WM8753 datasheet(63/87 Pages) WOLFSON

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WM8753L

Advanced Information

AI Rev 3.1 June 2004

Figur

e 25 2-Wire Serial Control Interface

The WM8753L has two possible device addresses, which can be selected using the GPIO5/CSB pin.

The pin is sampled at power-up and selects the device address. After power-up the pin is available

for general purpose use in 2-wire interface mode.

GPIO5/CSB STATE

DEVICE ADDRESS

Low

0011010

High

0011011

Table 59 2-Wire MPU Interface

READ/WRITE OPERATION

The control interface of the WM8753L is a write only interface. However setting register bit READEN

in 3-wire mode will allow a status word to be read from the device. A status word consists of 8 bits.

Different status words are supported by the device, and are selected by changing the READSEL

In 3-wire mode an additional pin is required for serial data output from the device. This data can be

routed to the ADCDAT, GP1, GP2, GPIO3 or GPIO4 pins. The pin will be tri-state when the CSB pin

is high, allowing data from multiple sources to be connected to the same controller.

In 3-wire mode, reads and write occur simultaneously (i.e. data is clocked in and out at the same

time). Usually a read can be paired with a write, but if this is not possible it is recommended that

reads be paired with a dummy write to register R0, which is unused.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

RDDAT

Selects ADCDAT as SDOUT for 3-wire

readback

0 = ADCDAT not selected for readback

1 = ADCDAT selected for readback

3:1

READSEL

000

Read register select

See table Table 61 below

R24 (18h)

Read Control

READEN

Control interface read enable

0 = Control interface is write only

1 = Control interface supports read and

write.

Table 60 Control Interface Control

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