LP3971SQ-2G16/NOPB National Semiconductor, LP3971SQ-2G16/NOPB Datasheet - Page 27

• 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

Designation
Reset Value
BACKUP BATTERY CHARGER CONTROL REGISTER (BBCC) 8H'0B
BACKUP BATTERY CHARGER CONTROL REGISTER (BBCC) 8H'0B DEFINITIONS
Bit
5:3
1:0
7
6
2
Bit
Access
R/W
R/W
R/W
R/W
---
NBUB
BUCEN
7
0
Name
NBUB
BFLT
IBUC
---
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
Reserved
nBATT_FLT monitors the battery voltage and can be set to the De-assert
voltages listed below.
Enables backup battery charger
0 = Back up Battery Charger Disabled
1 = Back up Battery Charger Enabled
Charger current setting for back-up battery
CNBFL
6
0
Data Code
3h'00
3h'01
3h'02
3h'03
3h'04
3h'05
27
Data Code
2h'01
2h'00
2h'02
2h'03
5
0
nBFLT
4
1
Description
Asserted
3
0
2.4
2.6
2.8
3.0
3.2
3.4
BUCEN
BU Charger I (µA)
2
0
260
190
325
390
De-Asserted
www.national.com
2.6
2.8
3.0
3.2
3.4
3.6
1
0
IBUC
0
1