PS810 datasheet(17/46 Pages) MICROCHIP

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DS21904C-page 17

PS810

FLAGS1

bitmap

b00100000 Bit coded as follows:

Bit

Function

7Unused

6Unused

Int/Ext temperature

Disable Sleep in main Idle mode.

3Unused

Disable safety GPIO

1Unused

0Unused

RemCapDelta

1/4 mAh

Maximum change in remaining capacity per measurement

period.

EODRecheck

integer

Recheck period for EOD. Voltage must be below VEOD for this

many measurement periods.

ClrFullyDischrg

Reset FULLY_DISCHARGED bit, 100 = 100%. Once fully

discharged bit is set, it will stay set until capacity rises above

this value, typically 10%.

EODCap

mAh

100

Capacity remaining in battery at EOD. Remaining capacity is

loaded with EODCap at EOD.

FullCapacity

mAh

2200

Learned value of battery capacity. Used for battery data 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.

RLCycles

integer

The number of initial cycles without a relearn limit. Normally, full

charge capacity will change by a maximum of 256 mAh when

relearned. Since FullCapacity can vary greatly with the first

learning cycle, the initial capacity may not be correct; thus, this

should be set to at least 2.

TEOD

(°Celsius * 10

+ 200)/4

5, 20, 35,

50, 80,

113, 150

EOD temperature boundaries – 8 increasing values of

temperature coded as: TEODx = (°Celsius * 10 + 200)/4.

CEOD

1/64 C

19, 32, 48,

64, 77, 90,

109

EOD C-rate boundaries – 8 increasing values of C-rates coded

as: CEODx = C-rate * 64.

FCCP

255 = 100%

50, 25, 12,

8, 0, 0,

0, 0

Unusable residual capacity before save to disk, corresponding

to temperature, 255 = 100%.

VEODOffset

2700

Baseline for VEOD formula.

VEOD

voltage –

VEODOffset/4

End-Of-Discharge voltage, voltage = VEODOffset + 4 * VEOD.

Cell voltage at which save to disk is signaled.

AgeFactor

0.125 mV

Scale factor for EOD voltages due to aging (in units of .125 mV),

VEODaged = VEOD – (CycleCount * .125 * AgeFactor).

VEODCoin

2500

Voltage at which coin cell is determined to be empty.

TABLE 4-3:

CAPACITY MONITORING PARAMETERS (CONTINUED)

Parameter

Name

# of

Bytes

Units

Typical

Value

Operational Description

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