SM72240/NOPB

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The Texas Instruments UC2842A is a pulse-mode supervisor designed to reset and continuously monitor a digital system. The device uses an external capacitor to set the reset timeout period, usually a fraction of a second. The device is an integrated circuit that performs the duties of a supervisor integrated circuit: reset, detect power-on, hold-up and power-fail functions. This device is widely used in many applications, particularly in industrial and automotive systems.

The SM72240/NOPB is a high precision multiphase pulse-mode supervisor integrated circuit. It is designed to monitor supply voltages of 3.3V to 5.5V in order to provide over voltage protection in automotive, industrial, and communication applications. The device is capable of generating reset timeout periods up to 8 seconds, significantly longer than other existing supervisors. The device has a wide operating temperature range from -40°C to 105°C, making it ideal for high temperature and harsh operating environments.

The SM72240/NOPB has the ability to detect input power supply voltage faults such as overvoltage and undervoltage conditions and to generate a reset output. The device can also be configured to generate an open-drain active-low reset output as a default and can be reconfigured to generate high-impedance active-high output. An adjustable OV and reset timeout can be configured with external components. The reset output and OV flags are provided to the user and provide a notification when the input voltage is outside the range or in an overvoltage condition.

The SM72240/NOPB incorporates an analog-to-digital converter and other analog circuits to detect various operating conditions. The A/D converter is used to detect an input voltage between 3.2V and 5.5V and convert it to a corresponding digital value. The digital value is then compared with two reference values to determine whether an overvoltage or undervoltage condition is present. The other analog circuits are used to detect fault conditions, overtime and tamper conditions, and monitor the input voltage for a maximum time. If the time exceeds, the reset output is generated to reset the system.

In addition, the SM72240/NOPB incorporates a watchdog timer which can be used to generate a reset signal if a system malfunction occurs. The watchdog timer has a periodic operation and can generate a reset pulse during the period. The duration of the watchdog timer can be configured with external capacitors. More features of the SM72240/NOPB are discussed below.

The SM72240/NOPB can be used in many different applications due to its wide voltage and temperature range and flexible reset timeout configuration. In automotive, industrial and communication applications, the device can be used to protect against overvoltage conditions, provide fault indications and reset the system when necessary. In mobile, portable and consumer electronic devices, the watchdog timer can be used to detect system malfunctions such as I/O system errors or user interface errors and reset the device. The SM72240/NOPB can also be used in vending machines and point of sale terminals for monitoring and resetting the system.

The SM72240/NOPB contains an auto-reset and a manual-reset feature. The auto-reset feature will reset the device when it is powered up and the manual-reset feature can be used to override the auto-reset feature. The device also includes a power-on reset (POR) output which can be used to reset the system when power is applied. The reset signal is generated on-chip and can be directed to the system via an external signal line.

The SM72240/NOPB is a versatile and reliable pulse-mode supervisor. By combining the features of an analog-to-digital converter, watchdog timer, reset circuit and open-drain or high-impedance output options, the device is a very suitable choice for industrial, automotive and communication applications requiring long timeouts and wide temperature and voltage range support. With these features, the device can easily be configured to meet the requirements of any system.

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