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LP3971 数据表(PDF) 33 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 LP3971
功能描述  POWER MANAGEMENT UNIT FOR ADVANCED APPLICATION PROCESSORS
PDF  42 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LP3971 数据表(HTML) 33 Page - National Semiconductor (TI)

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I
2C Register Definitions (Continued)
I
2C DVM TIMING FOR VCC APPS (Buck 1)
20180718
LP3971 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
-/Low
Bidirectional/Input
GPIO2
General Purpose I/O
-
Bidirectional
*
POWER DOMAIN ENABLES
PMU Output
HW Enable
SW Enable
LDO_RTC
-
-
LDO1
SYS_EN
LDO1_EN
LDO2
SYS_EN
LDO2_EN
LDO3
SYS_EN
LDO3_EN
LDO4
PWR_EN/SYS_EN
LDO4_EN
LDO5
PWR_EN/SYS_EN
LDO5_EN
BUCK1
PWR_EN
B1_EN
BUCK2
SYS_EN/PWR_EN
B2_EN
BUCK3
SYS_EN
B3_EN
LDO_RTC TRACKING (nIO_TRACK)
LP3971 has a tracking function (nIO_TRACK). When en-
abled, LDO_RTC voltage will track LDO1 voltage within 200
mV down to 2.8V when LDO1 is enabled. This function can
be switched on/off by BPTR (8h’0E) register bit.
LDO4, LDO5 AND BUCK 2 ENABLE SELECTION
(LDO4_ESEL, LDO5_ESEL AND BUCK2_ESEL)
LDO4, 5 and BUCK2 power domain enable is possible to
change between SYS_EN and PWR_EN by register bits.
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
2C compatible interface
www.national.com
33



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