P
ACK+
SYS PRES
P
ACK
–
+
–
EV2300
Load/Charger
SMBD
SMBC
VSS
bq4050EVM Quick Start Guide
4
SLUUBF9 – March 2016
Copyright © 2016, Texas Instruments Incorporated
bq4050EVM-561 Evaluation Module
2.5.1
Connecting the bq4050 Circuit Module to a Battery Pack
illustrates the circuit module connections.
Figure 1. bq4050 Circuit Module Connection to Pack and System Load or Charger
2.5.2
Circuit Module Connections
Contacts on the circuit module provide the following connections:
•
Direct connection to the battery pack (J1 and J5): 1N, 1P, 2P, 3P, 4P
Attach the cells to the J1 and J5 terminal block. A specific cell connection sequence is not required;
although, it is good practice to start with lowest cell in the stack (cell 1), then attach cells 2 through 4 in
sequence. The U1 and U2 devices should not be damaged by other cell connection sequences, but
there is a possibility that the bq296103 could blow the fuse in an application where the fuse is installed.
Attaching cells starting with cell 1 should eliminate this risk. A short should be placed across unused
voltage sense inputs (see
).
Figure 2. Cell Connection Configuration
A resistor cell simulator can be used instead of battery cells. Connect a resistor between each of the
contacts on the J1 or J5 connector. For example, from 1N to 1P, from 1P to 2P, and so forth, until the
desired number of cells has been achieved. A power supply can provide power to the cell simulator.
Set the power supply to the desired cell voltage × the number of cells and attach the ground wire to 1N
and the positive wire to 4P. For example, for a 3S configuration with a 3.6-V cell voltage, set the power
supply to 3 × 3.6 = 10.8 V.
•
Charger/load connection (J3 and J4): PACK+ and PACK–
Attach the load or power supply to the J3 or J4 terminal block. The positive load or power supply wire
should be connected to at least one of the first two terminal block positions labeled PACK+. The
ground wire for the load or power supply should be connected to the last terminal block positions
labeled PACK–.
