TPS3809K33QDBVRQ1 Detailed explanation of pin function specifications and circuit principle instructions

The part number TPS3809K33QDBVRQ1 belongs to the Texas Instruments (TI) product family. Specifically, this model is a voltage monitor and reset IC with a threshold voltage of 3.3V. It is designed to monitor Power supplies and ensure that voltage levels remain within specified limits, sending reset signals when voltages fall outside those limits.

Packaging and Pinout Description:

The TPS3809K33QDBVRQ1 is available in the QFN (Quad Flat No-lead) 16-pin package type, commonly referred to as QFN-16. It is an environmentally robust device designed for automotive applications (as indicated by the Q1 in the part number), which implies it complies with automotive grade quality standards.

Pin Function Description:

Below is a detailed pinout function list for the TPS3809K33QDBVRQ1 in a QFN-16 package.

Pin Number Pin Name Pin Type Pin Function Description 1 VDD Power Power supply input. Connect to a 3.3V power source. 2 GND Ground Ground connection. Connect to system ground. 3 RST Output Reset output. This pin is driven low during a reset condition and stays low for the duration of the reset. 4 RESET Active Low Reset output (active low). This output signals when a fault condition or reset state is active. 5 SENSE Input Sense input pin that monitors the supply voltage. It connects to the power rail being monitored. 6 VSS Ground Ground pin for the IC. Connect to system ground. 7 EN Input Enable input pin. When pulled high, the device is enabled to monitor the voltage. 8 VOUT Output Output voltage reference for external components or feedback. It sets the threshold reference for reset. 9 VTH Input Voltage threshold pin for setting the desired voltage threshold using an external resistor divider. 10 CT Input capacitor pin for setting the reset timeout duration. A capacitor value determines the reset pulse duration. 11 NC No Connection Not connected to any internal circuitry. Can be left unconnected. 12 NC No Connection Not connected to any internal circuitry. Can be left unconnected. 13 OUT Output Output pin for signaling reset status to external devices or components. 14 VDD_MONITOR Power Input voltage monitoring pin that checks if the monitored voltage is within safe limits. 15 NC No Connection Not connected to any internal circuitry. Can be left unconnected. 16 RST_N Output Reset output (active low). This is the signal that tells the system if the voltage is out of range.

Circuit Principle:

The TPS3809K33QDBVRQ1 is a voltage monitor with a built-in reset functionality. The core of the circuit is designed to monitor the supply voltage level and assert a reset signal if the voltage drops below a certain threshold (typically 3.3V).

VDD powers the chip and must be a stable 3.3V. The SENSE pin is the input that monitors the system voltage. If this voltage falls below the preset threshold, a reset signal is triggered on the RST pin. The EN pin enables or disables the reset function. It controls whether the chip is active or in a shutdown state. The VOUT and VTH pins are used to adjust the threshold voltage of the monitoring system. An external resistor can set the threshold. The CT pin is used for setting the reset timeout. It is connected to an external capacitor, which determines how long the reset signal stays low.

The device helps ensure that a system is properly reset when voltage fluctuations occur or when the supply voltage falls below the desired threshold.

FAQ (Frequently Asked Questions):

What is the operating voltage for TPS3809K33QDBVRQ1? The TPS3809K33QDBVRQ1 operates with a supply voltage of 3.3V. How many pins are in the package of TPS3809K33QDBVRQ1? The TPS3809K33QDBVRQ1 comes in a QFN-16 package, which has 16 pins. Can I use the EN pin to disable the reset function? Yes, pulling the EN pin high enables the reset function. Pulling it low will disable the function. What happens if the SENSE pin detects a voltage lower than 3.3V? If the SENSE pin detects a voltage lower than the threshold, the reset output is triggered and remains active low. What is the purpose of the CT pin? The CT pin is used to set the duration of the reset signal using an external capacitor. It defines the timeout duration for the reset signal. Can the TPS3809K33QDBVRQ1 be used in automotive applications? Yes, the TPS3809K33QDBVRQ1 is an automotive-grade component, indicated by the Q1 suffix, meaning it meets automotive standards. How do I configure the threshold voltage? The threshold voltage can be configured by using external resistors connected to the VTH pin to set the desired monitoring voltage. Is there a way to monitor multiple voltages with a single device? The device is designed to monitor a single voltage. However, you can use multiple devices to monitor different power rails. What is the reset output signal's duration? The reset output duration is determined by the capacitor connected to the CT pin.

What is the typical application for this device?

This device is typically used in power supply systems where voltage monitoring and reset functionality are needed, such as in automotive ECUs, embedded systems, and industrial controls.

Can I use this device with a 5V power supply?

No, the TPS3809K33QDBVRQ1 is designed to operate at a 3.3V supply voltage.

What happens if I connect the VDD pin to the wrong voltage?

If VDD is connected to a voltage higher than 3.3V, the device may be damaged. Always ensure proper voltage is supplied.

What is the reset signal logic level?

The reset signal is active low, meaning it will pull low when the reset condition is met.

What kind of capacitors should be used on the CT pin?

The capacitor used on the CT pin should typically be a ceramic capacitor with a value chosen to set the desired reset timeout duration.

How can I ensure the accuracy of the reset threshold?

The accuracy of the threshold is determined by the resistors used in the voltage divider connected to the VTH pin.

Is the device compatible with low power applications?

Yes, the TPS3809K33QDBVRQ1 is designed with low-power consumption in mind, making it suitable for battery-operated devices.

Can I use the RST and RESET pins for different purposes?

Both the RST and RESET pins serve similar functions; they indicate the reset state. You can use either pin depending on your design needs.

How should the GND pin be connected?

The GND pin should be connected directly to the system's ground.

What is the maximum operating temperature of this device?

The maximum operating temperature for this device is typically up to 125°C, suitable for automotive and industrial environments.

Can the TPS3809K33QDBVRQ1 be used in consumer electronics?

While the device is automotive-grade, it can be used in other applications like industrial systems, but it is not ideal for consumer-grade electronics.

This table and FAQ offer a complete overview of the functionality and usage of the TPS3809K33QDBVRQ1 voltage monitoring and reset IC, ensuring you can effectively use this component in your design.