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LP3971 Datasheet(PDF) 24 Page - Texas Instruments

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Part # LP3971
Description  Power Management Unit for Advanced Application Processors
PDF  52 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP3971 Datasheet(HTML) 24 Page - Texas Instruments

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LP3971
SNVS432V – JANUARY 2006 – REVISED MAY 2013
www.ti.com
SYSTEM CONTROL REGISTER 1 (SCR1) 8H'07
Bit
7
6
5
4
3
2
1
0
Designation
BPSEN
Reserved
SENDL**
FPWM3
FPWM2
FPWM1
ECEN
Reset Value
0
1
1**
0**
0
0
0
0
SYSTEM CONTROL REGISTER 1 (SCR1) 8H'07 DEFINITIONS
Bit
Access
Name
Description
7
R/W
BPSEN
Bypass System enable safety Lock. Prevents activation of PWR_EN when SYS_EN is low.
0 = PWR_EN “AND” with SYS_EN signal
1 = PWR_EN independent of SYS_EN
6
—
—
Reserved
5:4
R/W
SENDL
Delay time for High Voltage Power Domains LDO2, LDO3, LDO4, Buck2, and Buck3 after activation
of SYS_EN. VCC_LDO1 has no delay.
Data Code
Delay mS
Notes
2h'0
0.0
2h'1
0.5
2h'2
1.0
Default
2h'3
1.4
3
R/W
FPWM3
Buck 3 PWM/PFM Mode Select
0 - Auto Switch between PFM and PWM operation
1 - PWM Mode Only will not switch to PFM
2
R/W
FPWM2
Buck 2 PWM/PFM Mode Select
0 - Auto Switch between PFM and PWM operation
1 - PWM Mode Only will not switch to PFM
1
R/W
FPWM1
Buck 1 PWM/PFM Mode Select
0 - Auto Switch between PFM and PWM operation
1 - PWM Mode Only will not switch to PFM
0
R/W
ECEN
External Clock Select
0 = Internal Oscillator clock for Buck Converters
1 = External 13 MHz Oscillator clock for Buck Converters
BACKUP BATTERY CHARGER CONTROL REGISTER (BBCC) 8H'0B
Bit
7
6
5
4
3
2
1
0
Designation
NBUB
CNBFL
nBFLT
BUCEN
IBUC
Reset Value
0
0
0
1
0
0
0
1
BACKUP BATTERY CHARGER CONTROL REGISTER (BBCC) 8H'0B DEFINITIONS
Bit
Access
Name
Description
7
R/W
NBUB
No back-up battery default setting. Logic will not allow switch over to back-up
battery.
0 = Back up Battery Enabled
1 = Back up Battery Disabled
6
---
---
Reserved
5:3
R/W
BFLT
nBATT_FLT monitors the battery voltage and can be set to the De-assert
voltages listed below.
Data Code
Asserted
De-Asserted
3h'00
2.4
2.6
3h'01
2.6
2.8
3h'02
2.8
3.0
3h'03
3.0
3.2
3h'04
3.2
3.4
3h'05
3.4
3.6
24
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Copyright © 2006–2013, Texas Instruments Incorporated
Product Folder Links: LP3971



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