WM8734 datasheet(33/46 Pages) WOLFSON

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WM8734

Production Data

PD Rev 4.1 November 2006

3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE

The WM8734 can be controlled using a 3-wire serial interface. SDIN is used for the program data,

SCLK is used to clock in the program data and CSB is use to latch in the program data. The 3-wire

interface protocol is shown in Figure 23.

CSB

SCLK

SDIN

B15

B10

B11

B12

B13

B14

Figure 23 3-Wire Serial Interface

Notes:

B[15:9] are Control Address Bits

B[8:0] are Control Data Bits

2-WIRE SERIAL CONTROL MODE

The WM8734 supports a 2-wire MPU serial interface. The device operates as a slave device only.

The WM8734 has one of two slave addresses that are selected by setting the state of pin 10, (CSB).

SDIN

SCLK

ACK

R ADDR

ACK

DATA B15-8

STOP

START

DATA B7-0

R/W

ACK

Figure 24 2-Wire Serial Interface

Notes:

B[15:9] are Control Address Bits

B[8:0] are Control Data Bits

CSB STATE

(Default = LOW)

Address

0011010

0011011

Table 17 2-Wire MPU Interface Address Selection

To control the WM8734 on the 2-wire bus the master control device must initiate a data transfer by

establishing a start condition, defined by a high to low transition on SDIN while SCLK remains high.

This indicates that an address and data transfer will follow. All peripherals on the 2-wire bus respond

to the start condition and shift in the next eight bits (7-bit address + R/W bit). The transfer is MSB

first. The 7-bit address consists of a 6-bit base address + a single programmable bit to select one of

two available addresses for this device (see table 24). If the correct address is received and the R/W

bit is ‘0’, indicating a write, then the WM8734 will respond by pulling SDIN low on the next clock pulse

(ACK). The WM8734 is a write only device and will only respond to the R/W bit indicating a write. If

the address is not recognised the device will return to the idle condition and wait for a new start

condition and valid address.

Once the WM8734 has acknowledged a correct address, the controller will send eight data bits (bits

B[15]-B[8]). WM8734 will then acknowledge the sent data by pulling SDIN low for one clock pulse.

The controller will then send the remaining eight data bits (bits B[7]-B[0]) and the WM8734 will then

acknowledge again by pulling SDIN low.

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