6 Communication Control
Figure 6-1. BQ79616 GUI Communication Control Page
6.1 Communication Configuration
Under this tab, the user can configure the following settings:
• TX Holdoff: Integer between 0–255, specifies the number of bit periods the UART transmitter waits after the
last bit reception before starting transmission.
• Communication Timeout Thresholds
– Short Comm Timeout: Timer resets every time a valid response or command frame is received, sets
CTS system fault when timer expires.
– Long Comm Timeout: Allows the host to put the device in SLEEP or SHUTDOWN modes for power
saving, timer resets every time a valid response or command frame is received, executes Long Timeout
Action when timer expires.
• Long Timeout Action: On a long timeout, either send the device to SLEEP and set a CTL system fault or
send the device to SHUTDOWN.
The GUI also supports communication debug mode of the BQ79616, which can be enabled via the Debug
Control slider. Debug mode grants the user control of the COMH/L receivers and transmitters, and also allows
the user to toggle the UART TX and UART Mirror functions on stack devices. Note that the base device should
always have its UART TX enabled and UART mirror disabled, so these toggles are disabled for broadcast and
base device communication modes.
6.2 Control Register and Tones
This tab provides the user with the ability to both send tones and change bits in the CONTROL1 register of a
device via buttons labeled by function.
A tone is a set of pulses that travels through COMH and COML ports. For the BQ79616, WAKE and
SLEEPtoACTIVE tones are propagable, meaning that once one device receives either tone, it generates the
same tone to send to the next device up the stack. Conversely, SHUTDOWN and HW RESET tones are non-
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Communication Control
SLUUC36 – DECEMBER 2020
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BQ79616-Q1 and BQ75614-Q1 GUI User's Guide 21
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