TPS3813K33QDBVRQ1 Detailed explanation of pin function specifications and circuit principle instructions（113 ）

The model you mentioned, "TPS3813K33QDBVRQ1," is part of Texas Instruments' portfolio. It is a voltage supervisor or reset IC used in Power management and reset applications for various systems. Below, I will provide the requested details, including the pinout, function specifications, and an FAQ in the required format.

Model: TPS3813K33QDBVRQ1

Brand: Texas Instruments

Package Type: QFN (Quad Flat No-leads)

Pin Count: 20 pins (QFN-20)

Pin Function and Specifications:

Pin Number Pin Name Pin Function Description 1 VDD Power supply input pin. Connect to the supply voltage (typically 3.3V). 2 GND Ground pin. Connect to the system ground. 3 NR Noise reduction input pin. Typically used with an external capacitor to reduce noise. 4 SENSE Input for the voltage detection threshold. Connect to the monitored voltage. 5 RESET Active low reset output. This pin goes low when the monitored voltage is below the threshold. 6 RESET Active low reset output. This pin goes low when the monitored voltage is below the threshold. 7 SENSE Input for the voltage detection threshold. Connect to the monitored voltage. 8 GND Ground pin. Connect to the system ground. 9 VDD Power supply input pin. Connect to the supply voltage (typically 3.3V). 10 SENSE Voltage sensing input pin. Connect to the monitored voltage. 11 SENSE Voltage sensing input pin. Connect to the monitored voltage. 12 SENSE Voltage sensing input pin. Connect to the monitored voltage. 13 RESET Active low reset output. This pin goes low when the monitored voltage is below the threshold. 14 RESET Active low reset output. This pin goes low when the monitored voltage is below the threshold. 15 NR Noise reduction input pin. Typically used with an external capacitor to reduce noise. 16 GND Ground pin. Connect to the system ground. 17 RESET Active low reset output. This pin goes low when the monitored voltage is below the threshold. 18 SENSE Voltage sensing input pin. Connect to the monitored voltage. 19 RESET Active low reset output. This pin goes low when the monitored voltage is below the threshold. 20 VDD Power supply input pin. Connect to the supply voltage (typically 3.3V).

Pinout Overview:

The VDD pins (pins 1, 9, 20) are the power supply input pins and should be connected to the supply voltage. The GND pins (pins 8, 16) are ground pins and should be connected to the system ground. RESET pins (pins 5, 6, 13, 14, 17, 19) provide the reset signal when the monitored voltage falls below the set threshold. SENSE pins (pins 4, 7, 10, 11, 12, 18) are used for voltage sensing and are connected to the monitored voltage. NR pins (pins 3, 15) are used for noise reduction by connecting external capacitors.

FAQ – Frequently Asked Questions:

What is the function of the VDD pin in the TPS3813K33QDBVRQ1 model? The VDD pin is the power supply input pin. It should be connected to the system's supply voltage, typically 3.3V.

How should the RESET pins be used in the TPS3813K33QDBVRQ1? The RESET pins are active low reset outputs, indicating that the monitored voltage has fallen below the threshold. These pins should be connected to the reset logic of the system.

What is the role of the SENSE pins in the TPS3813K33QDBVRQ1? The SENSE pins are used to sense the monitored voltage. These pins are typically connected to the voltage rail that needs monitoring.

Can the TPS3813K33QDBVRQ1 be used with a supply voltage of 5V? No, the TPS3813K33QDBVRQ1 is designed for use with 3.3V supply voltage, and using a higher voltage may damage the device.

What is the NR pin used for in the TPS3813K33QDBVRQ1? The NR pin is used for noise reduction. An external capacitor is typically connected to this pin to filter noise and improve the accuracy of the voltage monitoring.

Is there a maximum capacitance value for the NR pin? Yes, the recommended capacitance value for the NR pin is typically between 10nF and 100nF.

How do I choose the appropriate threshold for the SENSE pin? The threshold for the SENSE pin is determined by the supply voltage and the specific application needs. The TPS3813K33QDBVRQ1 has a threshold of 3.3V by default, but other values can be configured.

What happens when the monitored voltage is above the threshold? When the monitored voltage is above the threshold, the RESET pins will remain high, indicating that the system is operating normally.

What happens if the monitored voltage falls below the threshold? When the monitored voltage falls below the threshold, the RESET pins will go low, signaling a reset condition to the system.

Can I use the TPS3813K33QDBVRQ1 in battery-operated devices? Yes, as long as the supply voltage is 3.3V, the TPS3813K33QDBVRQ1 can be used in battery-powered applications.

What is the maximum output current of the RESET pin? The RESET pin can sink up to 10mA of current, but it is recommended to use a pull-up resistor to limit current flow.

Can I use the TPS3813K33QDBVRQ1 without connecting the NR pin? While the NR pin can be left unconnected, connecting a small capacitor helps improve the device’s performance by filtering noise.

What is the thermal rating of the TPS3813K33QDBVRQ1? The TPS3813K33QDBVRQ1 has a maximum operating temperature of 125°C and a junction temperature range of -40°C to 125°C.

Can the TPS3813K33QDBVRQ1 monitor multiple voltages? The device is designed to monitor a single voltage rail. For monitoring multiple voltages, you would need multiple instances of the device.

What is the typical supply current consumption of the TPS3813K33QDBVRQ1? The typical supply current consumption is around 30µA during normal operation.

What package types are available for the TPS3813K33QDBVRQ1? The TPS3813K33QDBVRQ1 is available in a QFN-20 package.

How do I calculate the reset threshold? The reset threshold is typically set by an internal reference voltage and can be adjusted with external components if necessary.

What is the output state of the RESET pin when the device is in sleep mode? In sleep mode, the RESET pin may remain low, indicating that the monitored voltage is out of range.

Can I use the TPS3813K33QDBVRQ1 in a 5V system? No, it is designed for 3.3V systems and should not be used in a 5V system.

How fast does the TPS3813K33QDBVRQ1 respond to voltage fluctuations? The response time is typically very fast, with reset signals being triggered within microseconds after the threshold is crossed.

This information should help in fully understanding the pinout, function, and potential usage of the TPS3813K33QDBVRQ1 model.