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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)： | 37/42頁 |
| 文件大?。?/td> | 1350K |
| 代理商： | LP3971SQX-A514 |
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Application Note
(Continued)
Typical Application Diagram with PXA27x Advanced Applications Processor Version “B”
20180721
LP3971 & PXA27x START-UP
Initial Cold Start Power On Sequence
1.
The Back up battery is connected to the PMU, power is
applied to the back-up battery pin, the RTC_LDO turns
on and supplies a stable output voltage to the
VCC_BATT pin of the Applications processor (initiating
the power-on reset event) with nRSTO asserted from the
LP3971 to the processor.
2.
The Applications processor waits for the de-assertion of
nBATT_FLT to indicate system power (V
IN
) is available.
3.
IF system power (V
bat
) is avaliable, the LP3971 de-
asserts nBATT_FLT.
4.
nRSTO de-asserts after a minimum of 50 mS.
5.
The Applications processor asserts SYS_EN, the
LP3971 enables the system high-voltage power sup-
plies. The Applications processor starts its countdown
timer set to 125 mS.
The LP3971 enables the high-voltage power supplies.
-LDO1 power for VCC_MVT, BG, OSC13M and PLL
enabled first, followed by others if delay is on.
Countdown timer expires; the Applications processor
asserts PWR_EN (ext. pin or I
2
C) to enable the low-
voltage power supplies. The processor starts the count-
down timer set to 125 mS period.
TheApplications processor asserts PWR_EN (ext. pin or
I
2
C), the LP3971 enables the low-voltage regulators.
Countdown timer expires; If enabled power domains are
OK (I
2
C read) the power up sequence continues by
enabling the processors 13 MHz oscillator and PLL’s.
10. The Applications processor begins the execution of
code.
6.
7.
8.
9.
L
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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(fēng)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(fēng)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(fēng)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(fēng)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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