CS47L35 datasheet(149/300 Pages) CIRRUS

149 / 300 page

DS1085F3

149

CS47L35

4.12 External Accessory Detection

The jack detect input debounce is selected using the JDn_DB bits, as described in Table 4-74. Note that, under normal

operating conditions, the debounce circuit uses the 32-kHz clock, which must be enabled whenever input debounce

functions are required. Input debounce is not provided in Sleep Mode; the JDn_DB bits have no effect in Sleep Mode.

Note that the jack detect signals, JD1 and JD2, can be used as inputs to the MICDET clamp function—this provides

additional functionality relating to jack insertion and removal events.

An interrupt request (IRQ) event is generated whenever a jack insertion or jack removal is detected (see Section 4.15).

Separate mask bits are provided, to allow IRQ events on the rising and/or falling edges of the JD1 or JD2 signals.

The control registers associated with the jack detect function are described in Table 4-74.

A recommended connection circuit, including headphone output on HPOUT and microphone connections, is shown in

Fig. 4-55. See Section 5.1 for details of recommended external components.

Table 4-74. Jack Detect Control

Bit

Label

Default

Description

R723 (0x02D3)

Jack_detect_

analog

JD2_ENA

JACKDET2 enable

0 = Disabled

1 = Enabled

JD1_ENA

JACKDET1 enable

0 = Disabled

1 = Enabled

R6278 (0x1886)

IRQ1_Raw_

Status_7

JD2_STS1

JACKDET2 input status

0 = Jack not detected

1 = Jack is detected

(Assumes the JACKDET2 pin is pulled low on jack insertion.)

JD1_STS1

JACKDET1 input status

0 = Jack not detected

1 = Jack is detected

(Assumes the JACKDET1 pin is pulled low on jack insertion.)

R6534 (0x1986)

IRQ2_Raw_

Status_7

JD2_STS2

JACKDET2 input status

0 = Jack not detected

1 = Jack is detected

(Assumes the JACKDET2 pin is pulled low on jack insertion.)

JD1_STS2

JACKDET1 input status

0 = Jack not detected

1 = Jack is detected

(Assumes the JACKDET1 pin is pulled low on jack insertion.)

R6662 (0x1A06)

Interrupt_

Debounce_7

JD2_DB

JACKDET2 input debounce

0 = Disabled

1 = Enabled

JD1_DB

JACKDET1 input debounce

0 = Disabled

1 = Enabled

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