CS47L85 datasheet(232/370 Pages) CIRRUS

232 / 370 page

CS47L85

232

Rev 4.3

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R712

(02C8h)

GP_Switch_

1:0

SW1_MODE [1:0]

General Purpose Switch control

00 = Disabled (open)

01 = Enabled (closed)

10 = Enabled when MICDET Clamp is

active

11 = Enabled when MICDET Clamp is

not active

R6278

(1886h)

IRQ1_Raw_

Status_7

MICD_CLAMP_S

TS1

MICDET Clamp status

0 = Clamp not active

1 = Clamp active

R6534

(1986h)

IRQ2_Raw_

Status_7

MICD_CLAMP_S

TS2

MICDET Clamp status

0 = Clamp not active

1 = Clamp active

R6662

(1A06h)

Interrupt_De

bounce_7

MICD_CLAMP_D

MICDET Clamp de-bounce

0 = Disabled

1 = Enabled

Table 86 MICDET Clamp and General Purpose Switch control

CONTROL SEQUENCE FOR JACK DETECT & MICDET CLAMP

A summary of the Jack Detect and MICDET Clamp functionality, and their recommended usage in typical applications, is

described below.

On device power-up, and following reset, the MICDET Clamp will be active, due to the default setting of MICD_CLAMP_OVD;

this ensures no spurious output can occur during jack insertion.

It is recommended to keep the MICDET Clamp active (MICD_CLAMP_OVD = 1) until after a jack insertion has been detected.

The MICDET_CLAMP_MODE field should be set according to the applicable JD1/JD2 signal configuration (configured to

assert the clamp when jack is removed).

Jack insertion is indicated using the JD1/JD2 signals; the associated status bits can be read directly, or associated signals

can be unmasked as inputs to the Interrupt controller.

After jack insertion has been detected, the applicable headset functions (headphone, microphone, accessory detect) may

then be enabled.

If the headset function requires MICBIAS to be enabled on the respective jack, then the MICDET Clamp should be disabled

(MICD_CLAMP_OVD = 0) immediately before enabling the MICBIAS (or immediately before enabling MICD_ENA). Note

that, if MICBIAS is not required on the respective jack, then the clamp should not be disabled (e.g., for headphone-only

operation).

Assuming that the MICDET_CLAMP_MODE field has been correctly set for the applicable JD1/JD2 signal configuration, the

clamp controller will provide indication of a jack removal. (The status bits can be read directly, or can be unmasked as inputs

to the Interrupt controller.) The clamp will also ensure fast and automatic silencing of the jack outputs.

Under typical use cases, the respective MICBIAS generator and headset audio paths should all be disabled following jack

removal.

Lastly, the MICD Clamp override bit should be asserted (MICD_CLAMP_OVD = 1), to make the system ready for a jack

insertion.

CS47L85 Datasheet(PDF) 232 Page - Cirrus Logic

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