Cypress Semiconductor AN2309, Application Note

Page: 13 / 21

AN2309
November 25, 2007 Document No. 001-17394 Rev. *B - 13 -
Figure 9. Two-Cell Battery Charger Firmware Flowchart Part 1
Start
Init Device
Measure V
b1
, V
b2
,
I
ch
, T
b
Calc V
bmin
, V
bmax
State
Activation
Set I
reg
=I
ACT
;
Regulate
State
Initialization
Yes
Set Activation
State
Charge On
Start t
ACT
, t
CH
, Timing
Open LOAD Out
Yes
No
Check For
Timeouts
Set Error State
And Error Code
Check Rapid
Start Condition
V
bmin
>=V
RS
Set Rapid State
Start t
RAP
Time
Counter
Yes
Yes
No
State
Rapid
No
Set I
reg
=I
RAP
;
V
reg
=V
RAP
;
Regulate
Yes
Check For
Timeouts
Set Error State
And Error Code
Yes
No
Check Charge
Terminate
Condition
Set Charge
Complete State
Yes
No
Set Initialization
State
No
No
Send Debug Data
Check Cell
Balancing
Interval
Cell Balancing
Yes
No
Check Cell
Balancing
Interval
Cell Balancing
Yes
No
1 2
Check For
Negative Ich
Yes
No
State is not
Error or
Wait For
Temperature
Yes
No
Check For
Discharge Stop
Temperature
Set Wait For
Temperature State
Yes
No
Check Full
Discharge
Condition
Set Full Discharge
State
Yes
No
Set Full Discharge
State
Check for
charge stop
temperature
Yes
No
Set Wait For
Temperature state
Check For
Current Error
I
ch
>=I
MAX
Set Error State
And Error Code
Yes
No
Check For
Voltage Error
V
bmax
>=V
MAX
Set Error State
And Error Code
Yes
No
[+] Feedback