CS47L35 datasheet(150/300 Pages) CIRRUS

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150

DS1085F3

CS47L35

4.12 External Accessory Detection

Figure 4-55. Jack Detect and External Accessory Connections

The internal comparator circuit used to detect the JACKDETn status is shown in Fig. 4-56. The threshold voltages for the

jack detect circuit are noted in Table 3-11. Note that separate thresholds are defined for jack insertion and removal.

Figure 4-56. Jack Detect Comparator

4.12.2 Jack Pop Suppression (MICDET Clamp and GP Switch)

Under typical configuration of a 3.5-mm headphone/accessory jack connection, there is a risk of pops and clicks arising

from jack insertion or removal. This can occur when the headphone load makes momentary contact with the MICBIAS

output when the jack is not fully inserted.

The CS47L35 provides a MICDET clamp function to suppress pops and clicks caused by jack insertion or removal. It can

be controlled directly, or can be activated by a configurable logic function derived from external logic inputs. The clamp

status can be read using the relevant register status bit. The clamp status can also be used to trigger an interrupt (IRQ)

event or to trigger the control-write sequencer.

HPOUTL

HPOUTR

HPOUTFB1

JACKDETn

MICDET1

Note: The illustrated circuit

assumes the jack insertion

switch contacts are closed

when the jack is inserted.

* Note that the IN1Bxx analog mic

channels are recommended with the

external accessory detect function

(jack insertion switch )

MICBIASnx

2.2 k

(±2%)

* IN1BLP, IN1BRP

CS47L35

JACKDETn

reference

AVDD

Jack Detect logic



(jack insertion switch )

Note: The illustrated circuit

assumes the jack insertion

switch contacts are closed

when jack is inserted.

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