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TPS3839L30DQNR Datasheet(PDF) 10 Page - Texas Instruments |
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TPS3839L30DQNR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 24 page RESET GND TPS3839K33 VDD RST Microprocessor 3.3 V VCC 47 k: V DD GND TPS3831 20 kW MR TPS3831 TPS3839 SBVS193B – JUNE 2012 – REVISED APRIL 2013 www.ti.com MANUAL RESET (MR) INPUT (TPS3831 Only) The manual reset (MR) input allows a processor, or other logic devices, to initiate a reset (TPS3831 only). A logic low (0.3 VDD) on MR causes RESET to assert. After MR returns to a logic high and VDD is greater than the threshold voltage, RESET is deasserted after the reset delay time, td, elapses. Note that MR is internally tied to VDD with a 20-k Ω resistor; therefore, this pin can be left unconnected if MR is not used. If a logic signal driving MR does not go fully to VDD, there will be some additional current draw into VDD as a result of the internal pull- up resistor on MR. To minimize current draw, a logic-level FET can be used, as illustrated in Figure 16. Figure 16. Using Logic-Level FET to Minimize Current Draw BIDIRECTIONAL RESET PINS Some microcontrollers have bidirectional reset pins that act both as an input and an output. A series resistor should be placed between the TPS383x output and the microcontroller reset pin to protect against excessive current flow when both the TPS383x and the microcontroller attempt to drive the reset line. Figure 17 shows the connection of the TPS3839K33 with a microcontroller using a series resistor to drive a bidirectional reset line. Figure 17. Connection to Bidirectional Reset Pin 10 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Product Folder Links: TPS3831 TPS3839 |
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