Texas Instruments Evaluation Module for BQ76925 Analog Front End for 3 to 6 Series Lithium-Ion Cells BQ76925EVM BQ76925EVM Datenbogen
Produktcode
BQ76925EVM
Overview
•
A color monitor with 1024
×
768 or better resolution
1.3.3
USB-TO-GPIO Adapter
The USB-TO-GPIO Adapter is actually an EVM available from Texas Instruments. It is used to provide the
I2C connection between the bq76925 and the PC.
I2C connection between the bq76925 and the PC.
CAUTION
The USB-TO-GPIO Adapter original firmware is 1.0.10. Firmware version
2.0.19 or later must be installed using the USB-TO-GPIO Firmware Updater
software available (free) on the TI Web site at
2.0.19 or later must be installed using the USB-TO-GPIO Firmware Updater
software available (free) on the TI Web site at
1.3.4
Power Supply for Onboard Cell Simulator
A resistor divider network is provided on the bq76925EVM to simulate cells. This allows basic evaluation
of the bq76925 without the use of cells. In this case, a power supply connected between BATT+ and
BATT
of the bq76925 without the use of cells. In this case, a power supply connected between BATT+ and
BATT
–
is required to power the resistor network. A 24-V power supply with a current capability of 100 mA
is required to power the circuit .
1.3.5
Power Supply for Simulation of Current
A second power supply is used to simulate battery current. The bq76925 expects a sense resistor value of
0.001
0.001
Ω
and 1 mV is equal to 1 A. A jumper (J5) allows the sense resistor to be disconnected from the
current input of the bq76925 and be replaced with a millivolt source. A power supply that can accurately
provide up to 100 mV can allow for simulated testing of up to 100 A without actually running this
dangerously high current.
provide up to 100 mV can allow for simulated testing of up to 100 A without actually running this
dangerously high current.
1.3.6
Battery
Lithium-ion, rechargeable-type cells can be used with this EVM. Typical cell voltage rating is 3.3 V to 3.7 V
nominal and the pack consists of 3- to 6-series connected cells. Almost all Lithium-ion chemistries can be
used with the bq76925.
nominal and the pack consists of 3- to 6-series connected cells. Almost all Lithium-ion chemistries can be
used with the bq76925.
WARNING
This EVM has no battery current control devices (MOSFETs) that
can stop the flow of charge or discharge current in the event that a
dangerous condition is induced through discharging or charging
of a battery. Exercise extreme caution when using a battery with
this EVM.
can stop the flow of charge or discharge current in the event that a
dangerous condition is induced through discharging or charging
of a battery. Exercise extreme caution when using a battery with
this EVM.
1.3.7
Power Supply to Charge Battery
A power supply can be connected to the PACK
±
terminals to provide charge current if a battery is
connected to the BATT
±
inputs.
5
SLUU514
–
July 2011
bq76925EVM Evaluation Module
Copyright
©
2011, Texas Instruments Incorporated