wm8593seft-v Wolfson Microelectronics plc, wm8593seft-v Datasheet - Page 20

• Manufacturer Part Number: wm8593seft-v
• Description: 24-bit 192khz 2vrms Multi-channel Codec
• Manufacturer: Wolfson Microelectronics plc

WM8593
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AUTO-INCREMENT REGISTER WRITE
It is possible to write to multiple consecutive registers using the auto-increment feature. When
AUTO_INC is set, the register write protocol follows the method shown in Figure 8. As with normal
register writes, the controller indicates the start of data transfer with a high to low transition on SDIN
while SCLK remains high, and all devices on the bus receive the device address.
When the WM8593 has acknowledged a correct address, the controller sends the first byte of control
data (A6 to A0, i.e. the WM8593 initial register address). The WM8593 then acknowledges the first
control data byte by pulling SDIN low for one SCLK pulse. The controller then sends a byte of
register data. The WM8593 acknowledges the first byte of register data, auto-increments the register
address to be written to, and waits for the next byte of register data. Subsequent bytes of register
data can be written to consecutive registers of the WM8593 without setting up the device and register
address.
The transfer of data is complete when there is a low to high transition on SDIN while SCLK is high.
Figure 8 2-Wire Auto-Increment Register Write
REGISTER READBACK
The WM8593 allows readback of all registers with data output on the bidirectional SDIN pin. The
protocol is similar to that used to write to the device. The controller will issue the device address
followed by a write bit, and the register index will then be passed to the WM8593.
At this point the controller will issue a repeated start condition and resend the device address along
with a read bit. The WM8593 will acknowledge this and the WM8593 will become a slave transmitter.
The WM8593 will place the data from the indexed register onto SDIN MSB first. When the controller
receives the first byte of data, it acknowledges it. When the controller receives the second and final
byte of data it will not acknowledge receipt of the data indicating that it will resume master transmitter
control of SDIN. The controller will then issue a stop command completing the read cycle.
Figure 9 2-wire Read Protocol
AUTO-INCREMENT REGISTER READBACK
It is possible to read from multiple consecutive registers in continuous readback mode. Continuous
readback mode is selected by setting AUTO_INC.
In continuous readback mode, the WM8593 will return the indexed register first, followed by
consecutive registers in increasing index order until the controller issues a stop sequence.
Figure 10 2-Wire Auto-Increment Register Readback
PD Rev 4.0 April 2008
Pre-Production
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