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| LP3913 Datasheet, PDF (25/70 Pages) Texas Instruments – Power Management IC for Flash Memory-Based Portable Media Players | |||
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LP3913
www.ti.com
SNVS489I â NOVEMBER 2006 â REVISED SEPTEMBER 2013
FUNCTIONAL DESCRIPTION
Operating Modes
The LP3913 can be in 3 different operating modes as illustrated in Figure 53:
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 53. Operating Mode State Diagram
State Machine Definitions
VBLA Battery low alarm threshold
VBATT Battery voltage
WA Wall Adapter
USB Universal Serial Bus Adapter
ONOFF On off pin event
POWERACK Acknowledgment from the Host Processor
Copyright © 2006â2013, Texas Instruments Incorporated
Product Folder Links: LP3913
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