PS401-I/SS Microchip Technology, PS401-I/SS Datasheet - Page 27

• Manufacturer Part Number: PS401-I/SS
• Description: IC FUEL GAUGE BATTERY MGR 28SSOP
• Manufacturer: Microchip Technology

Specifications of PS401-I/SS

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TABLE 8-3:
 2003 Microchip Technology Inc.
ADLNearEmpty
ADLNearFull
EOD1Cap
EODRecheck
FullCapacity
NearEODErrReset OTP
NearEODRecheck OTP
RelearnCurrLim
RelearnLimit
RelearnMaxErr
RelearnVCell
RLCycles
VEOD1
VEOD2
Parameter
Name
EOD AND FCC RELEARN
Loc. # Bytes
OTP
OTP
OTP
OTP
OTP
OTP
EE
EE
EE
EE
EE
EE
1
1
2
1
2
2
1
2
1
2
2
1
2
2
Lower
Limit
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Upper
65535
65535
65535
65535
65535
65535
65535
65535
Limit
255
255
255
255
255
255
Typical
Value
4150
6000
3100
3000
122
205
200
200
6
0
6
0
6
2
SOC at which A/D switches to emphasize voltage
over current measurement near EOD. EE value of
128 = 100%.
SOC at which A/D switches to emphasize voltage
over current measurement near EOC. EE value of
128 = 100%.
The capacity that remains in the battery at VEOD1.
This is typically a small amount used to power a
shutdown sequence for the system.
Delay filter for the EOD condition. Number of
checks before EOD trigger. The end of discharge
conditions must remain for at least this number of
periods before being considered true, to help filter
out false empty conditions due to spikes.
Learned value of battery capacity. Used for SBData
value of FullChargeCapacity. This is a learned
parameter which is the equivalent of all charge
counted from fully charged to fully discharged,
including self-discharge and error terms. This is
reset after a learning cycle and used for remaining
capacity and relative state-of-charge calculations.
Near EOD error RESET.
Number of periods of valid pack voltage
measurements needed to trigger near EOD
capacity RESET.
Value of measured current that prevents a capacity
relearn from occurring when a terminate discharge
alarm condition is reached at End-Of-Discharge
(EOD). A learning cycle will happen when the
battery discharges from fully charged all the way to
fully discharged with no charging in between, and
the discharge current never exceeds
RelearnCurrLim. Example: 3000. A relearn will only
occur if current does not exceed 3000 mA.
The maximum relearn limit. The maximum
percentage that the FULL_CAPACITY can change
after a learning cycle, where 255 = 100%.
Maximum error for learning FullCapacity. The
FULL_CAPACITY will not be learned after a
learning cycle if the error is too great.
(Unused)
The number of initial cycles without RelearnLimit.
The initial number of cycles where RelearnLimit is
not active.
FullCapacity can vary more greatly with the first
learning cycle, since the initial capacity may not be
correct, thus this should be set to at least ‘2’.
First end-of-discharge voltage point. At this point,
capacity is set to S_CAP1, and FCC relearn takes
place.
Second and final end-of-discharge voltage point. At
this point, remaining capacity is optionally set to ‘0’.
Operational Description
DS40238B-page 27
PS401