WM8593 datasheet(19/98 Pages) WOLFSON

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WM8593

PP Rev 1.0 January 2007

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

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 7 2-Wire Auto-Increment Register Write

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 8 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 9 2-Wire Auto-Increment Register Readback

WM8593 Datasheet(PDF) 19 Page - Wolfson Microelectronics plc