TPS3809K33DBVR Detailed explanation of pin function specifications and circuit principle instructions

The model number "TPS3809K33DBVR" refers to a specific part from Texas Instruments (TI), which is a leading semiconductor company. This part, specifically the TPS3809K33DBVR, is a voltage supervisor, a type of integrated circuit (IC) designed to monitor the voltage levels in a system and provide a reset signal when the voltage falls below a certain threshold.

The "DBVR" at the end of the part number typically refers to the specific packaging type, which is usually a small, surface-mountable SOT-23 package. In this case, it's likely a 5-pin SOT-23 package, based on the typical packaging and pin count for this kind of voltage supervisor IC.

Pin Function Specifications and Circuit Principle

Package and Pin Count

The TPS3809K33DBVR is commonly packaged in a 5-pin SOT-23 form factor. The following provides a detailed explanation of the pin functions:

Pin No. Pin Name Pin Function Description 1 VDD Positive supply voltage (typically 3.3V for this variant). Connect to the system power supply. 2 GND Ground. Connect to the system ground. 3 RESET Active low reset output. When the input voltage falls below the threshold, the reset output is activated (low). 4 SENSE Voltage sense input. Monitors the input voltage for drop below the threshold. 5 N.C. No connection. This pin is unused and should be left open or unconnected.

Circuit Principle Overview

The TPS3809K33DBVR monitors the input voltage (VDD) and issues a RESET signal when the voltage falls below the specified threshold. The SENSE pin compares the input voltage with the threshold voltage (3.3V in this case). If the voltage drops below the threshold (typically around 3.3V), the RESET pin is pulled low, signaling that the system needs to be reset. Once the input voltage recovers above the threshold, the RESET pin will return to a high state (inactive).

The function is designed to ensure that the system is not operating when the power supply voltage is insufficient, which could lead to unreliable operation.

Frequently Asked Questions (FAQ) for TPS3809K33DBVR

Q: What is the threshold voltage of the TPS3809K33DBVR? A: The threshold voltage for the TPS3809K33DBVR is 3.3V. Q: How many pins does the TPS3809K33DBVR have? A: The TPS3809K33DBVR has 5 pins. Q: What type of package is the TPS3809K33DBVR available in? A: The TPS3809K33DBVR is available in a 5-pin SOT-23 package. Q: What is the voltage range for VDD? A: The VDD voltage range for the TPS3809K33DBVR is typically between 1.8V and 5.5V. Q: What does the RESET pin do? A: The RESET pin is an active low output that signals when the voltage falls below the threshold, indicating the need for a reset. Q: Can I use the TPS3809K33DBVR for voltages other than 3.3V? A: No, the TPS3809K33DBVR is specifically designed with a 3.3V threshold voltage. For different voltages, you would need a different variant of the TPS3809 series. Q: What should I do with the N.C. pin? A: The N.C. (No Connect) pin should be left open or unconnected. Q: How accurate is the voltage threshold? A: The threshold voltage is typically accurate to ±2%, but always check the datasheet for the exact tolerances. Q: How do I connect the SENSE pin in my circuit? A: The SENSE pin should be connected to the same voltage that you want to monitor. If you're monitoring VDD, connect it to the VDD rail.

Q: Can I use the TPS3809K33DBVR for 5V systems?

A: Yes, you can use the TPS3809K33DBVR in 5V systems, but it will only trigger a reset if the voltage drops below 3.3V.

Q: What is the operating temperature range for the TPS3809K33DBVR?

A: The operating temperature range is typically from -40°C to +125°C.

Q: Can the TPS3809K33DBVR be used for 1.8V systems?

A: No, the TPS3809K33DBVR is not suitable for 1.8V systems. For 1.8V systems, you would need a part with a 1.8V threshold.

Q: What is the current consumption of the TPS3809K33DBVR?

A: The current consumption of the TPS3809K33DBVR is typically in the range of microamperes (uA) when in a quiescent state.

Q: What is the reset delay time for the TPS3809K33DBVR?

A: The reset delay time is typically around 200ms, but this can vary slightly depending on the application.

Q: What kind of reset output does the TPS3809K33DBVR provide?

A: The TPS3809K33DBVR provides an active low reset output, meaning it pulls the RESET pin low when the voltage falls below the threshold.

Q: Can the TPS3809K33DBVR be used in automotive applications?

A: Yes, the TPS3809K33DBVR is qualified for use in automotive applications, with the appropriate temperature and voltage ranges.

Q: Is there a way to adjust the threshold voltage?

A: No, the threshold voltage is fixed at 3.3V for this particular variant. Texas Instruments does offer other variants with different threshold voltages.

Q: How should I layout the PCB for the TPS3809K33DBVR?

A: Proper PCB layout should ensure that the SENSE pin is properly connected to the monitored voltage and that the RESET pin is routed to the correct reset circuit for the system.

Q: Is the TPS3809K33DBVR internally protected against overvoltage?

A: The device has built-in protection, but for higher reliability, it’s recommended to use external protection circuits if the system is exposed to significant voltage spikes.

Q: How do I ensure proper operation of the TPS3809K33DBVR?

A: Ensure that the input voltage is within the specified range (1.8V to 5.5V) and that the SENSE pin is correctly connected to the voltage rail you wish to monitor.

I hope this detailed explanation helps! Let me know if you need more information.