TPS3838K33DBVR

TPS3838K33DBVR

Part Number: TPS3838K33DBVR

Manufacturer: Texas Instruments

Description: Supervisory Circuits 220nA w/ 10ms/200ms Select delay time

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TPS3838K33DBVR DESCRIPTION

Initialization and timing supervision is handled by the TPS3837, TPS3836, and TPS3838 families of supervisory circuits. Most of these circuits are designed to work with digital signal processors and other processor-based systems. The RESET signal is asserted throughout the power-on procedure when VDD, the supply voltage, exceeds 1.1 V. The supervisory circuit will then continue monitoring VDD and ensuring that the RESET output remains active while VDD is less than the VIT threshold voltage. To ensure that the system is reset properly, an internal timer delays the output’s return to its inactive state (high). As soon as VDD surpasses the threshold voltage VIT, the delay time will begin to count down in seconds.

Whenever CT is connected to GND, a constant delay time of around 10 milliseconds is asserted. When connected to VDD, the delay time is measured milliseconds (ms). Once the input voltage drops below the critical level known as the threshold voltage VIT, the output returns to its active (low) state. The fixed-sense threshold voltage (VIT) shared by all devices in this family is determined by an internal voltage divider.

The RESET output of the TPS3836 is an active-low push-pull configuration. The RESET output of the TPS3837 is active-high and push-pull, whereas the RESET output of the TPS3838 is active-low and open-drain. The blank product spectrum was designed with 1.8 V, 2.5 V, 3.0 V, and 3.3 V supply voltages. Blank Depending on your preference, the circuits can be purchased in either a SOT23-5 or 2×2 SON-6 package. The operating temperature range for the TPS3836, TPS3837, and TPS3838 families is between –40 degrees Celsius and +85 degrees Celsius.

TPS3838K33DBVR Features

  • 220 nA is the supply current (typical)
  • 8 V to 3.3 V, 2.5 V to 3.0 V, and 3.33 V are the precision supply voltage supervision ranges.
  • Power-on reset generator with a choice of a 200 or a 10-millisecond delay
  • Open drain RESET output, Push and Pull RESET output (TPS3836), and Push and Pull RESET output (TPS3837) (TPS3838)
  • Reset manually
  • 2-mm, 6-pin SON packages and 5-pin SOT23 connectors.
  • Range of temperatures: -40°C to 85°C

TPS3838K33DBVR Applications

  • Applications using low-power DSPs, microprocessors, and microcontrollers.
  • Portable- and battery-powered equipment
  • Intelligent instruments
  • Wireless communication systems
  • Notebook computers
  • Applications using the MSP430™

Feature Description Input Voltage (VDD)

The reset output is asserted to an active state after the propagation delay time (tPHL for TPS3836 and TPS3838, and tPLH for TPS3837) when the voltage at VDD falls below VIT. This happens due to the VDD pin’s internal comparator, which it uses to check the input voltage. The reset output will deassert and enter the inactive state after the reset delay time, which is indicated by tD when VDD is greater than VIT plus VHYS, and MR is in the logic high state. It is significant to remember that despite having the same label, the VDD and MR pins have different propagation delays.

● Manual Reset (MR)

The reset output asserts the active state after a propagation delay of tPHL for the TPS3836, TPS3838, and TPLH for the TPS3837 when MR is logic low. The reset output will become inactive after tD seconds of MR being a logic high and VDD being greater than VIT. As previously mentioned, the VDD and MR pins share a label but have various propagation delays.

● Selectable Reset Delay (CT)

The reset delay, tD, can be set to 10 milliseconds by connecting CT to GND. However, connecting CT to VDD can be set to 200 milliseconds.

● Reset Output (RESET / RESET)

Push-pull, the TPS3836 provides active-low RESET output. When it is not active, the RESET output has a high logic value, but when it is active, it has a low logic value. This device does not need a pullup resistor to function. Push-pull, the TPS3837 provides active-high RESET output. When the function is not active, the RESET output has a low logic value but a high logic value when it is active. This device does not need a pullup resistor to function. The TPS3838 features an active-low RESET output with an open-drain design. When it is not active, the RESET output has a high logic value, but when it is active, it has a low logic value. A pull-up resistor is necessary for use with this device.

Application Information

The following paragraph will walk you through an example of common use for this device. This is only meant to illustrate because the requirements for various applications can vary greatly.

Design Requirements

This application monitors the 3.6-volt battery and sends an Undervoltage fault signal to the microcontroller if the battery’s voltage falls below 3 volts. The application will not clear the Undervoltage error until the battery voltage has been at or above 3 V for a time typically exceeding 200 milliseconds. The application cannot consume anything.

Detailed Design Procedure

Because the Undervoltage threshold for the TPS3836K33 device variant is typically 2.93 V, the TPS3836K33 should be selected as the device variant of choice. This satisfies the application’s requirement that there be no Undervoltage faults. Connect CT to VDD to select the 200-ms reset delay option, allowing you to release the Undervoltage fault condition after the battery has exceeded 3 V for 200 milliseconds. If you go with the push-pull variant of the TPS3836, you won’t need to buy a pull-up resistor because that component isn’t necessary for the push-pull variant. This family of devices has a maximum Iq of 450 nA, which satisfies the required amount of current consumption requirement.

Power Supply Recommendations

These devices require 1.6 V to 6 V input voltage. TI recommends placing an input supply capacitor between VDD and GND. On the VDD pin, this device has a maximum rating of 7 V, which is the absolute maximum. Extra safety measures should be taken if the voltage supply that supplies power to VDD is prone to large voltage spikes exceeding 7 V.

Conclusion

Using Texas Instruments’ TPS3838K33DBVR supervisory circuit for a microprocessor, your system will continue to function normally if the main processor fails. The maximum power dissipated by this unit is 437 mW. Typically, it requires a voltage of 3.3 V to function. It can dissipate up to 437 mW of power at its peak. The product will be protected in transit by tape and reel packaging, making it easy to assemble once it arrives at its destination quickly. This component can function between -40 and 85 degrees Celsius. With a range from 2.84 V to 2.99 V, its reset threshold is typically around 2.93 V. On average, 3.3 V is used to power this device. A supply voltage of 1.6 V is required for operation, with a maximum of 6 V.

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