Other Parts Discussed in Thread: TPS65987, TPS65988
Hi Team,
Looking through the TRM for the TPS65987/88 as well as the application configuration tool V5.01 and have a question on the BC1.2 implementation.
My customer would like to use the BC1.2 detection to do 2 things.
- Detect a USB2 non-PD source via an A to C adaptor as well as a general type C connector (an example would be a USB key) and turn on the OTG function of the charger.
- Disconnect the USB bus from the host processor so that the bus resistances do not contaminate the BC1.2 detection.
In the TRM there are 2 events (I’m assuming to the 88 and not the 87) Event #123 and #124 which are BC1.2_Host_Pull_Down_Enable for port 1 and port 2.
I do not see these available as GPIO events in any version of the configuration tool that supports the TPS65987 or 88.
Is this something that could manually added to the XML file of the project or is this something that would need to be added to the software by TI?
We know we can do this by utilizing an external MCU, however we are trying to take advantage of the I2C master to control the battery charger.
Digging through the template files for the TPS65988DDH_Advanced_v5_01.tpl and TPS65987DDH_DRP_host_displayport_v5_01.tpl and found the following.
The GPIOEventDictList is different between the two devices, which is understandable given that the 88 is a dual port device, however the TRM makes no indication that the GPIO event map is different between the two. Based on the TRM I would have assumed that the Event numbers would have been the same, but that only Port 1 would have applied.
In the template for the TPS65988 I found the following:
{'name' : 'Port 0 Custom On HS Mux Event', 'inout' : 'output', 'number' : 123 },
{'name' : 'Port 1 Custom On HS Mux Event', 'inout' : 'output', 'number' : 124 },
(lines 8550 and 8551)
The indices at the end of each line correspond to the BC1.2 events in the TRM. There are no similar settings in the TPS65987DDH template. I also don’t see a debug accessory index in the 987 template.
Is this something that will be addressed in a future update or can the customer make the changes themselves or do they need to look into switching to the TPS65988?
If they do need to move to the TPS65988 and each switch is only 5A, is it possible to parallel them into a single channel if both ports are configured the same?
Thanks!
