Texas Instruments bq20z65EVM-001, Руководство пользователя

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9 Calibration Screen
9.1 How to Calibrate
9.2 To Calibrate the bq20z65
9.3 Board Offset Calibration
9.4 Pack Voltage Calibration
Calibration Screen
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The bq20z65 allows for an automatic data flash export function, similar to the SBS Data logging function.
This feature, when selected via | Options | Auto Export |, exports Data Flash to a sequential series of files
named as
FilenameNNNNN.gg where N = a decimal number from 0 to 9.
The AutoExport interval is set under the | Options menu | with a minimum value of 15 s. The AutoExport
filename also is set under the | Options menu |.
When a check mark is next to | AutoExport |, the AutoExport is in progress. The same menu selection is
used to turn on/off AutoExport.
If the data flash screen is blank, then the bq20z65 that is being used may not be supported by the
bqEVSW version that is being used. An upgrade may be required.
The bq20z65 must be calibrated using power supplies or a power supply and cell simulation resistors (200
Ω
to 1000
Ω
each) before cells are attached. Before the bq20z65 is calibrated:
•
Connect and measure a 2-A current source from 1N (-) and Pack- (+) to calibrate without using the
FETs. (Calibration using the FETs is not recommended.)
•
Measure the pack voltage from Batt+ to Batt- (total of cell voltages).
•
Measure the temperature of the pack.
•
These steps may not be required, depending on the type of calibration being performed.
Perform the following steps.
1. Select the types of calibration to be performed (see Figure 10 ).
2. Enter the measured values for the types selected (except for CC Offset Calibration).
3. If
Voltage Calibration is selected, then enter the number of cells on the pack.
4. If Temperature Calibration is selected, then select the sensor that is to be calibrated.
5. If the current source is connected between 1N and Pack-, then select the Off (bypassed) check box in
the FET Control section.
6. Press the Calibrate Part button.
The following steps perform the offset calibration for the current offset of the board.
1. Remove load/external voltage and short Pack- to Batt-.
2. Press the
CC Board Offset Calibration button.
The following steps calibrate the voltage at the AFE Pack pin.
1. Ensure that Voltage Calibration has been performed for the pack. Ensure that a stable charger voltage
higher than 8-V is present at Pack+.
2. Press the Pack Voltage button to calibrate.
12 bq20z65EVM-001 SBS 1.1 Impedance Track™ Technology SLUU353 – June 2009
Enabled Battery Management Solution Evaluation Module
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