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TPS3808G19DBVRG4 датащи(PDF) 8 Page - Texas Instruments |
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TPS3808G19DBVRG4 датащи(HTML) 8 Page - Texas Instruments |
8 / 21 page DEVICE OPERATION SENSE INPUT RESET OUTPUT V IN TPS3808G01 V DD SENSE GND RESET R 1 R 2 1nF V =(1+)0.405 IT ¢ R1 R2 V OUT MANUAL RESET (MR) INPUT 2.5V T PS 380 8G 25 O M AP 1510 V DD SENSE V DDSHV 1, 3, 6, 7, 9 GND GND C T MR RESET 1M Ω RESPWRON TPS3808 SBVS050J – MAY 2004 – REVISED AUGUST 2008 .......................................................................................................................................................... www.ti.com supply line can be used to allow the reset signal for The TPS3808 microprocessor supervisory product the microprocessor to have a voltage higher than VDD family is designed to assert a RESET signal when (up to 6.5V). The pull-up resistor should be no either the SENSE pin voltage drops below VIT or the smaller than 10k Ω as a result of the finite impedance manual reset (MR) is driven low. The RESET output of the RESET line. remains asserted for a user-adjustable time after both the manual reset (MR) and SENSE voltages return above the respective thresholds. A broad range of voltage threshold and reset delay time adjustments The SENSE input provides a terminal at which any are available, allowing these devices to be used in a system voltage can be monitored. If the voltage on wide array of applications. Reset threshold voltages this pin drops below VIT, then RESET is asserted. can be factory-set from 0.82V to 3.3V or from 4.4V to The comparator has a built-in hysteresis to ensure 5.0V, while the TPS3808G01 can be set to any smooth RESET assertions and de-assertions. It is voltage above 0.405V using an external resistor good analog design practice to put a 1nF to 10nF divider. Two preset delay times are also bypass capacitor on the SENSE input to reduce user-selectable: connecting the CT pin to VDD results sensitivity to transients and layout parasitics. in a 300ms reset delay, while leaving the CT pin open The TPS3808G01 can be used to monitor any yields a 20ms reset delay. In addition, connecting a voltage rail down to 0.405V using the circuit shown in capacitor between CT and GND allows the designer Figure 11. to select any reset delay period from 1.25ms to 10s. A typical application of the TPS3808G25 used with the OMAP1510 processor is shown in Figure 10. The open-drain RESET output is typically connected to the RESET input of a microprocessor. A pull-up resistor must be used to hold this line high when RESET is not asserted. The RESET output is undefined for voltage below 0.8V, but this is normally not a problem since most microprocessors do not function below this voltage. RESET remains high (unasserted) as long as SENSE is above its threshold Figure 11. Using the TPS3808G01 to Monitor a (VIT) and the manual reset (MR) is logic high. If either User-Defined Threshold Voltage SENSE falls below VIT or MR is driven low, RESET is asserted, driving the RESET pin to a low impedance. The manual reset (MR) input allows a processor or other logic circuits to initiate a reset. A logic low (0.3VDD) on MR causes RESET to assert. After MR returns to a logic high and SENSE is above its reset threshold, RESET is de-asserted after the user defined reset delay expires. Note that MR is internally tied to VDD using a 90kΩ resistor so this pin can be left unconnected if MR will not be used. See Figure 12 for how MR can be used to monitor multiple system voltages. Note that if the logic signal driving MR does not go fully to VDD, there will be Figure 10. Typical Application of the TPS3808 with an OMAP Processor 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 Once MR is again logic high and SENSE is above VIT illustrated in Figure 13. + VHYS (the threshold hysteresis), a delay circuit is enabled which holds RESET low for a specified reset delay period. Once the reset delay has expired, the RESET pin goes to a high impedance state. The pull-up resistor from the open-drain RESET to the 8 Submit Documentation Feedback Copyright © 2004–2008, Texas Instruments Incorporated Product Folder Link(s): TPS3808 |
Аналогичный номер детали - TPS3808G19DBVRG4 |
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Аналогичное описание - TPS3808G19DBVRG4 |
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