WM8321 datasheet(49/253 Pages) WOLFSON

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Production Data

WM8321

PD, February 2012, Rev 4.0

14 INSTANTCONFIG™ (ICE) AND OTP MEMORY CONTROL

14.1 GENERAL DESCRIPTION

The WM8321 is a highly configurable device which can be tailored specifically to the requirements of

a complex system application. The sequencing and voltage control of the integrated DC-DC

Converters and LDOs in power-up, shut-down and SLEEP conditions is crucial to the robust operation

of the application.

In development, the WM8321 allows designers to modify or experiment with different settings of the

control sequences by writing to the applicable registers in the OFF state prior to commanding an ‘ON’

state transition. Configuration settings can also be stored on an external EEPROM and loaded onto

the WM8321 as required, using the InstantConfig™ EEPROM (ICE) interface.

For production use, the WM8321 provides an on-chip One-Time Programmable (OTP) memory, in

which the essential parameters for starting up the device can be programmed. This allows the

WM8321 to start up and shut down the system with no dependency on any other devices for

application-specific configuration parameters.

14.2 ICE AND OTP MEMORY DEFINITION

An illustration of the WM8321 memory locations is shown in Figure 18. The main Register Map of the

WM8321 contains a block of data in a ‘Window’ area which is mirrored in the OTP and/or the ICE

Memory. Data from the external ICE Memory can be loaded into the Window area. Data can be

transferred from the Window into OTP Memory and also from the OTP Memory into the Window. The

Window is called the Device Configuration Register Window (DCRW); the data in this Window is

mirrored in other locations within the WM8321 Register Map.

Figure 18 ICE and OTP Memory Layout

The DCRW contains 5 pages of data, as illustrated in Figure 18.

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