TLC7733QP

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The TLC7733QP is a Precision Supervisory Circuit from Texas Instruments, typically used in dot matrix LCD environments. It is used to monitor a power supply signal in order to detect any undervoltage or overvoltage conditions that can cause display failure. The device features a controller, reference voltage, comparator and a programmable delay timer.

The TLC7733QP is designed to monitor the power supply voltage, such as the output voltage of power suply circuits or the voltage of batteries used in portable devices. The device has two comparators with open-drain outputs for driving small signal devices, such as LEDs or buzzers. There is a comparator for the undervoltage threshold and another one for the overvoltage threshold.

The device includes a programmable delay timer that can be set from 2.5ms to 1.25s. This timer is used to delay the output signal or the reset pin, allowing software to stabilize the power-up sequence. This delay is useful for systems that are slower or for longer power-up cycles.

The reference voltage is set through three external resistors that control the upper and lower voltage thresholds. The reference voltage is adjustable by the user, allowing flexibility in selecting undervoltage and overvoltage threshold. The open-drain outputs can be connected with different types of pull-up resistors that have different voltage thresholds. This makes the TLC7733QP ideal for different types of applications and environments.

The applications of the TLC7733QP precision supervisory circuit are mainly in LCD modules, such as dot matrix LCDs. This application includes monitors, televisions, portable digital devices and HTI industrial applications. The device can also be used in applications that require voltage measurements and precision voltage control.

The TLC7733QP working principle is based on two comparators that detect undervoltage and overvoltage signals. The undervoltage comparator monitors the power supply voltage and compares it to a programmable lower voltage threshold, set through external resistors. The output signal of this comparator is sent to an open-drain output pin, from which it can be connected with a pull-up resistor. If the power supply voltage is below the programmed voltage threshold, the output pin of the comparator will be pulled to a logic low and the output will be activated.

The overvoltage comparator works in a similar way. The overvoltage comparator monitors the power supply voltage and compares it to a programmable higher voltage threshold, set through external resistors. The output of this comparator will be inactive if the power supply voltage is below the higher threshold. If the power supply voltage is above the programmed voltage threshold, the output will be pulled to a logic low and the output will be activated.

The TLC7733QP also includes a programmable delay timer. This timer helps to delay the active output signal from either the Undervoltage or Overvoltage Comparators. The delay time of the timer can be set from 2.5ms to 1.25s. This feature is useful for systems with longer power-up sequences or for slower systems.

The TLC7733QP precision supervisory circuit is ideal for dot matrix LCDs and other precision voltage control applications. The device includes two comparators for detecting undervoltage and overvoltage signals and an adjustable reference voltage. It also features a programmable delay timer and open-drain outputs for driving small signal devices. All these features make the TLC7733QP an excellent choice for power supply monitoring and control.

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