CS5550 datasheet(19/24 Pages) CIRRUS

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CS5550

DS630F1

as well as the other defined power states of the

CS5550, are described in Section 4.6).

Refer to Section 5 of the data sheet to see the de-

fault register values for any particular device regis-

ter.

4.5 Serial Port Initialization

It is possible for the serial interface to become un-

synchronized, with respect to the SCLK input. If

this occurs, any attempt to clock valid CS5550

commands into the serial interface will result in ei-

ther no operation or unexpected operation, be-

cause the CS5550 will not interpret the input

command bits correctly. The CS5550’s serial port

must then be re-initialized. To initialize the serial

port, any of the following actions can be performed:

1) Drive (assert) the CS pin low [or if CS pin is al-

ready low, drive the pin high, then back to low].

2) Hardware Reset (drive RESET pin low, for at

least 10 µs, then drive back to high).

3) Issue the Serial Port Initialization Sequence,

which is performed by clocking 3 (or more)

SYNC1 command bytes (0xFF) followed by

one SYNC0 command byte (0xFE).

4.6 CS5550 Power States

Active state denotes the operation of CS5550

when the device is fully powered on (not in sleep

state or stand-by state). Performing either of the

following actions will insure that the CS5550 is op-

erating in the active state:

1) Power on the CS5550. (Or if the device is al-

ready powered on, recycle the power.)

2) Software Reset

3) Hardware Reset

In addition to the actions listed above, note that if

the device is in sleep state or in stand-by state, the

action of waking up the device out of sleep state or

stand-by state (by issuing the Power-Up/Halt com-

mand) will also insure that the device is set into ac-

tive state. In order to send the Power-Up/Halt

command to the device, the serial port must be ini-

tialized. Therefore, after applying power to the

CS5550, a hardware reset should always be per-

formed.

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