BQ25040 Datasheet, PDF (14/25 Pages) Texas Instruments – 1.1A, Single-Input, Single Cell Li-Ion Battery Charger With 50mA LDO and 2.3A Production Test Support

bq25040
SLUS910B – MARCH 2009 – REVISED MARCH 2009 ...................................................................................................................................................... www.ti.com
Any
State
IC Enabled
IC Disabled
EN/SET
Rising Edge
NO
Detected?
YES
Begin 1.5ms OFF
Timer
Falling Edge NO
Detected?
NO
Has 1.5ms OFF
Timer Expired?
YES Disable IC
Turn off Charge
CHG = Hi-Z
Increment Pulse
Counter
Go to IC Disabled
Routine
EN/SET = 0?
NO
YES
USB500 Mode
ICHARGE = 395mA
Begin Battery
Charging
Is Pulse Counter
> 3?
YES
USB100 Mode
ICHARGE = 100mA
NO
Begin 1.5ms
LATCH Timer
EN/SET
Rising Edge
NO
Detected?
YES
NO
Has 1.5ms
LATCH Timer
Expired?
YES
Send Pulse
Counter Info to
Decode Block
# PULSE = 1?
YES
User Program
Mode
ICHARGE = ISET
NO
# PULSE = 2?
YES USB100 Mode
ICHARGE = 100mA
NO
PTM Enabled
VOUT = 4.2V
IIN(LIMIT) > 2.3A
Figure 23. EN/SET State Diagram
14
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