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)： 43/60頁
文件大小： 1171K
代理商： LP3972SQXE514
LP3972 Controls
DIGITAL INTERFACE CONTROL SIGNALS
Signal
Definition
Active State
Signal Direction
SYS_EN
High Voltage Power Enable
High
Input
PWR_EN
Low Voltage Power Enable
High
Input
SCL
Serial Bus Clock Line
Clock
Input
SDA
Serial Bus Data Line
Bidirectional
nRSTI
Forces an unconditional hardware reset
Low
Input
nRSTO
Forces an unconditional hardware reset
Low
Output
nBATT_FLT
Main Battery removed or discharged indicator
Low
Output
PWR_ON
Wakeup Input to CPU
High
Input
nTEST_JIG
Wakeup Input to CPU
Low
Input
SPARE
Wakeup Input to CPU
High/Low
Input
EXT_WAKEUP
Wake-Up Output for application processor
High
Output
GPIO1 / nCHG_EN
General Purpose I/O /External Back-up Battery Charger enable
—
Bidirectional /Input
GPIO2
General Purpose I/O
—
Bidirectional
POWER DOMAIN ENABLES
PMU Output
HW Enable
SW Enable
LDO_RTC
—
LDO1 (V
CC_MVT)
SYS_EN
LDO1_EN
LDO2
SYS_EN
LDO2_EN
LDO3
SYS_EN
LDO3_EN
LDO4
SYS_EN
LDO4_EN
PMU Output
HW Enable
SW Enable
LDO5 (V
CC_SRAM)
PWR_EN
S_EN
Buck1 (V
CC_APPS)
PWR_EN
A_EN
BUCK2
SYS_EN
B2_EN
BUCK3
SYS_EN
B3_EN
POWER DOMAINS SEQUENCING (DELAY)
By default SYS_EN must be on to have PWR_EN enable but
this feature can be switched off by register bit BP_SYS.
By default SYS_EN enables LDO1 always first and after a
typical of 1 ms delay others. Also when SYS_EN is set off the
LDO1 will go off last. This function can be switched off or delay
can be changed by DELAY bits via serial interface as seen
on table below.
8h’80 Bit 5:4
DELAY bits
‘00’
‘01’
‘10’
‘11’
Delay, ms
0
0.5
1.0
1.5
LDO_RTC TRACKING (nIO_TRACK)
LP3972 has a tracking function (nIO_TRACK). When en-
abled, LDO_RTC voltage will track LDO3 voltage within 200
mV down to 2.8V when LDO3 is enabled. This function can
be switched on/off by nIO_TRACK register bit BPTR.
POWER SUPPLY ENABLE
SYS_EN and PWR_EN can be changed by programmable
register bits.
www.national.com
48
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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