WM8956 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

WM8956

Hi-Fi DAC with 1W Stereo Class D Speaker Drivers and Headphone Drivers

Cirrus Logic 

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Production Data

WM8956

THERMAL SHUTDOWN

The speaker and headphone outputs can drive very large currents. To protect the WM8956 from

overheating a thermal shutdown circuit is included and is enabled by default. If the device

temperature reaches approximately 1500C and the thermal shutdown circuit is enabled (TSDEN = 1;

TSENSEN = 1) the speaker and headphone amplifiers (HP_L, HP_R, SPK_LP, SPK_LN, SPK_RP,

SPK_RN and OUT3) will be disabled. This feature can be disabled to save power when the device is

in standby mode.

TSENSEN must be set to 1 to enable the temperature sensor when using the TSDEN thermal

shutdown function. The output of the temperature sensor can also be output to the GPIO1 pin.

REGISTER

ADDRESS

R23 (17h)

Additional

Control (1)

BIT

LABEL

8

TSDEN

R48 (30h)

1

TSENSEN

Additional

Control (4)

Table 25 Thermal Shutdown

DEFAULT

DESCRIPTION

1

Thermal Shutdown Enable

0 = Thermal shutdown disabled

1 = Thermal shutdown enabled

(TSENSEN must be enabled for this

function to work)

1

Temperature Sensor Enable

0 = Temperature sensor disabled

1 = Temperature sensor enabled

GENERAL PURPOSE INPUT/OUTPUT

The WM8956 has two dual purpose GPIO pins and one dedicated GPIO pin.

 LINPUT3/JD2: Analogue input or headphone detect input.

 RINPUT3/JD3: Analogue input or headphone detect input.

 GPIO1: GPIO pin.

The GPIO1 pin can be configured as a headphone detect input, or one of a number of GPIO output

functions as shown in Table 26.

The default configuration for the LINPUT3 and RINPUT2 pins is to be analogue inputs. The

ALRCGPIO bit must be set to enable GPIO1 pin to operate as a GPIO.

w

PD, November 2011, Rev 4.1

41

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