WM8281ECSSLASHR datasheet(245/392 Pages) CIRRUS

245 / 392 page

WM8281

Rev 4.0

245

GENERAL PURPOSE SWITCH

The WM8281 provides a General Purpose Switch, which can be used as a controllable analogue

switch for external functions. The switch is implemented between the GPSWA and GPSWB pins. Note

that this feature is entirely independent to the GPIOn pins.

The General Purpose Switch is configured using SW1_MODE. This register allows the switch to be

disabled, enabled, or synchronised to the MICDET Clamp status, as described in Table 95.

The switch is a bi-directional analogue switch, offering flexibility in the potential circuit applications.

Refer to the “Absolute Maximum Ratings” and “Electrical Characteristics” for further details.

The switch can be used in conjunction with the MICDET Clamp function, in order suppress pops and

clicks associated with jack insertion and removal. An example circuit is shown in Figure 64, within the

“External Accessory Detection” section. Note that the MICDET Clamp function must also be

configured appropriately when using this method of pop suppression control.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3096

(0C18h)

GP Switch 1

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

Table 95 General Purpose Switch control

WM8281ECS/R 데이터시트(PDF) 245 Page - Cirrus Logic