WM8351 datasheet(154/330 Pages) WOLFSON

154 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

154

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 been

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

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

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

WM8351 데이터시트(PDF) 154 Page - Wolfson Microelectronics plc

WM8351 데이터시트(HTML) 154 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

데이터시트 다운로드

링크 URL