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TPS3600D50PWRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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TPS3600D50PWRG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 26 page TPS3600D20, TPS3600D25, TPS3600D33, TPS3600D50 BATTERY BACKUP SUPERVISORS FOR LOW POWER PROCESSORS SLVS336B − DECEMBER 2000 − REVISED JANUARY 2007 9 detailed description (continued) manual switchover (MSWITCH) While operating in the normal mode from VDD, the device can be manually forced to operate in the battery-backup mode by connecting MSWITCH to VDD. The table below shows the different switchover modes. MSWITCH STATUS VDD mode GND VDD mode VDD mode VDD Switch to battery-backup mode Battery-backup mode GND Battery-backup mode Battery-backup mode VDD Battery-backup mode If the manual switchover feature is not used, MSWITCH must be connected to ground. watchdog In a microprocessor- or DSP-based system, it is not only important to supervise the supply voltage, it is also important to ensure the correct program execution. The task of a watchdog is to ensure that the program is not stalled in an indefinite loop. The microprocessor, microcontroller, or the DSP have to toggle the watchdog input within typically 0.8 s to avoid a time-out from occurring. Either a low-to-high or a high-to-low transition resets the internal watchdog timer. If the input is unconnected the watchdog is disabled and will be retriggered internally. saving current while using the watchdog The watchdog input is internally driven low during the first 7/8 of the watchdog time-out period, then momentarily pulses high, resetting the watchdog counter. For minimum watchdog input current (minimum overall power consumption), leave WDI low for the majority of the watchdog time-out period, pulsing it low-high-low once within 7/8 of the watchdog time-out period to reset the watchdog timer. If instead, WDI is externally driven high for the majority of the time-out period, a current of e.g. 5 V/40 k Ω ≈ 125 µA can flow into WDI. VIT WDI RESET td td t(tout) VOUT td Undefined Figure 4. Watchdog Timing www.ti.com |
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