activity is not detected, the watchdog timer will trigger a reset condition. Similarly, the window watchdog timer monitors the activity of the reset signal within predetermined “windows”. If the reset signal is not within the range of the window, a reset condition is triggered.

The TPS3600D33PWR also features an override reset pin. The pin allows the user to manually reset the system when necessary. Additionally, the TPS3600D33PWR has a temperature-compensated reset threshold. This feature ensures that the device generates accurate reset signals even if the temperature of the system is changed.

In summary, the TI TPS3600D33PWR is a low-dropout reset supervisor with an adjustable reset threshold and a variety of reset-related features. The device is suitable for use in a variety of applications, including core voltage and I/O voltage system monitoring, as well as reset supervision after power-on or manual override reset. The device is specified to work within the -40°C to 125°C temperature range.

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