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Peter Green
Peter Green
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Yes, on a female USB C connector for a device (hosts, dual-role devices etc are another matter) CC1 and CC2 should be pulled down separately.

If the pull-downs are omitted completely then a power supply with a UsBCUSB C socket should not turn on it's output.

As Raspberry pi found out if you tie them together and use a single pull-down then it will work with passive cables, but at least some (not clear if it's all) electronically marked cables will fail to operate correctly.

Yes, CC1 and CC2 should be pulled down separately.

If the pull-downs are omitted completely then a power supply with a UsBC socket should not turn on it's output.

As Raspberry pi found out if you tie them together and use a single pull-down then it will work with passive cables, but at least some (not clear if it's all) electronically marked cables will fail to operate correctly.

Yes, on a female USB C connector for a device (hosts, dual-role devices etc are another matter) CC1 and CC2 should be pulled down separately.

If the pull-downs are omitted completely then a power supply with a USB C socket should not turn on it's output.

As Raspberry pi found out if you tie them together and use a single pull-down then it will work with passive cables, but at least some (not clear if it's all) electronically marked cables will fail to operate correctly.

Source Link
Peter Green
Peter Green
  • 23.1k
  • 1
  • 41
  • 86

Yes, CC1 and CC2 should be pulled down separately.

If the pull-downs are omitted completely then a power supply with a UsBC socket should not turn on it's output.

As Raspberry pi found out if you tie them together and use a single pull-down then it will work with passive cables, but at least some (not clear if it's all) electronically marked cables will fail to operate correctly.