PS501_04 Datasheet, PDF (32/44 Pages) Microchip Technology – Single Chip Field Reprogrammable Battery Manager - Nickel Chemistries

PS501-0901
TABLE 8-2: CALIBRATION
Parameter # Lower Upper Typical
Name Bytes Limit Limit Value
Operational Description
Config1
OSCTrim
BGCal
RefCal
CFCurr
COCurr
COD
CFTempE
COTempE
CFTempI
COTempI
CFVPack
COVPack
CalStatus
1
0x0 0xFF
0x69 Bootload configuration.
1
0
255
200 RC oscillator trimming.
1
0
255
11
Band gap voltage calibration factor.
1
0
255
19 Reference voltage calibration factor.
2
0 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.
1 -128 127
-12 Correction Offset for Current. This is the value the A/D reads
when zero current is flowing through the sense resistor.
1 -128 127
-12 Correction Offset Deviation. Offset value for the auto-zero
calibration of the current readings.
SBData Current [mA] = (I_A/D – COCurr – COD) x CFCurr/16384
Calibration: CFCurr = ((Ammeter [mA] x 16384) – 8192)/
(Current – I_A/D at OCV)
2
0 65535 1300 Correction Factor for Temperature. Adjusts the scaling of
temperature measured across an external thermistor at the VNTC
input pin.
1 -128 127
-2
Correction Offset for Temperature. Offset = 0 used for
temperature measurement using internal temperature sensor.
2
0 65535 23800 Correction Factor for Temperature. Adjusts the scaling of
temperature measured from the internal temperature sensor.
Calibration: New CFTemp = Old CFTemp 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.
2 -32768 32767 -11375 Correction Offset for Temperature. Offset = 0 used for
temperature measurement using internal temperature sensor.
2
0 65535 20045 Correction Factor for Pack Voltage. Adjusts the scaling of the
pack voltage measurements. Used to calibrate the measurement
of pack voltage.
1 -128 127
0
Correction Offset for Voltage. Offset factor used for pack voltage
reading.
1
0
255 b00000000 Bit Function
7
Factory calibrated
6
EE/Flash downloaded
5
RC oscillator
4
External temperature
3
Internal temperature
2
Current
1
Pack voltage
0
Cell voltages
0 = Not calibrated
1 = Calibrated
DS21902A-page 32
 2004 Microchip Technology Inc.