參數(shù)資料
型號(hào)： LP3972SQX-5810
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40
封裝： 5 X 5 MM, LLP-40
文件頁(yè)數(shù)： 44/60頁(yè)
文件大?。?/td> 1171K
代理商： LP3972SQX-5810
WAKE-UP FUNCTIONALITY (PWR_ON, nTEST_JIG,
SPARE AND EXT_WAKEUP)
Three input pins can be used to assert wakeup output for 10
ms for application processor notification to wakeup. SPARE
Input can be programmed through I2C compatible interface to
be active low or high (SPARE bit, Default is active low ‘1’). A
reason for wakeup event can be read through I2C compatible
interface also. Additionally wakeup inputs have 30 ms de-
bounce filtering. Furthermore PWR_ON have distinguishing
between short and long (
1s) pulses (push button input).
LP3972 also has an internal Thermal Shutdown early warning
that generates a wakeup to the system also. This is generated
usually at 125°C.
20207619
WAKEUP register bits
Reason for WAKEUP
WUP0
SPARE
WUP1
TEST_JIG
WUP2
PWR_ON short pulse
WUP3
PWR_ON long pulse
TSD_EW
TSD Early Warning
INTERNAL THERMAL SHUTDOWN PROCEDURE
Thermal shutdown is build to generate early warning (typ.
125°C) which triggers the EXT_WAKEUP for the processor
acknowledge. When a thermal shutdown triggers (typ. 160°
C) the PMU will reset the system until the device cools down.
BATTERY SWITCH AND BACK UP BATTERY CHARGER
When Back-Up battery is connected but the main battery has
been removed or its supply voltage too low, LP3972 uses
Back-Up Battery for generating LDO_RTC voltage. When
Main Battery is available the battery FET switches over to the
main battery for LDO_RTC voltage. When Main battery volt-
age is too low or removed nBATT_FLT is asserted. If no back
up battery exists, the battery switch to back up can be
switched off by nBU_BAT_EN bit. User can set the battery
fault determination voltage and battery charger current via
I2C compatible interface. Enabling of back up battery charger
can be done via serial interface (nBAT_CHG_EN) or external
charger enable pin (nCHG_EN). Pin 29 is set as external
charger enable input by default.
49
www.national.com
LP3972
相關(guān)PDF資料
PDF描述
LP3972SQXA514 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40
LP3972SQ-5810 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40
LP3972SQXE514 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40
LPB48DP 2-OUTPUT 75 W DC-DC REG PWR SUPPLY MODULE
LPB24DP 2-OUTPUT 75 W DC-DC REG PWR SUPPLY MODULE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP3972SQX-5810/NOPB 功能描述:監(jiān)控電路 Pwr Mgmt Unit 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
LP3972SQXA413 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power Management Unit for Advanced Application Processors
LP3972SQX-A413 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
LP3972SQX-A413/NOPB 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
LP3972SQXA514 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power Management Unit for Advanced Application Processors
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