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TPS3803-Q1 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS3803-Q1 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 25 page  _ + R1 R2 Reference Voltage of 1.215 V RESET VDD GND _ + Reference Voltage of 1.226 V RESET VDD GND SENSE Device Supply Voltage _ + _ + R1 R2 VDD GND Reference Voltage of 1.226 V SENSE RESET TPS3803G15-Q1 TPS3803-01-Q1 TPS3805H33-Q1 TPS3803-01-Q1 TPS3803G15-Q1, TPS3805H33-Q1 www.ti.com SGLS228C – DECEMBER 2003 – REVISED SEPTEMBER 2015 8 Detailed Description 8.1 Overview The TPS380x-Q1 devices are low-current supervisory circuits used to monitor system voltages above 1.226 V. The devices assert an active low RESET signal when VDD ,SENSE, or both voltages drop below a preset threshold. The RESET output remains low until the VDD, SENSE, or both voltages return above their thresholds. The devices are also designed to be immune to short negative transients on the VDD and SENSE pins. 8.2 Functional Block Diagrams 8.3 Feature Description 8.3.1 VDD and SENSE Monitoring The VDD and SENSE inputs provide a pin at which a system voltage can be monitored. If the voltage on this pin drops below VIT, RESET is asserted low. The comparator has a built-in hysteresis to ensure smooth RESET assertions and de-assertions. Refer to the Device Comparison Table to determine the VDD and SENSE voltage thresholds for each device. The adjustable version TPS3803-01-Q1 can be used to monitor any voltage rail down to 1.226 V using the circuit shown in Figure 13, where VIT' is the Vin threshold voltage. Copyright © 2003–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS3803-01-Q1 TPS3803G15-Q1 TPS3805H33-Q1 |
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