WM8352 datasheet(160/336 Pages) WOLFSON

160 / 336 page

WM8352

Production Data

PD, February 2011, Rev 4.4

160

If the USB current limit cannot support the charge current demanded by CHG_TRICKLE_SEL and

USB current choking is enabled, then the charge current will be modified, where possible, in order to

continue charging. The trickle charge current cannot be controlled dynamically - the only possible

charge currents are 50mA or 100mA. Therefore, the only form of USB choking in trickle charge mode

is for a demanded current of 100mA to be reduced to 50mA. Trickle charge USB current choking is

controlled by the CHG_TRICKLE_USB_CHOKE register bit. The time constant for the charger’s

attempts to increase the current after USB choking can be controlled by CHG_RECOVERY_T.

The register control fields for Trickle Charging are described in Table 105. See Section 17.7.5 for

details of battery charger termination.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R168 (A8h)

Battery charger

control 1

CHG_TRICKLE

_TEMP_CHOK

Enable trickle charge temperature

choking

0 = disable

1 = enable

Protected by security key.

CHG_TRICKLE

_USB_CHOKE

Enable USB current choking in trickle

charge

0 = disable

1 = enable

Protected by security key.

CHG_RECOVE

R_T

Time constant adjust for charger choke

recovery (step-up):

0 = Step-up time constant is 180us

(allows faster recovery between

processor wakeups)

1 = Step-up time constant is >20ms

(outside audio band)

Protected by security key.

R169 (A9h)

Battery charger

control 2

CHG_TRICKLE

_SEL

Selects the trickle charge current.

0 = Set the trickle charge current to

50mA.

1 = Set the trickle charge current to

100mA.

Protected by security key.

R170 (AAh)

Battery charger

control 3

CHG_FRC

Allows trickle-charging to be forced even

if the battery voltage is above the default

threshold

0 = only trickle-charge if the battery

voltage is below CHG_VSEL - 100mV

1 = always trickle-charge

Protected by security key.

Table 105 Trickle Charging Control

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