CS47L85 datasheet(342/370 Pages) CIRRUS

342 / 370 page

CS47L85

342

Rev 4.3

output driver. Note that the respective output driver will continue to operate, but the output is current-limited.

The headphone output short circuit detection provides inputs to the Interrupt control circuit and can be used to trigger an

Interrupt event when a short circuit condition is detected - see

“Interrupts”.

The General Purpose Timers (see “DSP Peripheral Control”) can also be used to trigger a shutdown of the Class D speaker

drivers. This is configured using the SPK_SHUTDOWN_TIMER_SEL register field, as described in Table 131.

If one of the General Purpose Timers is selected for the Speaker Shutdown function, and the respective Timer reaches its

final count value, then the Class D speaker drivers will automatically be disabled. When the driver shutdown is complete, an

interrupt event (SPK_SHUTDOWN_EINTn) will be signalled.

To enable the Class D speaker outputs following a Timeout condition, the host processor must disable and re-enable the

output driver(s).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R620

(026Dh)

SPK_Wat

chdog_1

3:0

SPK_SHUTDO

WN_TIMER_SE

L [3:0]

Speaker Shutdown Timer select

0h = Disabled

1h = Timer 1

2h = Timer 2

3h = Timer 3

4h = Timer 4

5h = Timer 5

6h = Timer 6

7h = Timer 7

8h = Timer 8

All other codes are Reserved

Table 131 Speaker Shutdown - Timer Control

The Thermal status, Class D Speaker Short Circuit protection, and Class D Speaker shutdown flags can be output directly

on a GPIO pin as an external indication of the associated events. See

“General Purpose Input / Output” to configure a GPIO

pin for this function.

CS47L85 Datasheet(PDF) 342 Page - Cirrus Logic

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