Component Feature

• 64GB UFS 2.1 3D
• Controller :
• Hy

Failure Symptom

• Under lower temperature ( -30 degree )
• Enter the Sleep Mode
• Enter/Exit Fail

Failure procedure

• The NMOS TR Vt increment of PLL (Phase Locked Loop) circuit within UFS controller does not work properly
• Inspecting Device Tx data line Eye diagram, the lower temperature jitter value was not work properly

Cause

• caused by the thickness increment of TR gate oxide during foundry Fab.(TSMC, 28nm)