WM8351 datasheet(131/330 Pages) WOLFSON

131 / 330 page

Production Data

WM8351

PD, April 2012, Rev 4.5

131

The DC2_ILIM bits defined in Table 77 should be set according to the intended output load

conditions.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R183 (B7h)

DC-DC2 Control

DC2_MODE

DC-DC2 Converter Mode

0 = boost mode

1 = switch mode

DC2_ILIM

DC-DC2 peak current limit select

0 = Higher peak current

1 = Lower peak current

4:3

DC2_RMPH

DC2_RMPL

DC-DC2 compensation ramp

{DC2_RMPH, DC2_RMPL}

00 = 20V < VOUT ≤ 30V

01 = 10V < VOUT ≤ 20V

10 = 5V < VOUT ≤ 10V

11 = VOUT ≤ 5V (will be chosen

automatically if DC2_FBSRC=11)

1:0

DC2_FBSRC

[1:0]

DC-DCn voltage feedback selection

00 = voltage feedback (using external

resistor divider on pin FBn)

01 = current sink ISINKA used as

feedback

10 = Reserved

11 = voltage feedback (using internal

resistor divider on pin USB)

Table 77 Operating Mode Control for DC-DC Converter 2

DC-DC Converter 2 can also be controlled by the device HIBERNATE bit, or by hardware input

signals L_PWR1, L_PWR2 and L_PWR3. Several GPIO pins can be assigned as L_PWR pins. The

converter can be assigned to one of these three signals, or else to the device HIBERNATE bit. The

signals are active high and the converter’s response to the selected signal is programmable as

defined in Table 78.

Note that, when a GPIO pin is configured as a Hibernate input pin, and this input is asserted, then all

DC-DC Converters will be placed in Hibernate mode.

In order to use GPIO pins as L_PWR pins, they must be configured by setting the respective

GPn_FN, and GPn_DIR bits to the appropriate value (see Section 20).

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