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TPS3707-33DRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS3707-33DRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page Reset Logic + Timer _ + _ + R1 R2 14 kΩ Reference Voltage of 1.25 V Watchdog Logic + Timer Oscillator 40 kΩ Transition Detection VDD MR GND PFI WDI RESET RESET PFO WDO Only TPS3705 Only TPS3707 Only TPS3705 TPS3705 TPS3707 Copyright © 2016, Texas Instruments Incorporated 11 TPS3705-30, TPS3705-33, TPS3705-50, TPS3707-30, TPS3707-50 www.ti.com SLVS184D – NOVEMBER 1998 – REVISED MAY 2016 Product Folder Links: TPS3705-30 TPS3705-33 TPS3705-50 TPS3707-30 TPS3707-50 Submit Documentation Feedback Copyright © 1998–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS370x-xx family of supervisors feature an integrated reference and comparator for VDD supervision, an additional power-fail supervisor, and a manual reset input. The TPS3705-xx devices feature a watchdog timer, where the TPS3707-xx devices feature a complimentary RESET output. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Manual Reset Input The TPS370x-xx devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active. 8.3.2 Power-Fail Comparator The TPS370x-xx family integrates a power-fail comparator which can be used for low-battery detection, power- fail warning, or for monitoring a power supply other than the main supply. 8.3.3 Watchdog Timer The TPS3705-xx devices have a watchdog timer that is periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the timeout interval, tt(out) = 1.6 s, WDO becomes active. This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. The TPS3707-xx devices do not have the watchdog function, but include a high-level output RESET. |
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