參數(shù)資料
型號: LP3972
廠商: National Semiconductor Corporation
英文描述: Power Management Unit for Advanced Application Processors
中文描述: 電源管理單元的高級應用處理器
文件頁數(shù): 38/59頁
文件大?。?/td> 1072K
代理商: LP3972
I
2
C Compatible Interface
(Continued)
SYSTEM CONTROL REGISTER 2 (SCR2)
System Control Register 2 (SCR2) 8h’81
Bit
7
6
5**
BPTR
1
4
3
2
1
0
Designation
Reset Value
Note:
** denotes one time factory programmable EPROM registers for default values
BBCS
1
SHBU
0
WUP3
1
GPIO2
GPIO1
0
0
1
0
System Control Register 2 (SCR2) 8h’81 Definitions
Bit
7
Access
R/W
Name
BBCS
Description
Sets GPIO1 as control input for Back Up battery charger
0 - Back Up battery Charger GPIO Disabled
1 - Back Up battery Charger GPIO Pin Enabled
Shut down Back up battery to prevent battery drain during
shipping
0 = Back up Battery Enabled
1 = Back up battery Disabled
Bypass RTC_LDO Output Voltage to LDO 3 Output Voltage
Tracking
0 - RTC-LDO 3 Tracking enabled
1 - RTC-LDO 3 Tracking disabled, Default
Spare Wakeup control input
0 - Active High
1 - Active Low
Configure direction and output sense of GPIO2 Pin
Data Code
2h’00
2h’01
2h’02
2h’03
Output high
Configure direction and output sense of GPIO1 Pin
Data Code
2h’00
2h’01
2h’02
2h’03
Output high
6
R/W
SHBU
5
R/W
BPTR
4
R/W
WUP3
3:2
R/W
GPIO2
GPIO2
Hi-Z
Output Low
Input
1:0
R/W
GPIO1
GPIO1
Hi-Z
Output Low
Input
L
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