WM8310 datasheet(108/291 Pages) WOLFSON

108 / 291 page

WM8310

Pre-Production

PP, May 2012, Rev 3.1

108

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16387

(4003h)

Power

State

5:4

USB100MA_START

UP [1:0

Sets the device behaviour when starting

up under USB power, when USB_ILIM

= 010 (100mA)

00 = Normal

01 = Soft-Start

10 = Only start if BATTVDD > 3.1V

11 = Only start if BATTVDD > 3.4V

In the 1X modes, if the battery voltage

is less than the selected threshold, then

the device will enable trickle charge

mode instead of executing the start-up

request. The start-up request is delayed

until the battery voltage threshold has

been met. Note that trickle charge is

only possible when CHG_ENA=1.

USB_CURR_STS

Indicates if the USB current limit has

been reached

0 = Normal

1 = USB current limit

2:0

USB_ILIM

010

Sets the USB current limit

000 = 0mA (USB switch is open)

001 = 2.5mA

010 = 100mA

011 = 500mA

100 = 900mA

101 = 1500mA

110 = 1800mA

111 = 550mA

Note that, when starting up the

WM8310 with the USBVDD supply

selected, the USB_ILIM register must

be set to 100mA or higher.

Table 55 Configuring the USB Power Operation

17.5 POWER PATH MANAGEMENT INTERRUPTS

The Power Path Management circuit is associated with three Interrupt event flags.

The PPM_SYSLO_EINT interrupt bit is set when the internal signal SYSLO is asserted. This indicates

a SYSVDD undervoltage condition, described in Section 24.4.

The PPM_PWR_SRC_EINT interrupt bit is set whenever the status of the Wall or USB supplies

changes, indicating a connection, disconnection, or a voltage. See Section 17.1.

The PPM_USB_CURR_EINT interrupt bit is set whenever the permitted USB current limit has been

reached. See Section 17.4.

Each of these secondary interrupts triggers a primary Power Path Management Interrupt, PPM_INT

(see Section 23). This can be masked by setting the mask bit(s) as described in Table 56.

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