wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 21

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
Figure 11 Control Interface 2-wire Register Write
Figure 12 Control Interface 2-wire Register Read
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the next eight bits on SDIN (7-bit device ID + Read/Write bit, MSB first). If the device ID received
matches the device ID of the WM9081, then the WM9081 responds by pulling SDIN low on the next
clock pulse (ACK). If the device ID is not recognised or the R/W bit is ‘1’ when operating in write only
mode, the WM9081 returns to the idle condition and waits for a new start condition and valid
address.
If the device ID matches the device ID of the WM9081, the data transfer continues as described
below. The controller indicates the end of data transfer with a low to high transition on SDIN while
SCLK remains high. After receiving a complete address and data sequence the WM9081 returns to
the idle state and waits for another start condition. If a start or stop condition is detected out of
sequence at any point during data transfer (i.e. SDIN changes while SCLK is high), the device
returns to the idle condition.
The WM9081 supports the following read and write operations:
The sequence of signals associated with a single register write operation is illustrated in Figure 11.
The sequence of signals associated with a single register read operation is illustrated in Figure 12.
The Control Interface also supports other register operations, as listed above. The interface protocol
for these operations is summarised below. The terminology used in the following figures is detailed in
Table 4.
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•
•
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Single write
Single read
Multiple write using auto-increment
Multiple read using auto-increment
PP, Rev 3.0, April 2009
WM9081
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