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7.4.4. Setting BCIISF Parameters
The charging current calibration requires measuring the current at 2 levels and determining the
adc_num and adc_offset based on the physical currents (Iphy) and reported charging currents
(Ichg_avg_mA). Two points are required to get accurate calibrations at both the high and low current
levels.
7.4.5. Scope
This calibration does not need to be done as part of a factory level production test on every device,
default values can be used to get ballpark readings. Customer level calibration is required if the
battery charge current and end-of-charge current are critical.
7.4.6. 6.2 Equipment required
1. Battery simulator, or mostly discharged battery.
2. Power supply with capability to measure current, 5-12V, 1A, to emulate wall charger. Agilent
3. A notebook or desktop computer with any version of Microsoft Windows that has the HyperTerminal
communications program. If this hardware is not available, the user could use a DOS terminal
emulation program.
7.4.7. 6.3 Calibration procedure
Step
Action
1
Turn off
automatic
registration
2
Normalize
slope and
offset.
3
Set voltage
averaging to
0. Note
original value
for later.
4
Verify
charging state
4(LCI) and
charger #.
5
Set charging
current, low
6
Cycle
charging so
charge
current will
take effect.
7
Measure
power supply
current
8
Record
reported Ichg,
after update.
9
Set charging
current, high
10
Cycle
LPP0108IG001
Command
AT+CFUN=0
AT$AREG=0
AT$BCIISF=800,0
AT$BCIAVG=5,5,0,10000
AT$BAT= 40,1,#,4,3956,839
Note: # must be 2,3,4, or 5.
Assumed 2 for the remainder of this
procedure
AT$BCICHG2=
3,4
1,32,7450,4725,5725
AT$BCIOFF=1
AT$BCIOFF=0
AT$BAT=
40,1,2,4,3956,<Ichg1>
AT$BCICHG2=
3,4
1,250,6050,4725,5725
AT$BCIOFF=1
40
Power supply
V
=3.700V
PS
V
=5.000V
BATSIM
Read I
BATSIM
current.
Version - Preliminary – 06/20/08
Calculation
Iphy1
Ichg1
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