WM8599SEFTSLASHV datasheet(17/74 Pages) WOLFSON

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WM8599

PP Rev 1.0 January 2007

Figure 7 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 WM8599 will return the indexed register first, followed by

consecutive registers in increasing index order until the controller issues a stop sequence.

Figure 8 2-Wire Auto-Increment Register Readback

Any write to register R0 (00h) will reset the WM8599. All register bits are reset to their default values.

DEVICE ID AND REVISION

Reading from register R0 returns the device ID. Reading from register R1 returns the device revision

number.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DEVICE_ID

00h

15:0

DEVICE_ID

[15:0]

10000101

10011001

Device ID

A read of this register will return the device

ID, 0x8599.

REVISION

01h

7:0

REVNUM

[7:0]

N/A

Device Revision

A read of this register will return the device

revision number. This number is sequentially

incremented if the device design is updated.

Table 6 Device ID and Revision Number

GLOBAL ENABLE CONTROL

The WM8599 includes a number of enable and disable mechanisms to allow the device to be

powered on and off in a pop-free manner. A global enable control bit enables the ADC, DAC and

analogue paths. For full details of pop-free operation, see ‘Pop and Click Performance’ on page 40.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R12

ENABLE

0Ch

GLOBAL_

Device Global Enable

0 = ADC, DAC and PGA ramp control

circuitry disabled

1 = ADC, DAC and PGA ramp control

circuitry enabled

Table 7 Global Enable Control

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