PS810 datasheet(16/46 Pages) MICROCHIP

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PS810

DS21904C-page 16

TABLE 4-3:

CAPACITY MONITORING PARAMETERS

Parameter

Name

# of

Bytes

Units

Typical

Value

Operational Description

DesignCapacity

mAh

2200

Battery data value for DesignCapacity. This is the first capacity

loaded into the FullChargeCapacity upon power-up.

RemCap

mAh

440

The initial capacity of the battery. When the PS810 is first

powered up and initialized, before a learning cycle takes place

to learn the full capacity, the full capacity will take the value

programmed into RemCap to compute relative

State-Of-Charge percentage.

NullCurr

A zero zone control is built into the PS810 so that any electrical

noise doesn’t actually drain the gas gauge, when in fact, the

current is zero. For this reason, current less than NullCurr mA

in either direction will be measured as zero.

PwrConsumption

1/256 mA

Current consumption of the battery module. This is the average

current that the battery module typically draws from the battery

(255 = 1 mA).

ClrFullyChrg

Reset FULLY_CHARGED bit at this level, 100 = 100%. When

discharging begins, the FULLY_CHARGED bit must remain set

until the cell voltages are below EOCVolt, so that a small

current will not trigger a false End-Of-Charge trigger. Thus,

ClrFullyChrg is set at about 90%. FULLY_CHARGED bit will

be on until the battery has discharged to less than 90%.

ConfigCAP

bitmap

11100100 bit 7:

Compensate remaining capacity – the displayed remaining

capacity actually equals FCC minus capacity used minus

residual capacity.

bit 6:

Remaining capacity decrease only – when compensating, if

temperature changed causing a decrease in residual capacity,

do not let remaining capacity rise to reflect this. Instead, hold it

steady until discharge catches up.

bit 5:

Only compensate on discharge.

bit 4:

Compensate on null current.

bit 3:

Unused.

bit 2:

Set capacity to positive immediately upon charging. If

discharged below zero, this allows capacity to count up

immediately upon charging.

bit 1:

Learn unconditionally – relearn FCC under any conditions.

Typically used for testing only.

bit 0:

Disable self-discharge.

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