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| 型號： | TPS3600x20PW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| 中文描述： | 電池備份監(jiān)事的低功耗處理器 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 510K |
| 代理商： | TPS3600X20PW |
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SLVS336B DECEMBER 2000 REVISED JANUARY 2007
9
detailed description (continued)
manual switchover (MSWITCH)
While operating in the normal mode from V
DD
, the device can be manually forced to operate in the
battery-backup mode by connecting MSWITCH to V
DD
. The table below shows the different switchover modes.
MSWITCH
GND
STATUS
VDD mode
VDD mode
Switch to battery-backup mode
VDD
GND
VDD
Battery-backup mode
Battery-backup mode
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
≈
125
μ
A can flow into WDI.
VIT
WDI
RESET
td
td
t(tout)
VOUT
td
Undefined
Figure 4. Watchdog Timing
www.ti.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS3600x20PWR | BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600x25PW | BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600x25PWR | BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600x33PW | BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600x33PWR | BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS3600X20PWR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600X25PW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600X25PWR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600X33PW | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
| TPS3600X33PWR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS |
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