About TI TPS65988DDJ with Lenovo Thinkpad T480 NB CC/PD issue

1. Below jpg   —– The DOCK TPS65988DDJ Power on >> connect to  USB Type C cable to Lenovo T480 NB —-The CC  Handshake and PD  is Good . 

2.  If  USB Type C Cable connect to T480 NB first, then turn on the DOCK Power (TPS65988DDJ power on ) —- The  CC Keep 1.2x voltage , and handshake file PD Source  voltage is not  success.  below  as  jpe 

  Below as question : 

 1.  TPS65988DDJ  have  dead battery function ?

 2.  Try the  TPS65988DDH Chip , test is good on the T480 NB not find the same issue, but the FW is different.

    Note : TPS65988DDJ  user tool  6.2.3  version ;  the FW TPS65987_88_F807_12_37  and TPS65987_88_F807_12_50 version both the same on the issue . 

     So please help analyze and discuss this issue. How to solve it. Update FW?

Johnsin Tao：

Hi

   很抱歉，正在为您查询此问题，请耐心等待

Ted Lin2：

回复 Johnsin Tao:

Hi John：
Is there any further analysis?
i will try return 88 tool 5.13 version , FW707_10_06 test is ok , for this platform
Please check the TPS65988 which is the last tool and FW which is more suitable?

Annie Liu：

回复 Ted Lin2:

Hi Ted,

Please be informed that this issue has been taken offline.

Annie