PCM1861 datasheet(46/115 Pages) TI

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Interrupt

Generator

INT

Pulse Width

Energy sense

Clock Error Detector

DIN-Toggle

Status

Polarity

Control

Polarity

DC Level Change

Enable bits

Sticky registers

Clear bits

PCM1861, PCM1863, PCM1865

SLAS831C – MARCH 2014 – REVISED AUGUST 2014

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Interrupt Controller (continued)

The Software controlled devices have multiple signals that can be mapped to the interrupt outputs. These

include:

•

Energysense (DEFAULT)

•

Secondary ADC Controlsense Interrupt

•

Clock Error

•

DIN Toggle

The Interrupt controller has the following features

•

The Interrupt sources can be filtered by the enable register (INT_EN).

•

The Interrupt flags can be monitored by reading the status register (INT_STAT).

•

The interrupt flags can be cleared by writing the status register.

•

The polarity of the interrupt signal can be changed between active high, active low and Open Collector (High

Impedance is pulled to GND) (INT_PLS).

•

The pulse width of the interrupt signal can be changed between 1ms, 2ms, 3ms and Infinity (until the flag is

cleared).

Figure 43. Interrupt Logic

Using a combination of these features, as well as the interrupt sources, allows the PCM186x to alert a host

microcontroller of an event, using whichever polarity signal required (Pull High, Pull Low, Hiz-Open Collector).

The Host controller can then communicate with the device to poll the interrupt flag register to find out "what

happened". Additional registers can then be read for more details. (For instance, which input triggered an

Energysense event.)

8.20.1 Clock Error Detect

When a clock error occurs, the PCM186x starts the following sequence:

1. Mute audio output immediately (without volume ramp down)

2. Generate an interrupt if the clock error interrupt is enabled

3. Wait until proper clock is supplied (Known as "Clock Waiting State")

4. Restart the clock detection. The PLL and all clock dividers are reconfigured with the result of the detection.

5. Start Fade-IN

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Product Folder Links: PCM1861 PCM1863 PCM1865

PCM1861 Datasheet(PDF) 46 Page - Texas Instruments

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