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WM8987LGECO/V Datasheet(PDF) 33 Page - Wolfson Microelectronics plc |
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WM8987LGECO/V Datasheet(HTML) 33 Page - Wolfson Microelectronics plc |
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33 / 58 page  Pre-Production WM8987L w PP Rev 3.0 January 2007 33 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 6:0 ROUT2VOL [6:0] 1111001 (0dB) ROUT2 volume 1111111 = +6dB … (80 steps) 0110000 = -67dB 0101111 to 0000000 = Analogue MUTE 7 RO2ZC 0 Left zero cross enable 1 = Change gain on zero cross only 0 = Change gain immediately R41 (29h) ROUT2 Volume 8 RO2VU 0 ROUT2 Volume Update 0 = Store ROUT2VOL in intermediate latch (no gain change) 1 = Update gain for both channels (right=ROUT2VOL, left=from intermediate latch) R24 (18h) Additional Control (2) 4 ROUT2INV 0 ROUT2 Invert 0 = No Inversion (0 ° phase shift) 1 = Signal inverted (180 ° phase shift) Table 26 LOUT2/ROUT2 Volume Control For single-ended operation, the LO2VU and RO2VU bits provide a method to ensure that the left and right channel gains are updated at the same time (irrespective of the time delay between writing to registers R40 and R41). OUT3 OUTPUT The OUT3 pin can drive a 16 Ω or 32Ω headphone or be used as a DC reference for a capless headphone output (see page 55). OUT3SW selects the mode of operation required. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R24 (18h) Additional Control (2) 8 OUT3SW 0 OUT3 select 0 : VREF 1 : mono mixer (volume controlled by MONOVOL) Table 27 OUT3 Select When OUT3SW=1, OUT3 drives out the inverted signal from the mono mixer. In this case, the mono mixer should be enabled (MONO=1 in R26). The signal amplitude at the OUT3 output can be adjusted under software control by writing to MONOVOL in R42. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 6:0 MONOVOL [6:0] 1111001 (0dB) Mono Mixer Volume 1111111 = +6dB … (80 steps) 0110000 = -67dB 0101111 to 0000000 = Analogue MUTE R42 (2Ah) Mono mixer Volume 7 MOZC 0 Mono Mixer zero cross enable 1 = Change gain on zero cross only 0 = Change gain immediately Table 28 Mono Mixer Volume Control |
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