CS4525(2008) 데이터 시트보기 (PDF) - Cirrus Logic

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CS4525
(Rev.:2008)

30 W Digital Audio Amplifier with Integrated ADC

Cirrus Logic 

CS4525

The AttackDly[1:0] bits in the Foldback Cfg register allow the foldback attack delay timeout period to be

adjusted from approximately 0.5 seconds to approximately 2.0 seconds. The maximum attenuation ap-

plied by the thermal foldback algorithm can be restricted to -30 dB by setting the EnFloor bit in the same

register.

The foldback adjustment lock feature causes the attenuation applied by the foldback algorithm to be main-

tained after the foldback condition has subsided. The applied attenuation will continue to be applied until

the master volume or all active channel volume controls are lowered below the foldback attenuation level,

or until a subsequent foldback condition occurs causing the applied attenuation to be lowered further. If

the foldback algorithm applies attenuation while this feature is enabled, when the feature is subsequently

disabled, the applied attenuation will be gradually released as long as the temperature remains within the

safe operating range. This foldback lock adjustment feature is enabled by the LockAdj bit in the

Foldback Cfg register.

Thermal warnings will only affect the foldback algorithm and cause attenuation to be applied when en-

abled by the EnTherm bit in the Foldback Cfg register.

The CS4525 can be configured to accept an external thermal warning indicator input. When in this con-

figuration, an active input signal indicates that a thermal warning threshold has been exceeded. If thermal

foldback is enabled, the foldback algorithm will respond as described above making no distinction be-

tween an internal or external thermal warning condition. See “External Warning Input Port” on page 44 for

more information.

Referenced Control

Register Location

EnTherm ............................. “Enable Thermal Foldback (EnTherm)” on page 74

AttackDly[1:0] ...................... “Foldback Attack Delay (AttackDly[1:0])” on page 75

EnFloor................................ “Enable Foldback Floor (EnFloor)” on page 75

LockAdj ............................... “Lock Foldback Adjust (LockAdj)” on page 74

DS726PP3

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