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參數(shù)資料
| 型號(hào)： | TPS3306-20DGKRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 13/17頁(yè) |
| 文件大?。?/td> | 462K |
| 代理商： | TPS3306-20DGKRG4 |
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Saving Current While Using the Watchdog
td
t(tout)
VDD
VIT
WDI
RESET
t
Power-Fail Comparator (PFI and PFO)
PFI
PFO
VCC
GND
TPS3306
V(SENSE)
R1
1%
R2
1%
VPFI,trip = 1.25 V ×
R1 + R2
R2
SLVS290C – APRIL 2000 – REVISED DECEMBER 2006
DETAILED DESCRIPTION (continued)
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 5 V/40 k
= 125 A can flow into WDI.
Figure 1. Watchdog Timing
An additional comparator is provided to monitor voltages other than the nominal supply voltage. The
power-fail-input (PFI) will be compared with an internal voltage reference of 1.25 V. If the input voltage falls
below the power-fail threshold (VPFI) of typ. 1.25 V, the power-fail output (PFO) goes low. If it goes above 1.25 V
plus about 10 mV hysteresis, the output returns to high. By connecting two external resistors, it is possible to
supervise any voltages above 1.25 V. The sum of both resistors should be about 1 M
, to minimize power
consumption and also to assure that the current in the PFI pin can be neglected compared with the current
through the resistor network. The tolerance of the external resistors should be not more than 1% to ensure
minimal variation of sensed voltage. If the power-fail comparator is unused, connect PFI to ground and leave
PFO unconnected.
5
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS3306-20DKG | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
| TPS3306-20DKGR | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog IC |
| TPS3306-20DR | 功能描述:監(jiān)控電路 Dual-Processor with Power-Fail RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3306-20DRG4 | 功能描述:監(jiān)控電路 Dual-Processor with Power-Fail RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3306-20-Q1 | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER FAIL |
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