CS4525 datasheet(69/91 Pages) CIRRUS

69 / 91 page

DS726A1

CS4525

only be changed while all modulators and associated logic are in the power-down state (the PDnAll bit is

set). Attempts to write these bits while the PDnAll bit is cleared will be ignored. See “PWM Channel Delay”

on page 50 for more information.

9.5

Foldback and Ramp Configuration (Address 05h)

9.5.1

Enable Thermal Foldback (EnTherm)

Default = 0

Function:

Enables the thermal foldback feature. See “Thermal Foldback” on page 39 for more information.

9.5.2

Lock Foldback Adjust (LockAdj)

Default = 0

Function:

Controls the operation of the foldback lock adjustment feature. See “Thermal Foldback” on page 39 for

more information.

9.5.3

Foldback Attack Delay (AttackDly[1:0])

Default = 01

Function:

Controls the foldback attack delay. See “Thermal Foldback” on page 39 for more information.

OutputDly[3:0] Setting

Output Delay in Input Clock Source Cycles

0000 .................................... 0 - No Delay

0001 .................................... 1

0010 .................................... 2

....................................

1000 .................................... 8

....................................

1111 ..................................... 15 - Max Delay

432

Reserved

EnTherm

LockAdj

AttackDly1

AttackDly0

EnFloor

RmpSpeed1

RmpSpeed0

EnTherm Setting

Thermal Foldback State

0 .......................................... Disabled.

1 .......................................... Enabled.

LockAdj Setting

Foldback Adjustment Lock State

0 .......................................... Attenuation lock disabled.

1 .......................................... Attenuation lock enabled.

AttackDly[1:0] Setting

Foldback Attack Time

00 ........................................ Approximately 0.5 seconds.

01 ........................................ Approximately 1.0 seconds.

10 ........................................ Approximately 1.5 seconds.

11......................................... Approximately 2.0 seconds.

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