TPS3808G18DBVR Detailed explanation of pin function specifications and circuit principle instructions
The model TPS3808G18DBVR is a voltage supervisor IC manufactured by Texas Instruments (TI). It is used for monitoring Power supplies in various electronic devices and ensures that voltage levels are within a specific range to prevent system malfunctions.
Packaging:
The TPS3808G18DBVR comes in a VSON-6 (5mm x 4mm) package. The "V" refers to the VSON (Very Small Outline No-lead) package, which is a type of surface-mount package designed for small space requirements.
Pin Function Specifications and Circuit Principle:
Here is a detailed description of the pins for the TPS3808G18DBVR (VSON-6 package):
Pin Number Pin Name Pin Function Description 1 VDD Power Supply Pin: Provides the positive supply voltage for the IC. The typical operating range is from 1.4V to 5.5V. 2 GND Ground Pin: Connects to the ground of the system. Ensures the IC has a reference voltage. 3 NC No Connection Pin: Not connected internally to the IC circuit. This pin is typically used for package configuration. 4 RESET Reset Output Pin: Active-low output that indicates the status of the monitored voltage. It is pulled low if the voltage is out of range or during power-up reset. 5 SENSE Sense Pin: Connects to the voltage rail being monitored. It senses the voltage level for comparison with the internal reference voltage. 6 VIT+ Voltage Threshold Pin (Positive): A reference voltage input for defining the threshold level for monitoring the supply voltage. Typically connected to an external voltage divider or reference source.Pinout Explanation (in detail):
Pin 1 (VDD): This pin provides the main power for the device. It should be connected to the power rail of the system. The typical voltage range is from 1.4V to 5.5V. Pin 2 (GND): This pin serves as the ground connection for the IC. It is crucial for the IC to have a stable ground reference. Pin 3 (NC): No connection is required for this pin. It is purely for package configuration and does not affect functionality. Pin 4 (RESET): This is the output pin. It will be pulled low when the voltage is not within the specified range (monitoring range). A logic-level low on this pin can indicate a fault or an error in the monitored voltage supply. Pin 5 (SENSE): The sense pin is used to detect the voltage level of the supply you are monitoring. When the supply voltage falls below the reference threshold, the reset output will activate. Proper placement and routing of this pin are critical for accurate voltage detection. Pin 6 (VIT+): This pin allows you to set a reference threshold for the monitoring voltage. By adjusting the external resistors connected to this pin, you can define the voltage at which the reset will trigger, ensuring your system operates only when the voltage is within the desired range.Detailed FAQ (Frequently Asked Questions) for TPS3808G18DBVR:
What is the function of the RESET pin on the TPS3808G18DBVR? The RESET pin is an active-low output that signals when the monitored voltage is out of range or during a power-up reset. When the voltage is within the acceptable range, the reset pin will be high. Can the TPS3808G18DBVR be used to monitor multiple voltages simultaneously? No, the TPS3808G18DBVR is designed to monitor a single voltage rail. If you need to monitor multiple rails, multiple supervisors must be used. What voltage range does the TPS3808G18DBVR operate in? The operating voltage range for the TPS3808G18DBVR is from 1.4V to 5.5V. What is the significance of the SENSE pin on the device? The SENSE pin is where the voltage to be monitored is connected. It continuously monitors the supply voltage, and if the voltage falls below the threshold, the RESET pin will be triggered. How do I set the threshold voltage on the TPS3808G18DBVR? The threshold voltage is set through an external resistor divider network connected to the VIT+ pin. By adjusting the resistors, you can set the specific voltage level at which the reset will occur. Is the TPS3808G18DBVR suitable for low-power applications? Yes, the TPS3808G18DBVR is a low-power voltage supervisor, making it ideal for battery-powered and energy-sensitive applications. What is the response time of the TPS3808G18DBVR when a voltage fault occurs? The response time depends on the characteristics of the system and the specific application, but typically the reset signal will be asserted within microseconds after detecting a voltage fault. Can the TPS3808G18DBVR be used for automotive applications? Yes, the TPS3808G18DBVR is suitable for automotive applications, as it has a wide voltage range and can operate in demanding environments. What is the role of the VDD pin on the device? The VDD pin supplies the operating voltage for the IC. It is necessary for the IC to function and must be connected to a stable voltage supply within the operational range.What is the purpose of the NC pin?
The NC pin is a no-connect pin and does not serve any functional purpose in the operation of the IC. It is typically used for package design purposes.How accurate is the voltage threshold on the TPS3808G18DBVR?
The voltage threshold accuracy is typically within ±2%, depending on the external components used to set the threshold.Can I use the TPS3808G18DBVR to monitor the battery voltage?
Yes, the TPS3808G18DBVR can be used to monitor battery voltage, especially in low-voltage systems where accurate power supervision is required.What happens if the supply voltage drops below the threshold?
If the supply voltage drops below the threshold, the RESET pin will be pulled low, signaling that a fault has occurred and the system should be reset.What is the maximum current draw for the TPS3808G18DBVR?
The typical supply current for the device is very low, around 10µA, making it suitable for low-power systems.Can I use the TPS3808G18DBVR for 3.3V logic systems?
Yes, the device is compatible with 3.3V logic systems, and you can set the threshold appropriately using external components.What is the role of the VIT+ pin in the device?
The VIT+ pin is used to set the threshold voltage for the monitored supply. It connects to a resistor divider or reference source to adjust the threshold.Can I use the TPS3808G18DBVR in a system with varying power supply voltages?
Yes, the TPS3808G18DBVR is designed to handle systems with varying power supply voltages as long as the voltage stays within the specified operating range.What is the voltage reference for the TPS3808G18DBVR?
The voltage reference for the TPS3808G18DBVR is an internal bandgap reference, which provides a stable voltage for comparison with the monitored supply.How do I connect the SENSE pin to my voltage rail?
The SENSE pin should be directly connected to the voltage rail that you want to monitor, ensuring the pin can accurately detect voltage variations.What kind of reset behavior does the TPS3808G18DBVR provide?
The reset output is active-low and remains low when the supply voltage is out of range. It is typically used to trigger a system reset or other corrective actions.If you'd like further details or a deeper dive into specific aspects, feel free to ask!