BQ27000EVM Datasheet, PDF (3/19 Pages) Texas Instruments – bq27000 Single Cell Battery Fuel Gauge Evaluation Module

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bq27000EVM Based Circuit Module
2 bq27000EVM Based Circuit Module
The bq27000EVM based circuit module is an example circuit for battery fuel gauging of a single cell
Li-Ion/Li-Polymer battery pack. There are two separate circuits on the EVM module. One is the active
bq27000 fuel gauging circuitry; the other is the logic and power control to program the on-chip
configuration EEPROM of the bq27000. 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 bq27000
for the application by programming the EEPROM.
Contacts on the circuit module provide direct connection to the cell (J1-1, J2-2), the serial communications
port (J1-3). The system load and charger connect across J1-1 and J2-1.
Table 2. Test Points
TEST POINT
J1-1
J1-2
J1-3
J2-1
J2-2
J3-1
J3-2
J3-3
SIGNAL NAME
PACK+
SCL
SDA/HDQ
PACK–
BAT–
21V
PROG
GPIO/ADIN
DESCRIPTION
Cell positive/pack positive
Not used with this product
Single-wire HDQ line
Pack negative
Cell negative
High voltage for EEPROM programming
Input for timing of EEPROM programming pulse
GPIO pin of bq27000
3 bq27000EVM Circuit Module Schematic
Figure 1 shows the bq27000EVM circuit module schematic diagram.
SLUU157A – September 2004 – Revised November 2004
bq27000 Single Cell Battery Fuel Gauge
3
Evaluation Module