TPS65982: CC pin Detection and Pin state Reg 0x69

Steve Riley

Part Number: TPS65982
Other Parts Discussed in Thread: TPS65987DDK

Tool/software:

Register 0x69 provides the status of the CC pin. On a properly connected device (an AltMode DP display), the status bytes are:
Byte 1 = 0x02; Byte 2 = 0x00; Byte 3 = 0x02; Byte 4 = 0x44

This indicates CC2 is the PD communication line, CC1 is not connect, CC2 has Rd detected and DRP is Attached SRC

On systems where no power is being delivered the status byte is:

Byte 1 = 0x00; Byte 2 = 0x02; Byte 3 = 0x00; Byte 4 = 0x4d

This indicates CCpinForPD Not connected. Which is why no power is being enabled. Correct? But why the following:
Byte 2 = 0x02; Byte 3 = 0x00; Byte 4 = 0x4D

If Byte 2 indicates CC1 is Rd connected, why isn't Byte 1 reading 0x01?

If Byte 0 is 0x00, are the other bytes valid?

11 months ago

0 Aya Khedr 11 months ago

TI__Mastermind 30392 points

Hi Steve,

Thank you for reaching out!

The TPS65982 is not recommended for new designs (see below from product page).

Is this a new design or already in production?

Best Regards,

Aya Khedr

0 Steve Riley 11 months ago in reply to Aya Khedr

Intellectual 385 points

This for an already released product. We are investigating an issue with an AltMode DP display being connected to our product which uses the TPS65982.

0 Aya Khedr 11 months ago in reply to Steve Riley

TI__Mastermind 30392 points

Hi Steve,

Unfortunately, there is limited support on this part. Would you be interested in looking into our newer part, the TPS65987DDK?

Best Regards,

Aya Khedr

0 Steve Riley 11 months ago in reply to Aya Khedr

Intellectual 385 points

We are going to update our product with the TPS65987DDK, however we need to solve the problem with the current product's use of the TPS65982.

0 Aya Khedr 11 months ago in reply to Steve Riley

TI__Mastermind 30392 points

Hi Steve,

Great! Could you elaborate on the problem with the current product?

Best Regards,

Aya Khedr

0 Steve Riley 11 months ago in reply to Aya Khedr

Intellectual 385 points

We want to understand the validity of the CC status bits in register 0x69. As indicated in the original post, the status bits indicate which CC line is being used for communication and which are connected. In the case of the display not being power on, the status for the communication is no CC line, but other bits indicate that they are connected. Can you provide a description of when/how these bits get set?

0 Aya Khedr 11 months ago in reply to Steve Riley

TI__Mastermind 30392 points

Hi Steve,

I'll check internally and get back to you on the CC status bits by Wednesday.

Best Regards,

Aya Khedr

Power management

Power management forum

TPS65982: CC pin Detection and Pin state Reg 0x69