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參數(shù)資料
| 型號(hào)： | LP3972SQXE514 |
| 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 |
| 文件頁數(shù)： | 44/60頁 |
| 文件大?。?/td> | 1171K |
| 代理商： | LP3972SQXE514 |
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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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3972SQX-E514 | 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-E514/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 |
| LP3972SQX-I414/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 |
| LP3972SQX-I514 | 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-I514/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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