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SLUUBD3D – September 2015 – Revised September 2018
Copyright © 2015–2018, Texas Instruments Incorporated
System Present
Chapter 6
SLUUBD3D – September 2015 – Revised September 2018
System Present
6.1
Introduction
The bq78350-R1 has the capability to detect the presence of a system and/or a charger through the state
of the PRES pin. This can be used to disable the battery output when the bq78350-R1 detects the battery
has been removed from the system or charger.
6.2
System Present Detection and Action
The PRES pin is polled every 250 ms and if it is detected High for four consecutive 250-ms samples, then
the CHG, DSG, and PCHG FETs are turned off. If PRES is detected Low, then the FETs are allowed to
be turned on depending on other safety and charging related algorithms. If this feature is not required,
then the PRES pin should be tied to VSS.
System Present Detection can be selected as an action to clear some types of protection faults. See
