Datasheet

32.8.1.6 Pad Calibration

Name: PADCAL

Offset: 0x28

Reset: 0x0000

Property: PAC Write-Protection

The Pad Calibration values must be loaded from the NVM Software Calibration Area into the USB Pad

Calibration register by software, before enabling the USB, to achieve the specified accuracy.

Refer to NVM Software Calibration Area Mapping for further details.

Refer to for further details.

Bit 15 14 13 12 11 10 9 8

TRIM[2:0] TRANSN[4:2]

Access

R/W R/W R/W R/W R/W R/W

Reset 0 0 0 0 0 0

Bit 7 6 5 4 3 2 1 0

TRANSN[1:0] TRANSP[4:0]

Access

R/W R/W R/W R/W R/W R/W R/W

Reset 0 0 0 0 0 0 0

Bits 14:12 – TRIM[2:0] Trim bits for DP/DM

These bits calibrate the matching of rise/fall of DP/DM.

Bits 10:6 – TRANSN[4:0] Trimmable Output Driver Impedance N

These bits calibrate the NMOS output impedance of DP/DM drivers.

Bits 4:0 – TRANSP[4:0] Trimmable Output Driver Impedance P

These bits calibrate the PMOS output impedance of DP/DM drivers.