WM8352 datasheet(155/336 Pages) WOLFSON

155 / 336 page

Production Data

WM8352

PD, February 2011, Rev 4.4

155

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R4 (04h)

System

Control 2

USB_SUSPEND

Opens the USB switch

0 = USB enabled

1 = USB suspended

The register bit defaults to 0, when a

reset happens or LINE < UVLO or the

system fail on boot due to the upper

limit of the Hysteresis Comp not being

met.

USB_MSTR

Set the chip to be a USB master

0 = Slave

1 = Master

The register bit defaults to 0, when a

reset happens or the USB state

machine moves from MASTER mode to

SLAVE mode.

USB_MSTR_500MA

Set 500mA or 100mA mode when the

USB switch is in master mode

0 = 100mA

1 = 500mA

USB_SLV_500MA

Dependant

on CONFIG

settings

Set 500mA or 100mA mode when the

USB switch is in slave mode

0 = 100mA

1 = 500mA

The register bit defaults to 0, when a

reset happens or LINE<UVLO or the

system fail on boot due to the upper

limit of the Hysteresis Comp not been

met.

Table 101 Selecting USB Power Modes

The USB connection has its own first-level interrupt, USB_INT (see Section 24). This contains a

single second-level interrupt, USB_LIMIT_EINT, which indicates an over-current condition.

USB_LIMIT_EINT can be masked by setting the IM_USB_LIMIT_EINT bit.

USB Current monitoring is effective in USB Master and USB Slave Modes. The current limit

threshold is determined by USB_MSTR_500MA (in USB Master Mode) or USB_SLV_500MA (in USB

Slave Mode).

ADDRESS

BIT

LABEL

DESCRIPTION

R26 (1Ah)

Interrupt

Status 2

USB_LIMIT_EINT

USB Limit Switch interrupt.

(Rising Edge triggered)

Note: This bit is cleared once read.

R34 (22h)

Interrupt

Status 2 Mask

IM_USB_LIMIT_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

When IM_USB_LIMIT_EINT is set to 1,

then USB_LIMIT_EINT in R26 does not

trigger an USB_INT interrupt when set.

The default value is 0 (unmasked).

Table 102 USB Interrupt

WM8352 Datasheet(PDF) 155 Page - Wolfson Microelectronics plc

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