bq76940/bq76930/bq76920 Software
Figure 3. bq76940/bq76930/bq76920 Evaluation Software Display
The software window contains a menu bar and 3 sections. The top section is an I2C tool. The middle
section has 3 selectable views. The bottom section is a status section. Details are described in following
sections.
4.4.1
Status Section
The bottom section displays the software name and version, the CRC mode and the communication
status. The CRC mode is automatically detected and the software communicates to the IC appropriately.
To the right of the CRC mode is a communication status area which may display information about the
communication with the device. Common displays and actions may include the following:
•
Data channel name is invalid
. Check the USB connection to the interface board. Exit and re-start the
software
•
No acknowledge from device
. Check that the 4-pin cable is connected, the EVM is powered, and boot
the device, then try to read the device.
•
CRC read from device does not match calculated CRC
. Check that the
Read Device
button was used
to detect the device. Check the connection of the 4-pin cable or its routing near high noise sources.
•
Not able to find a free communication adapter
. Check the connection of the USB cable to the
communication adapter.
•
USB adapter timeout
. Unplug and re-connect the USB cable and try to read from the device again.
•
When the status area is blank, the last communication with the device was successful
4.4.2
I2C Section
The top section of the window below the menu bar has the I2C address and a byte communication tool.
The I2C address must be entered, the tool does not automatically detect the address. The default address
is 0x08 which is the default address for the device on the EVM. If the AFE on the EVM has been changed
to a different address, the address must be entered. The value is the 7 bit address and is shifted left 1 bit
position when observed on the bus.
13
SLVU925B – April 2014 – Revised July 2014
bq76930 and bq76940 Evaluation Module User's Guide
Copyright © 2014, Texas Instruments Incorporated