STM6778TGWB6F Integrated Circuits (ICs)

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The STM6778TGWB6F is a low cost, 3.3 V/3.6V Micro-Power supervisor integrated circuit, dedicated to providing reset, watchdog and power supply monitoring functions for embedded systems. It is designed to detect system reset conditions, the most common of which are power-up, power supply voltage, and watchdog events. In addition, the supervisor can monitor battery-powered systems for low-battery conditions.

The STM6778TGWB6F is designed to monitor system power supply performance and detect power failure or brownout conditions. The reset output is driven low whenever a monitored threshold is exceeded and can be used to control other system components, such as power supplies, or generate an interrupt or system reset.

The STM6778TGWB6F’s Reset Output is active low, and it pulls the RSTn pin low during reset, asserting a logic “0” state. An enable input, ENn, is used to disable the reset output and pull the RSTn pin high, allowing the device to assert a logic “1” state. The device has a power-on reset circuit which is implemented by a resistive voltage divider, allowing the user to set up a wide input voltage range for reliable power supply monitoring.

The STM6778TGWB6F can also detect a watchdog event, signaling a problem with the system and forcing a reset, if enabled. The watchdog input is normally held low and is toggled high at regular intervals by the system software. If the watchdog signal is not toggled in the specified amount of time an internal timer will time out, forcing the reset output high. In addition, the supervisor has an internal reset window function, preventing false or spurious resets due to high voltage transients.

The STM6778TGWB6F also features an adjustable power-on reset trigger voltage, allowing the user to choose a voltage threshold, such as 3.3 V or 3.6 V, to detect a powerfail reset condition. The supervisor detects power-on reset triggers from 1.8 V to 10 V, depending on the selected power-on reset threshold. The device can also detect asynchronous low voltage reset events which can be generated from a low battery warning circuit.

To save power and maximize battery life, the STM6778TGWB6F can be put into a low power mode through the use of a dedicated enable pin. When low power mode is enabled, the supervisor’s watchdog, reset, and power monitor functions are disabled and only the power-on reset will be asserted. The device also has over-voltage protection which monitors input voltage to prevent overcharging and damaging of the system.

The STM6778TGWB6F is a robust and reliable supervisor device, with a wide range of applications in the embedded industry. Its low power consumption and high level of accuracy make it an ideal choice for designers requiring a powerful system supervisor. The device is suitable for monitoring voltage levels, resetting the system, detecting power failure conditions, and providing protection from overvoltage events.

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