DS21915A-page 12
2004 Microchip Technology Inc.
MCP73853/55
Initialize
Note 1:
The qualification parameters are continuously
monitored throughout the charge cycle. For more
details on this, refer to
Section 4.1 “Charge
Qualification and Preconditioning”
.
The charge current will be scaled based on the
die temperature during thermal regulation. For
more details, refer to
Section 4.5 “Thermal
Regulation”
.
NOTE 1
Note 2:
V
DD
> V
UVLO
EN High
Yes
No
STAT1 = Off
STAT2 = Off
NOTE 1
Temperature OK
Yes
No
STAT1 = Off
STAT2 = Flashing
Charge Current = 0
STAT1 = On
STAT2 = Off
Preconditioning Mode
Charge Current = I
PREG
Reset Safety Timer
No
V
BAT
> V
PTH
Yes
Constant-current
NOTE 2
Mode
Charge Current = I
REG
Reset Safety Timer
V
BAT
> V
PTH
Yes
Constant-voltage Mode
Output Voltage = V
REG
V
BAT
= V
REG
No
Safety Timer
Expired
No
Yes
V
DD
< V
UVLO
or EN Low
No
STAT1 = Off
STAT2 = On
Yes
Yes
Fault
Charge Current = 0
Reset Safety Timer
Yes
No
Safety Timer
Expired
No
Yes
I
OUT
< I
TERM
Elapsed Timer
Expired
No
Yes
Temperature OK
Yes
Charge Termination
Charge Current = 0
Reset Safety Timer
V
DD
< V
UVLO
V
BAT
< V
RTH
or EN Low
Yes
No
STAT1 = Flashing
STAT2 = Off
Temperature OK
Temperature OK
No
STAT1 = Off
STAT2 = Flashing
Safety Timer Suspended
Charge Current = 0
No
STAT1 = Flashing
Safety Timer Suspended
Charge Current = 0
No
Yes
STAT1 = Off
STAT2 = Flashing
Safety Timer Suspended
Charge Current = 0
FIGURE 4-2:
Operational Flow Algorithm.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
