TPS65987D: TPS65987D usage

Hi Koji-san,

They may try to do that for a power adapter, but it is not recommended because if PP_Cable is not supplied appropriate power, all CC communication will be disabled and therefore will not allow for alternate modes either.

If PP_HV2 is unused, then yes it may be tied to GND. For sink path, yes PP_HV1 is recommended. If the customer is using TIDA-01627, they should follow the configuration shown in this user's guide: http://www.ti.com/lit/ug/tidue65a/tidue65a.pdf

Yes, during dead battery configurations if BP_NoResponse is selected the power switch will not be enabled and the device will not start up unless VIN_3V3 is present. The section 8.4 Device Functional Modes in the datasheet contains two tables (Table 5 and Table 6) which shows the dead battery configurations.

There is also a note that states "Devices implementing the BP_WaitFor3V3_External or BP_ECWait_External configuration must use GPIO16 for external sink path control, while devices implementing the BP_WaitFor3V3_Internal or BP_ECWait_Internal must use PPHV1 as the sink path." Therefore, in this configuration, PPHV1 cannot be used as a source, PPHV1 must be a sink path, as was recommended on page 25 like you mentioned.

Thank you,

Hari

Hello Hari-san,

Thank you very much for your support. Please let me confirm.

*In TIDA-01627 schematic, PP_CABLE is pulled to GND. Can TPS65987D with PP_CABLE GND work as USB power delivery power bank properly?

*If they pull PP_CABLE pin to GND, what function their system can't support? USB communication, alternate mode and >3A charging? 

*Can PP_HV1 be used as bi-directional sink/source path?

*If PP_HV2 is tied to GND, do they need to set any register bit for PP_HV2 disable?

Thanks,

Koji Ikeda

Hi Koji-san,

Yes, if PP_CABLE is pulled to GND, USB power delivery can work properly but the functions will be limited.

Their system will not be able to support any of the features you mentioned, no USB communication, VCONN, alternate modes and the current may also be restricted <3A.

Yes, PPHV_1 can be used as a bi-directional sink/source path if the power bank system is designed bi-directional as well, for example using a buck-boost converter.

To set PP_HV2 to GND, you must configure that switch as disabled in the GUI configurations (Global System Configurations 0x27).

Thank you,

Hari

Hello Hari-san,

Thank you very much for your support.  Please let me confirm, PP2 switch on 0x27 GUI is for HV_PP2? PP3 and PP4 is control for external FET?

Thanks,

Koji Ikeda