TPS65987D: TPS65987 Schmatic review

mx gu

Part Number: TPS65987D
Other Parts Discussed in Thread: TVS2200

Hi,

Please help check the attached TPS65987D schematic.

The TPS65987D is source side.

we do not need the power dilivery through usb path, but we need the DP protocal transmition.

does the dp hpd do not link with AP, just through i2c1 irq to report to AP, instead of dp hpd interrupt as well?

thanks and br

0 Hari Patel1 over 5 years ago

Hello,

I have assigned this issue to the expert who will get back to you shortly.

Thank you,

Hari

0 pdjuandi over 5 years ago

Feedback from the schematic:

Do not see the C_CC1/2 protection IC, make sure they are there and place closer to connector.
Change LDO_1V8 cap to 4.7uF.
Is VBUS connected else where? recommend to add TVS diode like TVS2200 and Schottkey diode close to connector.
check HRESET pin again, this configuration will always cause PD to reset. Should put 100K in parallel with the 10nF cap.
HPD should connect to your display port configuration. Not sure what Q1702 RFFE6_CLK is for.

The HPD level can be read to indicate any active connection occurs since it's part of the GPIO pin.

0 mx gu over 5 years ago in reply to pdjuandi

Hi,

thanks for your replay.

About the HPD, does it mean the HPD interrupt be read out by I2C?

Could the HPD interrupt cause the I2C interupt and read the interupt by i2c?

thanks and br

0 pdjuandi over 5 years ago in reply to mx gu

Hi,

In the I2C interrupt, there is DP_SID_StatusUpdate bit which is set when the contents of DP SID status register (0x58) change.

You can find this information in the Host Interface reference manual here.

And in register 0x58, there's DP Status for TX/RX which tell you if there's HPD IRQ occurs.

I have attached a screen capture of the GUI here.

Regards,

Peter

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