Texas Instruments BQ27425EVM-G2B System-Side Impedance Track™ Fuel (Gas) Gauge Evaluation Module BQ27425EVM-G2B BQ27425EVM-G2B 数据表
产品代码
BQ27425EVM-G2B
LOAD
CHARGER
EV2300 or EV2400
USB
H
D
Q
I2
C
S
M
B
Battery
Pack
1
U1
D1
J6
R6
R8
R7
R
4
TP6
TP2
TB
2
C
3
C
1
C
2
J1
J2
TB
1
N
O
TE
1
J7
TP8
TP1
TP4
C4
J4
J5
R
1
R
2
R
3
R5
TP5
TP3
TP7
TP9
TB
3
J3
J8
TP10
VSS
LOAD+
CHARGER-\LOAD-
REGIN
CE
REGIN
REGIN
EXT
EXT_CE
PACK+
.210
ESD Protection
VSS
V
S
S
CHARGER+\
VCC
.145
CE
PACK+
PACK-
SDA
SCL
E
X
T
PACK+
PACK-
BIN
GPOUT
E3
D3
U1
J6
TB2
J1
J2
TB1
J7
TP8
J4
J5
R
1
TP5
TP3
TP7
TP9
TB
3
J3
J8
TP10
Operation
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
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 (
sequence. The DataRAM screen (
) 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>.
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 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.
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.
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
Copyright © 2011–2013, Texas Instruments Incorporated