bq27750EVM Quick Start Guide
4
SLUUBP4 – June 2017
Copyright © 2017, Texas Instruments Incorporated
bq27750EVM 1-Series Li-Ion Battery Pack Manager Evaluation Module
2.3
EVM Connections Module Connections
This section covers the hardware connections for the EVM. See
.
Figure 1. bq27750 Circuit Module Connection to Cells and System Load or Charger
•
Direct connection to the cells: 1N (BAT–), 1P (BAT+)
Attach the cells to the J2 terminal block. A specific connection sequence is not required, but it is a
good practice to start with the BAT– of the battery before the BAT+. A power supply set at 4 V can be
used instead of a battery for evaluation purposes.
•
I
2
C™ (SDA, SCL)
Attach the communications interface adapter cable to J3 and to the I
2
C port on the EV2300.
NOTE:
If the EVM board is an E1 revision, it will only work with an EV2400. If it is an A revision, the
EV2300 can be used. Ensure that shunts are placed on P2 and P3 jumpers to enable the
onboard pullup resistors. If the EV2400 is used, there will be no need for shunts on P2 and
P3 because it has internal pullup resistors.
•
System load and charger connections across /Load+ and Charger-/Load-
Attach the load to the J1 terminal block. The positive terminal of the load should be connected to the
terminal block position labeled PACK+. The ground wire for the load should be connected to the other
terminal block position labeled Charger-/Load-.
•
Wake-up the device up from SHUTDOWN (WAKE)
Press the
Wake
pushbutton switch S1 to temporarily connect 1P to /Load+. This applies
voltage to the PACK pin on the bq27750 to power-up the regulators and start the initialization
sequence.
•
Parameter setup
Data flash parameters should be updated to fine tune the gauge to the pack. See the
bq27750
Technical Reference Manual
(
) for help with setting the parameters.
