參數(shù)資料
型號(hào)： LP3972
廠商： National Semiconductor Corporation
英文描述： Power Management Unit for Advanced Application Processors
中文描述： 電源管理單元的高級(jí)應(yīng)用處理器
文件頁(yè)數(shù)： 49/59頁(yè)
文件大?。?/td> 1072K
代理商： LP3972
LP3972 Controls
(Continued)
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 I
2
C compatible interface
to be active low or high (SPARE bit, Default is active low ‘1’).
A reason for wakeup event can be read through I
2
C compat-
ible interface also. Additionally wakeup inputs have 30 ms
de-bounce filtering. Furthermore PWR_ON have distinguish-
ing between short and long (
～
1s) pulses (push button input).
LP3972 also has an internal Thermal Shutdown early warn-
ing that generates a wakeup to the system also. This is
generated usually at 125C.
20207619
WAKEUP register bits
WUP0
WUP1
WUP2
WUP3
TSD_EW
Reason for WAKEUP
SPARE
TEST_JIG
PWR_ON short pulse
PWR_ON long pulse
TSD Early Warning
INTERNAL THERMAL SHUTDOWN PROCEDURE
Thermal shutdown is build to generate early warning (typ.
125C) which triggers the EXT_WAKEUP for the processor
acknowledge. When a thermal shutdown triggers (typ.
160C) 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
I
2
C 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.
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP3972_08 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Power Management Unit for Advanced Application Processors
LP3972SQ-0514/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
LP3972SQ-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
LP3972SQ-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
LP3972SQ-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
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