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| LP3910 Datasheet, PDF (44/72 Pages) Texas Instruments – Power Management IC for Hard-Drive-Based Portable Media Players | |||
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LP3910
SNVS481M â NOVEMBER 2006 â REVISED DECEMBER 2015
Device Functional Modes (continued)
www.ti.com
BATTERY INSERT VBATT> VBLA
POWER OFF
No Battery
BATTERY INSERT VBATT < VBLA
POWERACK PIN AND BIT = 0
NO WA / USB
STANDBY
WA AND USB REMOVED
ONOFF AND
VBATT > VBLA
ACTIVE
WA INSERT
USB INSERT
AND VBATT > VBLA
(CHARGING IF NEEDED)
POWERACK PIN OR BIT = 1
VBATT < VBLA AND NO WA
ONOFF
WA OR USB
POWERACK PIN AND BIT
FAILED TO GO HIGH DURING
POWERUP SEQUENCE
CHG
STANDBY
WA OR USB
Figure 64. Operating Mode State Diagram
8.4.1 State Machine Definitions
VBLA
VBATT
WA
Battery low alarm threshold
Battery voltage
Wall Adapter
USB
Universal Serial Bus Adapter
ONOFF On off pin event
POWERACK Acknowledgment from the Host Processor
44
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