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參數(shù)資料
| 型號： | LP3971SQX-A514 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS |
| 中文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC40 |
| 封裝： | 5 X 5 MM, LLP-40 |
| 文件頁數(shù)： | 34/42頁 |
| 文件大?。?/td> | 1350K |
| 代理商： | LP3971SQX-A514 |
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LP3971 Controls
(Continued)
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).
LP3971 also has an internal Thermal Shutdown early warn-
ing that generates a wakeup to the system also. This is
generated usually at 125C.
20180719
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 main battery re-
moved or voltage too low, LP3971 uses Back-Up Battery for
generating LDO_RTC voltage. When Main Battery is avail-
able the battery switch changes main battery for LDO_RTC
voltage. When Main battery voltage is too low or removed
nBATT_FLT is asserted to system acknowledge. 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 termination
voltage via I
2
C compatible interface. Enabling of back up
battery
charger
can
be
(nBAT_CHG_EN)
or
external
(nCHG_EN). Pin 29 is set as external charger enable input
by default.
done
via
serial
interface
enable
charger
pin
L
www.national.com
34
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP3971SQX-B410 | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| LP3971SQX-B410/NOPB | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| LP3971SQX-B510/NOPB | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| LP3971SQX-D510 | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| LP3971SQX-D510/NOPB | 功能描述:PMIC 解決方案 RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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