CS42L52 Datasheet, PDF (73/82 Pages) Cirrus Logic – Low Power, Stereo CODEC w/Headphone & Speaker Amps

6.39.2 SPKR/HP Pin Status (Read Only)
Indicates the status of the SPKR/HP pin.
SPKR/HP
0
1
Pin State
Pulled Low
Pulled High
CS42L52
6.39.3 Thermal Warning Status (Read Only)
Indicates whether or not the CODEC’s die temperature is approaching thermal error status.
TWRN
0
1
Thermal Status
Die temperature has not approached thermal error status.
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.
TERR
0
1
Thermal Status
Die temperature is within safe operating limits
Die temperature has reached unsafe levels; Speaker outputs will shut down immediately.
6.40 Temperature Monitor Control (Address 32h)
7
RELEASE
6
Reserved
5
Reserved
4
Reserved
3
Reserved
2
Reserved
1
Reserved
0
Reserved
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).
RELEASE
0
1
User Action
Remove automatic speaker-shutdown after thermal error is acknowledged
Acknowledge thermal error
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)
7
Reserved
6
Reserved
5
Reserved
4
Reserved
3
THRFLD
2
SPKATTN2
1
SPKATTN1
0
SPKATTN0
6.40.3 Thermal Foldback
Configures automatic adjustment of the speaker volume when the die temperature is approaching thermal
error status.
THRFLD
0
1
Automatic Speaker Attenuation
Disabled
Enabled
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].
DS680A1
73