CS42L52 datasheet(73/82 Pages) CIRRUS

73 / 82 page

DS680A1

CS42L52

6.39.2 SPKR/HP Pin Status (Read Only)

Indicates the status of the SPKR/HP pin.

6.39.3 Thermal Warning Status (Read Only)

Indicates whether or not the CODEC’s die temperature is approaching thermal error status.

6.39.4 Thermal Error Status (Read Only)

Indicates whether or not the CODEC’s die temperature has exceeded safe temperatures.

6.40 Temperature Monitor Control (Address 32h)

6.40.1 Temperature Acknowledge & Release

User-acknowledge input allowing the speaker output to resume normal operation after an automatic ther-

mal-error-shutdown (“Thermal Error Status (Read Only)” on page 73).

Note:

When temperatures exceed the TERRTHR[2:0] and the speaker outputs power down, this bit

must first be toggled from ‘0’b to ‘1’b and then back to ‘0’b before the speaker powers up and resumes

normal operation.

6.40.2 Thermal Foldback (Address 33h)

6.40.3 Thermal Foldback

Configures automatic adjustment of the speaker volume when the die temperature is approaching thermal

error status.

Note:

If THRFLD is enabled and subsequently disabled when a thermal warning (indicated by TWRN)

is in progress, future automatic attenuation (specified in SPKATTN) is disabled but the current automatic

attenuation may remain for as long as ~512 ms before returning to the volume specified in SPKxVOL[7:0].

SPKR/HP

Pin State

Pulled Low

Pulled High

TWRN

Thermal Status

Die temperature has not approached thermal error status.

Die temperature is approaching thermal error status.

TERR

Thermal Status

Die temperature is within safe operating limits

Die temperature has reached unsafe levels; Speaker outputs will shut down immediately.

432

RELEASE

Reserved

RELEASE

User Action

Remove automatic speaker-shutdown after thermal error is acknowledged

Acknowledge thermal error

432

Reserved

THRFLD

SPKATTN2

SPKATTN1

SPKATTN0

THRFLD

Automatic Speaker Attenuation

Disabled

Enabled

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