Pre-Production
WM8850
PORT-A (NID = 11H)
Table 22 gives a summary of the Port-A node:
NODE SUMMARY INFORMATION
11h
NID
Widget Type
Pin Complex
Supported Get Verbs
Supported Set Verbs
Unsolicited Responses
Vendor-Specific Verbs
F00h, F02h, F07h, F08h, F09h, F1Ch, F8Eh
707h, 708h, 709h, 71Ch, 71Dh, 71Eh, 71Fh, 78Eh
Presence Detect
F8Eh, 78Eh : Unsolicited Response Priority Control Verb
Table 22 Port-A Node Summary Information
Port-A contains a ground-referenced headphone driver which negates the requirement for large AC-
coupling capacitors commonly required for headphone applications. The headphone driver is
powered by an on-board charge pump which generates the required positive and negative supply
voltages. Configuration of this block is handled automatically by the WM8850, and the required
external components to enable optimum performance of the charge pump are given in the
“Applications Information” section.
PP, April 2011, Rev 3.2
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
