TPS3813K33QDBVRQ1 Detailed explanation of pin function specifications and circuit principle instructions

The component you're referring to, TPS3813K33QDBVRQ1, is a part manufactured by Texas Instruments. It is a part of their voltage supervisor family, designed to monitor voltage levels and provide a reset function for systems.

Package and Pinout Details:

This component is packaged in the SOT-23-6 package, which means it has 6 pins in total. Below is a detailed description of the pin functions for the TPS3813K33QDBVRQ1.

Pin Function Table:

Pin Number Pin Name Pin Function 1 VCC Supply voltage input. Connect to the positive supply voltage, typically between 1.8V and 5.5V. 2 GND Ground connection. It should be connected to the ground of the system. 3 RESET Active-low reset output. This pin goes low when the monitored voltage drops below the threshold. It resets the system. 4 NC No connection. This pin is not used and should be left unconnected. 5 SENSE Voltage sense input. This pin is used to monitor the supply voltage level. It is connected to the monitored voltage rail. 6 REF Reference voltage input. It can be used for fine-tuning the threshold voltage level. It typically requires a low-voltage reference, like a voltage divider.

Detailed Pin Function Description:

Pin 1 - VCC: This is the power supply input pin of the TPS3813K33QDBVRQ1. The voltage on this pin provides power to the device. The supported voltage range for VCC is typically 1.8V to 5.5V. It should be connected to the system's power supply.

Pin 2 - GND: This is the ground connection for the device. All other signal paths must have a common reference to this pin to ensure proper operation of the supervisor circuit.

Pin 3 - RESET: This is the active-low reset output pin. When the monitored voltage drops below the threshold, the RESET pin will go low. This pin can be used to trigger a reset signal for a microcontroller or other digital circuits. Once the voltage returns to a valid level, the RESET pin will go high again.

Pin 4 - NC (No Connection): This pin does not serve any functional purpose and should not be connected to anything in the circuit. It is often used for packaging reasons.

Pin 5 - SENSE: The SENSE pin is the input that monitors the supply voltage. This pin is directly connected to the voltage rail you want to monitor. The threshold at which the device will assert the reset signal is determined by the voltage on this pin.

Pin 6 - REF: The REF pin is used to connect a reference voltage that defines the threshold for triggering the reset. This voltage typically comes from a low-voltage reference source, which can be configured via a voltage divider.

Pin Function FAQs (Frequently Asked Questions)

Q: What is the supply voltage range for TPS3813K33QDBVRQ1? A: The supply voltage range for TPS3813K33QDBVRQ1 is between 1.8V and 5.5V.

Q: How do I connect the RESET pin? A: The RESET pin is connected to the reset circuitry of your system. When the monitored voltage drops below the threshold, this pin will go low to trigger a reset.

Q: Can I use the REF pin to set the voltage threshold? A: Yes, the REF pin can be used to set the voltage threshold for triggering the reset signal. You can connect a voltage divider or another reference source to this pin.

Q: What does the SENSE pin do? A: The SENSE pin is used to monitor the voltage level of the supply rail. It compares the voltage to the threshold defined by the REF pin.

Q: Should the NC pin be connected? A: No, the NC (No Connection) pin should not be connected to anything. It is reserved and does not serve any functional purpose.

Q: Is the RESET pin active-high or active-low? A: The RESET pin is active-low, meaning it goes low when the monitored voltage is below the threshold.

Q: What happens when the monitored voltage exceeds the threshold? A: When the monitored voltage exceeds the threshold, the RESET pin will return to a high state, indicating that the system is stable.

Q: What is the function of the GND pin? A: The GND pin provides the ground reference for the device, ensuring proper voltage levels across the circuit.

Q: Can I use the TPS3813K33QDBVRQ1 for any voltage rail? A: Yes, you can monitor any voltage rail, but the SENSE pin must be connected to the rail you want to monitor.

Q: What is the maximum voltage that can be applied to the SENSE pin? A: The maximum voltage that can be applied to the SENSE pin should not exceed the supply voltage (VCC) of the device.

Q: Can I use a resistor network for the REF pin? A: Yes, a resistor network can be used to create a reference voltage for the REF pin. It is typically done via a voltage divider.

Q: How do I determine the reset threshold voltage? A: The reset threshold is set by the voltage at the REF pin. You can adjust the reference voltage to change the reset threshold.

Q: Can the TPS3813K33QDBVRQ1 be used for 3.3V systems? A: Yes, the TPS3813K33QDBVRQ1 is compatible with 3.3V systems and can monitor voltages in that range.

Q: Is there an external capacitor required for the RESET pin? A: In many designs, a capacitor can be added to the RESET pin to smooth the reset signal, but it is not strictly necessary.

Q: How does the TPS3813K33QDBVRQ1 behave during power-up? A: Upon power-up, the TPS3813K33QDBVRQ1 will monitor the voltage levels. The RESET pin will be high as long as the voltage is within the valid range.

Q: Can the RESET pin drive other devices? A: Yes, the RESET pin can be used to drive other devices, such as microcontrollers, to trigger a system reset when the voltage falls out of range.

Q: Does the TPS3813K33QDBVRQ1 have any built-in protection? A: Yes, it has internal circuitry to protect against short circuits and overvoltage situations.

Q: What is the typical reset threshold voltage? A: The typical reset threshold voltage depends on the specific reference voltage used, but for a 3.3V system, it is generally around 3.3V.

Q: How do I calculate the reset threshold for my design? A: The reset threshold can be determined based on the reference voltage applied to the REF pin and the voltage monitored at the SENSE pin.

Q: Can I use the TPS3813K33QDBVRQ1 in automotive applications? A: Yes, the TPS3813K33QDBVRQ1 is rated for automotive applications and can handle wide temperature ranges and voltage variations.

This description should help clarify the pin functionality and usage instructions for your TPS3813K33QDBVRQ1 component. If you need any more detailed information, feel free to ask!