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TPS3825-50-Q1 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS3825-50-Q1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page 3.3 V V DD 100 nF V DD RESET RESET TPS3823-33-Q1 MSP430C325 MR WDI I/O GND GND TPS3820-33-Q1, TPS3820-50-Q1, TPS3823-25-Q1 TPS3823-30-Q1, TPS3823-33-Q1, TPS3823-50-Q1, TPS3824-30-Q1, TPS3824-33-Q1 TPS3824-50-Q1, TPS3825-33-Q1, TPS3825-50-Q1, TPS3828-33-Q1, TPS3828-50-Q1 www.ti.com SGLS143C – DECEMBER 2002 – REVISED DECEMBER 2015 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The TPS382x-xx-Q1 family of devices are very small supervisory circuits that monitor fixed supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The TPS382x-xx-Q1 family operates from 1.1 V to 5.5 V. Orderable options include versions with either push-pull or open-drain outputs, versions that use active-high or active-low logic for output signals, versions with a manual reset pin, and versions with a watchdog timer. See the Device Comparison Table for an overview of device options. 9.2 Typical Applications 9.2.1 Supply Rail Monitoring with Watchdog Time-out and 200-ms Delay The TPS3823-xx-Q1 can be used to monitor the supply rail for devices such as microcontrollers. The downstream device is enabled by the TPS3823-xx-Q1 once the voltage on the supply pin (VDD) is above the internal threshold voltage (VIT– + VHYS). The downstream device is disabled by the TPS3823-xx-Q1 when VDD falls below the threshold voltage minus the hysteresis voltage (VIT–). The TPS3823-xx-Q1 also issues a reset signal if the WDI input is not periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, ttout, RESET becomes active for the time period td. Some applications require a shorter reset signal than the 200 ms that most of the TPS382x-xx-Q1 family provide. In these cases, the TPS3820-xx-Q1is a good choice because it has a delay time of only 25 ms. If an open-drain output is needed, replace the TPS3823-xx-Q1 with the TPS3828-xx-Q1 (if the WDI input must be active while RESET is low, see Decoupling WDI During Reset Event). Figure 9 shows the TPS3823-33-Q1 in a typical application. Figure 9. Supply Rail Monitoring With Watchdog Time-out 9.2.1.1 Design Requirements The TPS3823-33-Q1 must drive the enable pin of a MSP430C325 using a logic-high signal to signify that the supply voltage is above the minimum operating voltage of the device and monitor the I/O pin to determine if the microcontroller is operating correctly. Copyright © 2002–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS3820-33-Q1 TPS3820-50-Q1 TPS3823-25-Q1 TPS3823-30-Q1 TPS3823-33-Q1 TPS3823- 50-Q1 TPS3824-30-Q1 TPS3824-33-Q1 TPS3824-50-Q1 TPS3825-33-Q1 TPS3825-50-Q1 TPS3828-33-Q1 TPS3828-50-Q1 |
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