PS501 datasheet(27/42 Pages) MICROCHIP

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 2004 Microchip Technology Inc.

DS21818C-page 27

PS501

TABLE 9-3:

EOD AND FCC RELEARN

Parameter

Name

Bytes

Lower

Limit

Upper

Limit

Typical

Value

Operational Description

ADLNearEmpty

65535

3600

Cell voltage at which A/D switches to emphasize voltage

over current measurement near EOD (mV).

ADLNearFull

65535

4000

Cell voltage at which A/D switches to emphasize voltage

over current measurement near EOC (mV).

EOD1Cap

65535

150

The capacity that remains in the battery at EOD1Voltage.

This is typically a small amount used to power a shutdown

sequence for the system.

EOD1Voltage

65535

3100

Voltage for EOD1 fixed voltage point (mV).

EOD1Recheck

255

Delay filter for the EOD1 condition. Number of checks before

EOD1 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. EOD1 condition is based on the Variable Voltage

Look-up Table or EOD1Voltage.

EOD2Recheck

255

Delay filter for EOD2 condition; EOD2 is based on Vempty.

FullCapacity

65535

4150

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.

RelearnCurrLim

65535

10,000

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.

RelearnLimit

255

205

The maximum relearn limit. The maximum percentage that

the FULL_CAPACITY can change after a learning cycle,

where 255 = 100%.

RelearnMaxErr

65535

300

Maximum error for learning FullCapacity. The

FULL_CAPACITY will not be learned after a learning cycle if

the error is too great.

RLCycles

255

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’.

Vempty

65535

3000

Second and final End-Of-Discharge voltage point. At this

point, remaining capacity is optionally set to ‘0’.

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