LP3971SQ-2G16/NOPB National Semiconductor, LP3971SQ-2G16/NOPB Datasheet - Page 28

• Manufacturer Part Number: LP3971SQ-2G16/NOPB
• Description: IC PMU FOR APPL PROCESSORS 40LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3971SQ-2G16/NOPB

• Applications: Processor
• Current - Supply: 60µA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LP3971SQ-2G16; LP3971SQ-2G16; LP3971SQ-2G16TR

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Designation
Reset Value
SYSTEM CONTROL REGISTER (SCR2) 8H'0E
Note: ** denotes EPROM programmable registers for default value.
SYSTEM CONTROL REGISTER (SCR2) 8H'0E DEFINITIONS
Bit
3:2
1:0
7
6
5
4
Access
Bit
R/W
R/W
R/W
R/W
R/W
R/W
WUP3_
GPIO2
GPIO1
Name
BBCS
BPTR
sense
SEB2
BBCS
7
1
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
PWR_EN soft Low voltage Supply Enabled OR'ed with PWR_EN Pin
0 = Low voltage Supply Output Enabled
1 = Low voltage Supply Output Disabled
Bypass RTC_LDO Output Voltage to LDO1 Output Voltage Tracking
0 = RTC_LDO1 Tracking enabled
1 = RTC-LDO1 Tracking disabled
Spare Wakeup control input
0 = Active High
1 = Active Low
Configure direction and output sense of GPIO2 Pin
Configure direction and output sense of GPIO1 Pin
Data Code
Data Code
2h'00
2h'01
2h'02
2h'03
2h'00
2h'01
2h'02
2h'03
SEB2
6
0
GPIO2
Hi-Z
Output Low
Input
Output high
GPIO1
Hi-Z
Output Low
Input
Output high
BPTR**
28
0**
5
Description
WUP3_
sense
4
1
3
0
GPIO2
2
0
1
0
GPIO1
0
0