PS810 datasheet(31/46 Pages) MICROCHIP

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DS21904C-page 31

PS810

9.0

PARAMETER SETUP

This section documents all of the programmable

parameters that are resident in the memory.

TABLE 9-1:

ALPHABETICAL LISTING OF PARAMETERS

Parameter

Name

# Bytes

Units

Typical

Value

Operational Description

AgeFactor

0.125 mV

Scale factor for EOD voltages due to aging. In units of

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

AOMInterval

op cycles

Interval between auto-offset calibrations.

AVGIScale

coded

b00100000

Time period over which current is averaged to calculate

average current, IAVG = IAVG + (I – IAVG)/AVGIScale.

Note:

Only Most Significant set bit is used, others are

ignored.

1xxxxxxx

: IAVG = IAVG + (I – IAVG)/256

01xxxxxx

: IAVG = IAVG + (I – IAVG)/128

001xxxxx

: IAVG = IAVG + (I – IAVG)/64

0001xxxx

: IAVG = IAVG + (I – IAVG)/32

00001xxx

: IAVG = IAVG + (I – IAVG)/16

000001xx

: IAVG = IAVG + (I – IAVG)/8

0000001x

: IAVG = IAVG + (I – IAVG)/4

00000001

: IAVG = IAVG + (I – IAVG)/2

BGCal

integer

Band gap voltage calibration factor.

CalStatus

bitmap

b11111111

Bit coded as follows:

Bit

Function

7RCOSC

6TEMP

CURRENT

4VC1

3VCOIN

= Not calibrated

= Calibrated

CFCoin

integer

2250

Correction Factor for Coin Cell Voltage.

CFCurr

integer

4200

Correction Factor for Current. Adjusts the scaling of the

sense resistor current measurements.

CFTempE

integer

326

Correction Factor for Temperature. Adjusts the scaling of

temperature measured across an external thermistor at the

NTC input pin.

CFTempI

integer

2038

Correction Factor for Temperature. Adjusts the scaling of

temperature measured from the internal temperature sensor.

CFVoltage

integer

2250

Correction Factor for Pack Voltage. Adjusts the scaling of the

pack voltage measurements. Used to calibrate the measure-

ment of pack voltage between VC1 input pin and ground.

ClrFullyChrg

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

When discharging begins, the FULLY_CHARGED bit should

remain set until the cell voltages are below EOCVolt, so that

a small current will not trigger a false End-Of-Charge trigger.

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%.

COCurr

signed byte

Correction Offset for Current. This is the value the A/D reads

when zero current is flowing through the sense resistor.

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