LP3910 Datasheet, PDF (53/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players

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LP3910
SNVS481M – NOVEMBER 2006 – REVISED DECEMBER 2015
8.6 Register Maps
8.6.1 LDO1 Control Register
LDO1 can be configured through its own I²C control register. The output voltage is programmable in steps of 100
mV from 1.2 V to 3.3 V. LDO1 gets enabled during the power-on sequence. Disable/enable control is provided
through bit D5 in the LDO1 control register after selecting the appropriate D4–0 settings, which determine the
output voltage.
The output voltage can be altered while LDO1 is enabled. When LDO1 is disabled, it shunts the output to AGND
with a R_SHUNT = 200 Ω (maximum).
8.6.2 BATTLOW Register (04)H Battery Low Alarm Register
Access
Data
D7–5
Read Only 0
Reserved
Reset
Standard
Default
n/a
“AP” Default
Battery low threshold voltage (V)
5’h14–1F
2.50
5’h13
2.55
5’h12
2.60
5’h11
2.65
5’h10
2.70
5’h0F
2.75
5’h0E
2.80
5’h0D
2.85
5'h0C
2.90
5’h0B
2.95
5’h0A
3.00
5’h09
3.05
5’h08
3.10
5’h07
3.15
5’h06
3.20
5’h05
3.25
5’h04
3.30
5’h03
3.35
5’h02
3.40
5’h01
3.45
5’h00
3.50
5’h0C
2.90
5’h1F
2.70
D4–0
R/W
Battery low IRQ threshold voltage (V)
2.70
2.75
2.80
2.85
2.90
2.95
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
3.55
3.60
3.65
3.70
3.10
2.70
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