CS47L35 datasheet(148/300 Pages) CIRRUS

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DS1085F3

CS47L35

4.12 External Accessory Detection

Figure 4-54. Digital Speaker (PDM) Connection

4.12 External Accessory Detection

The CS47L35 provides external accessory detection functions that can sense the presence and impedance of external

components. This can be used to detect the insertion or removal of an external headphone or headset, and to provide an

indication of key/button push events.

Jack insertion is detected using the JACKDET1 and JACKDET2 pins, which must be connected to a switch contact within

the jack sockets. An interrupt event is generated whenever a jack insertion or jack removal event is detected.

Suppression of pops and clicks caused by jack insertion or removal is provided using the MICDET clamp function. This

function can also be used to trigger interrupt events, and/or to trigger the control-write sequencer. The integrated

general-purpose switch can be synchronized with the MICDET clamp, to provide additional pop suppression capability.

Microphones, push buttons, and other accessories can be detected via the MICDET1 or MICDET2 pins. The presence of

a microphone, and the status of a hook switch can be detected. This feature can also be used to detect push-button

operation.

Headphone impedance can be detected via the HPDETL and HPDETR pins; this can be used to set different gain levels

or other configuration settings according to the type of load connected. For example, different settings may be applicable

to headphone or line output loads.

The MICVDD power domain must be enabled when using the microphone detect function. (Note that MICVDD is not

required for the jack detect or headphone detect functions.) The MICVDD power domain is provided using an internal

charge pump (CP2) and LDO regulator (LDO2). See Section 4.19 for details of these circuits.

The internal 32-kHz clock must be present and enabled when using the microphone detect or headphone detect functions;

the 32-kHz clock is also required for the jack detect function, assuming input debounce is enabled. See Section 4.16 for

details of the internal 32-kHz clock and associated control fields.

4.12.1 Jack Detect

The CS47L35 provides support for jack insertion switch detection. The jack insertion status can be read using the relevant

The jack-detect interrupt (IRQ) functionality is maintained in Sleep Mode (see Section 4.13). This enables a jack insertion

event to be used to trigger a wake-up of the CS47L35.

Jack insertion and removal is detected using the JACKDET1 and JACKDET2 pins. The recommended external

connections are shown in Fig. 4-55. Note that the logic thresholds associated with the two JACKDET differ from each

other, as described in Table 3-11—this provides support for different jack switch configurations.

The jack detect feature is enabled using the JDn_ENA bits (where n = 1 or 2 for JACKDET1 or JACKDET2 respectively);

the jack insertion status can be read using JDn_STSx. Note that the JDn_STS1 and JDn_STS2 bits provide the same

information in respect of the applicable JACKDETn input.

Speaker Driver

Right

Left

SPKCLK

SPKDAT

CS47L35

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