The is a microprocessor supervisory circuit with the following functions:
1. Power – On Reset (POR)
• It provides a reset signal to a microprocessor or other digital circuits during power – up. When the power supply voltage rises above a certain threshold (power – on voltage threshold), the SGM809 – TXN3L asserts a reset output. This reset output holds the microprocessor in a reset state until the power supply and other internal conditions are stable. This helps to ensure that the microprocessor starts in a known and valid state.
2. Manual Reset Input
• It has a manual reset input pin. A low – level pulse on this pin forces the reset output to go active, regardless of the power – supply – voltage condition. This manual reset feature is useful for system – level reset operations, such as during system debugging, error recovery, or in response to external events that require a system reset.
3. Watchdog Timer (Optional, depending on configuration)
• In some configurations, it may include a watchdog timer function. The watchdog timer requires the microprocessor to periodically trigger a signal (by toggling a dedicated pin or writing to a specific register). If the microprocessor fails to do so within a specified time period (watchdog timeout period), the SGM809 – TXN3L assumes that the microprocessor has malfunctioned and asserts the reset output. This helps to prevent the system from getting stuck in an abnormal state due to software errors or hardware glitches in the microprocessor.
4. Voltage Monitoring
• The SGM809 – TXN3L continuously monitors the power – supply voltage. If the voltage drops below a specific undervoltage threshold (brown – out threshold), it can assert the reset output. This protects the microprocessor and other digital components from operating at voltages that could cause incorrect behavior or damage. Some versions may also have an overvoltage detection function to further safeguard the system.
5. Output Signal Characteristics
• The reset output signal of the SGM809 – TXN3L is typically an open – drain or open – collector output. This allows for easy interfacing with different types of microprocessors and other digital ICs. The output can be pulled up to the appropriate voltage level using an external resistor, and multiple devices can be connected to the same reset line in a wired – OR configuration.
1. Power – On Reset (POR)
• It provides a reset signal to a microprocessor or other digital circuits during power – up. When the power supply voltage rises above a certain threshold (power – on voltage threshold), the SGM809 – TXN3L asserts a reset output. This reset output holds the microprocessor in a reset state until the power supply and other internal conditions are stable. This helps to ensure that the microprocessor starts in a known and valid state.
2. Manual Reset Input
• It has a manual reset input pin. A low – level pulse on this pin forces the reset output to go active, regardless of the power – supply – voltage condition. This manual reset feature is useful for system – level reset operations, such as during system debugging, error recovery, or in response to external events that require a system reset.
3. Watchdog Timer (Optional, depending on configuration)
• In some configurations, it may include a watchdog timer function. The watchdog timer requires the microprocessor to periodically trigger a signal (by toggling a dedicated pin or writing to a specific register). If the microprocessor fails to do so within a specified time period (watchdog timeout period), the SGM809 – TXN3L assumes that the microprocessor has malfunctioned and asserts the reset output. This helps to prevent the system from getting stuck in an abnormal state due to software errors or hardware glitches in the microprocessor.
4. Voltage Monitoring
• The SGM809 – TXN3L continuously monitors the power – supply voltage. If the voltage drops below a specific undervoltage threshold (brown – out threshold), it can assert the reset output. This protects the microprocessor and other digital components from operating at voltages that could cause incorrect behavior or damage. Some versions may also have an overvoltage detection function to further safeguard the system.
5. Output Signal Characteristics
• The reset output signal of the SGM809 – TXN3L is typically an open – drain or open – collector output. This allows for easy interfacing with different types of microprocessors and other digital ICs. The output can be pulled up to the appropriate voltage level using an external resistor, and multiple devices can be connected to the same reset line in a wired – OR configuration.
