Datasheet
LOAD
CHARGER
EV2300 or EV2400
USB
HDQI2CSMB
Battery
Pack
1
U1
D1
J6
R6
R8
R7
R4
TP6
TP2
TB2
C3
C1
C2
J1
J2
TB1
NOTE1
J7
TP8
TP1
TP4
C4
J4
J5
R1
R2
R3
R5
TP5
TP3
TP7
TP9
TB3
J3
J8
TP10
VSS
LOAD+
CHARGER-\LOAD-
REGIN
CE
REGIN
REGIN
EXT
EXT_CEPACK+
.210
ESDProtection
VSS
VSS
CHARGER+\
VCC
.145
CE
PACK+
PACK-
SDA
SCL
EXT
PACK+
PACK-
BIN
GPOUT
E3
D3
U1
J6
TB2
J1
J2
TB1
J7
TP8
J4
J5
R1
TP5
TP3
TP7
TP9
TB3
J3
J8
TP10
Operation
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Figure 6. bq27425 Circuit Module Connection to Pack and System Load/Charger
7.2 PC Interface Connection
The following steps configure the hardware for interface to the PC.
1. Connect the bq27425-based EVM to the EV2300 or EV2400 using wire leads as shown in Table 4.
2. Connect the PC USB cable to the EV2300 or EV2400 and the PC USB port.
Table 4. Circuit Module to EV2300/EV2400 Connections
bq27425EVM EV2300/EV2400
SDA SDA
SCL SCL
VSS GND/VSS
The bq27425EVM is now set up for operation.
8 Operation
This section details the operation of the bq27425 EVSW software.
8.1 Starting the Program
Run bq27425 EVSW from the Start | Programs | Texas Instruments | bq Evaluation Software menu
sequence. The DataRAM screen (Figure 7) appears. Data begins to appear once the <Refresh> (single
time scan) button is clicked, or when the <Keep Scanning> check box is checked. To disable the scan
feature, deselect <Keep Scanning>.
The continuous scanning period can be set with the | Options | and | Set Scan Interval | menu selections.
The range for this interval is 0 ms to 65,535 ms. Only items that are selected for scanning are scanned
within this period.
The bq27425 EVSW provides a logging function which logs the values that were last scanned by EVSW.
To enable this function, select the Start Logging button; this causes the Keep Scanning button to be
selected. When logging is stopped, the Keep Scanning button is still selected and has to be manually
unchecked.
The logging intervals are specified under the | Options | menu with the maximum value of 65,535 ms. The
Log interval cannot be smaller than the scan interval because this results in the same value being logged
at least twice.
8
bq27425 EVM: Single-Cell Impedance Track Technology SLUU656A–October 2011–Revised January 2013
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