Wolfson WM8510-EV1M, Руководство пользователя

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WM8510-EV1M
w
Rev 1.1 April 2006
26
HPDETECT, HEADPHONE AND BTL SPEAKER SETUP
Figure 18 shows example settings required for headphone detect, headphone output and BTL
speaker output when configured for DAC output in Slave mode.
Shorting LNK5 will connect a headphone detect signal to the CSB/GPIO pin.
To allow BTL speaker output it is necessary to set SW20 and SW21 to select the path to the
speaker connector. The BTL speaker can then be connected to the speaker connector J26. A USB
power supply cannot provide enough current to allow the maximum speaker power output from the
WM8510 device, therefore in this example an ex5V supply is connected to J36 to allow the
extra current required. SW13 must be set to the lower position to connect the external supply and
the relevant x1.5 gain boost register settings must be made to the WM8510 device.
The relevant register settings need to be set up in the WM8510 device; refer to the latest device
datasheet for register set-up.
Figure 18 Headphone Detect, Cap-less Headphone and BTL Speaker Output Example Setup
LINKS, JUMPERS
AND SWITCHES
SWITCH
POSITION
DESCRIPTION
H1 All Links ON CS8427 clocks input [default setting]
H5 All Links ON CS8427 clocks output [default setting]
SW8 1-2 SPDIF PCM clocks input selected [default setting]
SW11 2-3 USB DCVDD supply selected [default setting]
SW12 2-3 USB DBVDD supply selected [default setting]
SW13 1-2 External SPKVDD supply selected