bq4050EVM Quick Start Guide
5
SLUUBF9 – March 2016
Copyright © 2016, Texas Instruments Incorporated
bq4050EVM-561 Evaluation Module
•
I2C communication port (J2): SMBD, SMBC, and VSS
Attach the communications interface adapter cable to J2 and to the SMB port on the EV2300.
•
Signal outputs (J3): SYS_PRES
To start charge or discharge test, connect the SYS_PRES position on the J3 terminal block to PACK–.
The SYS_PRES can be left open if the non-removable (NR) bit is set to 1 in the
Pack Configuration A
register. To test sleep mode, disconnect the SYS_PRES pin.
•
Wake-up the device up from shutdown (WAKE)
Press the
Wake
pushbutton switch to temporarily connect BAT+ to PACK+. This applies voltage to the
PACK pin on the bq4050 to power-up the regulators and start the initialization sequence.
•
Parameter setup
The default data flash settings configure the device for 3-series Li-Ion cells. Change the |
Data Flash
|
Settings
|
DA Configuration
register to set up the number of series cells to match the physical pack
configuration. This provides basic functionality to the setup. Other data flash parameters should also
be updated to fine tune the gauge to the pack. See the bq4050 technical reference manual (TRM)
(
) for parameter settings.
2.5.3
Pin Description
lists the EVM pin descriptions.
Table 3. EVM Pins Descriptions
Pin Name
Description
PACK+
Pack positive terminal
PACK–
Pack negative terminal
4P
Positive connection to Cell #4
3P
Positive connection to Cell #3
2P
Positive connection to Cell #2
1P
Positive connection to Cell #1
1N
Negative connection to Cell #1
SYS_PRES
Connection to pull SYS_PRES to PACK- to enable the FETs
SMBD
SMBus communication data line
SMBC
SMBus communication clock line
VSS
Ground return for the SMBus signals
2.6
PC Interface Connection
The following steps configure the hardware for interface to the PC.
1. Connect the bq4050-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 or EV2400 Connections
bq4050EVM
EV2300
EV2400
SMBD
SMBD
PORT1 - SDA
SMBC
SMBC
PORT1 - SCL
VSS
GND
PORT1 - VSS
The bq4050EVM-561 is now set up for operation.
