CS47L85 datasheet(255/370 Pages) CIRRUS

255 / 370 page

CS47L85

Rev 4.3

255

ASYNCHRONOUS SAMPLE RATE CONVERTER (ASRC) LOCK STATUS OUTPUT

GPn_FN = 088h, 089h, 08Ah, 08Bh.

The CS47L85 maintains a flag indicating the lock status of the Asynchronous Sample Rate Converters (ASRCs), which may

be used to control other events if required. See “Digital Core” for more details of the ASRCs.

The ASRC Lock signals may be output directly on a GPIO pin by setting the respective GPIO registers as described in

“GPIO Control”.

The ASRC Lock signals are inputs to the Interrupt control circuit. An interrupt event is triggered on the rising and falling

edges of the ASRC Lock signals. The associated interrupt bits are latched once set; they can be polled at any time or used

to control the IRQ

signal. See “Interrupts” for more details of the Interrupt event handling.

OVER-TEMPERATURE, SHORT CIRCUIT PROTECTION, AND SPEAKER SHUTDOWN STATUS

OUTPUT

GPn_FN = 0B6h, 0B7h, 0E0h, 0E1h, 0E2h.

The CS47L85 incorporates a temperature sensor which detects when the device temperature is within normal limits or if the

device is approaching a hazardous temperature condition.

The temperature status may be output directly on a

GPIO pin by setting the respective GPIO registers as described in “GPIO

Control

”. A GPIO pin can be used to indicate either an Overheat Warning Temperature event or an Overheat Shutdown

Temperature event.

The CS47L85 provides short circuit protection on the Class D speaker outputs, and on each of the headphone output paths.

The status of the Class D speaker short circuit detection circuits may be output directly on a GPIO pin by setting the

respective GPIO registers as described in “GPIO Control”.

If the Overheat Shutdown Temperature is exceeded, or if a short circuit is detected on the Class D speaker outputs, then

the Class D speaker outputs will automatically be disabled in order to protect the device. The General Purpose Timers can

be used as a Watchdog function to trigger a shutdown of the Class D speaker drivers. Further details of the Speaker

Shutdown functions are described in the “Thermal Shutdown and Short Circuit Protection” section. When the speaker driver

shutdown is complete, the Speaker Shutdown signal will be asserted. The speaker driver shutdown status can also be output

directly on a GPIO pin.

The Overtemperature, Short Circuit protection, and Speaker Shutdown status flags are inputs to the Interrupt control circuit.

An interrupt event may be triggered on the applicable edges of these signals. The associated interrupt bit is latched once

set; it can be polled at any time or used to control the IRQ signal. See “Interrupts” for more details of the Interrupt event

handling.

GENERAL PURPOSE TIMER STATUS OUTPUT

GPn_FN = 140h, 141h, 142h, 143h, 144h, 145h, 146h, 147h.

The General Purpose Timers can count up or down, and support continuous or single count modes. Status outputs indicating

the progress of these timers are provided. See “DSP Peripheral Control” for details of the General Purpose Timers.

A logic signal from the General Purpose Timers may be output directly on a GPIO pin by setting the respective GPIO

registers as described in “GPIO Control”. This logic signal is pulsed high whenever the respective Timer reaches its final

count value.

The General Purpose Timers also provide inputs to the Interrupt control circuit. An interrupt event is triggered whenever the

respective Timer reaches its final count value. The associated interrupt bits are latched once set; they can be polled at any

time or used to control the IRQ signal. See “Interrupts” for more details of the Interrupt event handling.

CS47L85 Datasheet(PDF) 255 Page - Cirrus Logic

CS47L85 Datasheet(HTML) 255 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL