Datasheet

StartPrecharge
CHG
= Low
Batteryshortdetected ?
Yes
No
No
t
PRECHARGE
Elapsed?
BeginCharging
EndCharge
Flash/CHG
I
BAT
< I
TERM
Yes
Yes
TD = Low
(’72, ’73 Only )
(
’74, ’75 = YES
)
No
TerminationReached
BATTFET Off
WaitforV
BAT
< V
RCH
Yes
No
V
BAT
> V
LOWV
StartFastcharge
I
CHARGE
setbyISET
No
EndCharge
Flash CHG
No
t
FASTCHARGE
Elapsed?
ChargeDone
CHG
= Hi-Z
V
BAT
< V
RCH
No
BatteryDetected ?
RunBatteryDetection
Yes
Yes
No
bq24230
bq24232
SLUS821E –OCTOBER 2008–REVISED JANUARY 2014 www.ti.com
Figure 29. Battery Charging Flow Diagram
Charge Current Translator
When the charger is enabled, internal circuits generate a current proportional to the charge current at the ISET
input. The current out of ISET is 1/400 (±10%) of the charge current. This current, when applied to the external
charge current programming resistor, R
ISET
, generates an analog voltage that can be monitored by an external
host to calculate the current sourced from BAT.
V
ISET
=(I
CHARGE
/ 400)×R
ISET
(2)
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