TCPP03-M20 with STM32G0B1CBT6 failed to connect

[PaulMinh]

Hello Expert,

Could you please provide guidance on the issue below? 

We are using the following setup:

- MCU: STM32G0B1CCTx

- Software: X-CUBE-TCPP 4.2.0 with USBPD Application 4.2.0 Dual Role

- Board Part: TCPP0203 v1.2.3

We are developing a USB PD board.

When we plug in an Android smartphone (USB Type-C port), the phone does not detect the connection.

Attached is the log showing three plug-in/plug-out attempts.(we plug in and out 3 times)

From the log, it appears that after attachment, the connection detaches immediately, then the roles switch, followed by another detachment.

We have already tried increasing the CAD source/sink toggle time from 100 ms to 144 ms, but the issue persists.

Could you advise on possible causes or solutions? Thanks.

DEBUG 86569 0 -- BSP_USBPD_PWR_SetRole : SNK -- 96
DEBUG 86609 0 -- BSP_USBPD_PWR_SetRole : SRC -- 97
DEBUG 86653 0 -- BSP_USBPD_PWR_SetRole : SNK -- 98
DEBUG 86693 0 -- BSP_USBPD_PWR_SetRole : SRC -- 99
DEBUG 86705 0 -- BSP_USBPD_PWR_VBUSInit -- 100
DEBUG 86705 0 -- BSP_USBPD_PWR_SetPowerMode -- 101
DEBUG 86706 0 -- Normal -- 102
CAD 86706 0 USBPD_CAD_STATE_ATTACHED_WAIT 103
CAD 91053 0 USBPD_CAD_STATE_DETACH_SRC 104
DEBUG 91053 0 -- BSP_USBPD_PWR_VBUSDeInit -- 105
DEBUG 91053 0 -- GDP/GDC setting : default -- 106
DEBUG 91053 0 -- BSP_USBPD_PWR_SetPowerMode -- 107
DEBUG 91053 0 -- Low Power -- 108
CAD 91053 0 USBPD_CAD_STATE_SWITCH_TO_SNK 109
DEBUG 91055 0 -- BSP_USBPD_PWR_SetRole : SNK -- 110
CAD 91055 0 USBPD_CAD_STATE_DETACHED 111
DEBUG 91097 0 -- BSP_USBPD_PWR_SetRole : SRC -- 112
DEBUG 91141 0 -- BSP_USBPD_PWR_SetRole : SNK -- 113
DEBUG 91181 0 -- BSP_USBPD_PWR_SetRole : SRC -- 114

[PaulMinh]

When we try to plugin/out quickly, we chould see "USBPD_CAD_STATE_ATTACHED" state but not always.

CAD375960USBPD_CAD_STATE_ATTACHED_WAIT1627

CAD377180USBPD_CAD_STATE_ATTACHED1628

NOTIF377180USBSTACK_START1629

DEBUG377180ADVICE: USBPD_DPM_Notification:1041630

EVENT377180EVENT_ATTACHED1631

DEBUG377180VBUS ON1632

DEBUG377180-- BSP_USBPD_PWR_VBUSOn --1633

DEBUG377210-- GDP/GDC setting : SRC --1634

DEBUG377210ADVICE: USBPD_DPM_Notification:1041635

PE377210PE_SRC_STARTUP1636

NOTIF377210POWER_STATE_CHANGE1637

DEBUG377210ADVICE: USBPD_DPM_Notification:901638

PE377210PE_SRC_SEND_CAPABILITIES1639

OUT377230SOP PD3s:018    H:0x41A1    (id:0, DR:DFP, PR:SRC) SRC_CAPABILITIESDATA: 2C91013F2CD102002CB1040064400600

Option: UNCHUNKDRDUSBEPWUSBSUSPDRP

 [1] Fixed : 5V - 3A

 [2] Fixed : 9V - 3A

 [3] Fixed : 15V - 3A

 [4] Fixed : 20V - 1A

1640

OUT377250SOP PD3s:018    H:0x41A1    (id:0, DR:DFP, PR:SRC) SRC_CAPABILITIESDATA: 2C91013F2CD102002CB1040064400600

Option: UNCHUNKDRDUSBEPWUSBSUSPDRP

 [1] Fixed : 5V - 3A

 [2] Fixed : 9V - 3A

 [3] Fixed : 15V - 3A

 [4] Fixed : 20V - 1A

1641

OUT377270SOP PD3s:018    H:0x41A1    (id:0, DR:DFP, PR:SRC) SRC_CAPABILITIESDATA: 2C91013F2CD102002CB1040064400600

Option: UNCHUNKDRDUSBEPWUSBSUSPDRP

 [1] Fixed : 5V - 3A

 [2] Fixed : 9V - 3A

 [3] Fixed : 15V - 3A

 [4] Fixed : 20V - 1A

1642

PE377290PE_SRC_DISCOVERY1643

IN381880HRST1644

NOTIF381880HARDRESET_RX1645

DEBUG381880ADVICE: USBPD_DPM_Notification:301646

PE381880PE_HARD_RESET_RECEIVED1647

NOTIF381880USBSTACK_STOP1648

DEBUG381880ADVICE: USBPD_DPM_Notification:1051649

PE381880PE_SRC_HARD_RESET_TIMEOUT1650

[FBL]

Hello @PaulMinh 

Did you implement the user code provided in this example? Would you share minimum schematics with USB C connector? Compare with reference board design to narrow down the issue. 

[PaulMinh]

Hello FBL, 

We followed https://www.youtube.com/watch?v=mJ4VX_2B6wE&t=839s , for our custom board (configured as in  MX_Config.PNG, SCH.pdf).

[PaulMinh]

Hello FBL, 

What conditions, order to change from this state "USBPD_CAD_STATE_ATTACHED_WAIT" to "USBPD_CAD_STATE_ATTACHED"?

We concern there is an unstable internal resistor; debounce failed and then unable to ATTACHED.

May you suggest how to debug and fix this issue? Thanks.