Software
7.4
Comms Tab
In the
Comms
tab view, shown in
, the following is allowed:
1. Set the baud rate at which the PC communicates with the bottom bq76PL455EVM in the stack (set to
250 kHz by default)
2. Issue a communications reset in the event communications with the bq76PL455EVMs have been
compromised
3. Set the communications timeout and power down wait periods (disabled by default)
NOTE:
The communication rate over the differential communication bus connecting multiple stacked
bq76PL455EVMs is fixed and cannot be adjusted. Only the rate for the single-ended link to
the PC is adjustable.
Figure 16. Comms Tab
Both the
Comm Timeout
value and the
Comm PowerDown
value can be
Disabled
or varied from 0.1
seconds to 1 Hour. These values (1) set the period after which a
COMM Timeout
fault is generated by the
bq76PL455A-Q1 if it sees no bus activity and (2) set the period after which the bq76PL455A-Q1 enters its
shut down state if it fails to see communication bus activity. By default both time out periods are disabled.
NOTE:
In the event these timeout periods are enabled, the Power Down value should always be set
to a period longer than the Timeout value so a fault is captured prior to a device shut down.
This setting is not very useful in the context of the GUI, since no corrective measures are
taken, but in a “real” system, a microprocessor is able to attempt communication recovery
before an impending shut down of the system.
30
bq76PL455EVM and GUI User Guide
SLUUBA7A – April 2015 – Revised July 2015
Copyright © 2015, Texas Instruments Incorporated
