WM8311 datasheet(110/302 Pages) WOLFSON

110 / 302 page

WM8311

Pre-Production

PP, May 2012, Rev 3.1

110

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

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

WM8311 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.

ADDRESS

BIT

LABEL

DESCRIPTION

R16401

(4011h)

Interrupt Status

PPM_SYSLO_EINT

Power Path SYSLO interrupt

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

PPM_PWR_SRC_EINT

Power Path Source interrupt

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

PPM_USB_CURR_EINT

Power Path USB Current interrupt

(Rising Edge triggered)

Note: Cleared when a ‘1’ is written.

R16409

(4019h)

Interrupt Status

1 Mask

IM_PPM_SYSLO_EINT

Interrupt mask.

0 = Do not mask interrupt.

1 = Mask interrupt.

Default value is 1 (masked)

WM8311 Datasheet(PDF) 110 Page - Wolfson Microelectronics plc

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