PS501 datasheet(33/42 Pages) MICROCHIP

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 2004 Microchip Technology Inc.

DS21818C-page 33

PS501

TABLE 9-7:

CALIBRATION

Parameter

Name

Bytes

Lower

Limit

Upper

Limit

Typical

Value

Operational Description

CalStatus

255

b10000000 Bit coded as follows:

Bit

Function

Factory calibrated

EE/Flash downloaded

RC oscillator

External temperature

Internal temperature

Current

Pack voltage

Cell voltages

= Not Calibrated

= Calibrated

CFCurr

65535

6844

Correction Factor for Current. Adjusts the scaling of the

sense resistor current measurements. Used to calibrate

the measurement of current at the RSHP and RSHN input

pins. This is set for the size of the current sense resistor.

CFTempE

65535

1300

Correction Factor for Temperature. Adjusts the scaling of

temperature measured across an external thermistor at the

VNTC input pin.

CFTempI

65535

9102

Correction Factor for Temperature. Adjusts the scaling of

temperature measured from the internal temperature

sensor. Calibration: New CF_TEMP = Old CF_TEMP x

(Thermometer[°C]/SBData Temperature[°C] )

Note:

SBData Temperature is reported in 0.1°K

normally. It must be converted to °C for this

equation.

CFVCell1

65535

22325

Calibration Correction Factor for VCELL1. Used to

calibrate the measurement of individual cell voltage

between the VCELL1-4 input pins.

CFVCell2

65535

22393

Calibration Correction Factor for VCELL2. Used to

calibrate the measurement of individual cell voltage

between the VCELL1-4 input pins.

CFVCell3

65535

22420

Calibration Correction Factor for VCELL3. Used to

calibrate the measurement of individual cell voltage

between the VCELL1-4 input pins.

CFVCell4

65535

22470

Calibration Correction Factor for VCELL4. Used to

calibrate the measurement of individual cell voltage

between the VCELL1-4 input pins.

CFVPack

65535

20045

Correction Factor for Pack Voltage. Adjusts the scaling of

the pack voltage measurements. Used to calibrate the

measurement of pack voltage between VCELL4 input pin

and ground.

COCurr

-32768 32767

-12

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

reads when zero current is flowing through the sense

resistor.

COD

-128

127

-12

Correction Offset Deviation. Offset value for the

auto-zero calibration of the current readings.

SBData Current[mA] = (I_A/D – COCurr) x CFCurr/16384

Calibration: CF_CURR = ((Ammeter[mA] x 16384) –

8192)/(Current – I_A/D at OCV)

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