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8.2
Initialization
8.2.1
Loading the Sense Resistor Value
8.2.2
Programming the bq27x10 EEPROM
Operation
If the EV2300 is not connected to a USB port, the program displays a USB error message and then
displays the initial data screen with no data in the register locations.
The comm port can be changed by selecting the port under the options menu.
This section describes the settings that must be made before the bq27x10EVM is evaluated.
The bq27x10EVM comes with a 20-m
Ω
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 bq27x10 data set to engineering units. A check mark in the display engineering
units box displays the data set in engineering units. No check mark displays the data set just as the
bq27x10 calculates them, i.e., in units of 3.57-
µ
Vh counts.
Each bq27x10 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.
Figure 10. EEPROM Screen
The values in the EEPROM can be easily changed using the EVM's auto programming feature. To use the
auto program feature:
1. Make sure VOUT of the EV2300 is connected to PROG of the EVM.
12
bq27x10EVM Single-Cell Battery Fuel Gauge
SLUU259 – October 2006
Evaluation Module
