BQ27000EVM Datasheet, PDF (11/19 Pages) Texas Instruments – bq27000 Single Cell Battery Fuel Gauge Evaluation Module

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Operation
Figure 9. Initital Register Screen
If the EV2300 is not connected to a USB port, the program will display a USB error message and then
display the initial data screen with no data in the register locations.
The com port can be changed by selecting the port under the options menu.
8.2 Initialization
This section describes the settings that must be made before the bq27000 is evaluated.
8.2.1 Loading the Sense Resistor Value
The bq27000EVM comes with a 20-mΩ sense resistor on the circuit board. Make sure the sense resistor
value is entered in the RS box at the top of the initial register screen. This value is used by the PC
program to convert the bq27000 data set to engineering units. Checking the display engineering units box
displays the data set in engineering units. No check mark displays the data set just as the bq27000
calculates them, i.e., in units of 3.57-µVh counts.
8.2.2 Programming the bq27000 EEPROM
Each bq27000 is programmed at the factory with default values in the EEPROM. The values in EEPROM
should be changed to match specific applications. The EEPROM values can be read by using the
EEPROM screen.
SLUU157A – September 2004 – Revised November 2004
bq27000 Single Cell Battery Fuel Gauge
11
Evaluation Module