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bq27x10-Based Circuit Module
bq27x10-Based Circuit Module
The bq27x10EVM-based circuit module is an example circuit for battery fuel gauging of a single-cell
Li-ion/Li-polymer battery pack. The EVM module has two separate circuits. One is the active bq27x10 fuel
gauging circuitry; the other is the logic and power control to program the on-chip configuration EEPROM
of the bq27x10. In a typical application, only the active fuel gauging circuitry is required. The EEPROM
programming circuitry would be required in a test setup to configure the bq27x10 for the application by
programming the EEPROM.
Contacts on the circuit module provide direct connection to the cell (J1-1, J2-2), and the serial
communications port (J1-3). The system load and charger connect across J1-1 and J2-1.
Table 2. Test Points
TEST POINT
SIGNAL NAME
DESCRIPTION
J1-1
PACK+
Cell positive/pack positive
J1-2
SCL
Used only with bq27210 as the I2C Clock line
J1-3
SDA/HDQ
Single-wire HDQ line for bq27010 or I2C Data line for
bq27210
J2-1
PACK–
Pack negative
J2-2
BAT–
Cell negative
J3-1
21V
High voltage for EEPROM programming
J3-2
PROG
Input for timing of EEPROM programming pulse
J3-3
GPIO/ADIN
GPIO pin of bq27x10
SLUU259 – October 2006
bq27x10EVM Single-Cell Battery Fuel Gauge
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Evaluation Module
