WM8311 datasheet(149/302 Pages) WOLFSON

149 / 302 page

Pre-Production

WM8311

PP, May 2012, Rev 3.1

149

22.2.2 POWER STATE STATUS

Setting LEDn_SRC = 01 configures the associated LED to indicate Power State status. Under this

selection, four different conditions may be indicated, as defined in Table 86.

LED DRIVER

DESCRIPTION

DRIVE MODE

LED ‘ON’

TIME

ON:OFF

DUTY CYCLE

LED1 or

LED2

Power Sequence Failure

Pulsed sequence

(4 pulses)

1:1

SYSVDD Low

Continuous

pulsed

250ms

1:3

ON state

Constant

n/a

SLEEP state

Continuous

pulsed

250ms

1:7

Table 86 System Status LED Outputs - Power State Status

If more than one of the conditions listed occurs simultaneously, then the LED output pattern is

controlled by the condition in the highest position within the list above.

For example, if the SYSVDD Low condition occurs while in the ON or SLEEP states, then the LED

output follows the pattern defined for the SYSVDD Low condition.

The SYSVDD Low indication is asserted if SYSVDD is less than the user-selectable threshold

SYSLO_THR, as described in Section 24.4.

Note that, in the case of Power Sequence Failure, the transition to OFF occurs after the 4 LED pulses

have been emitted.

22.2.3 CHARGER STATUS

Setting LEDn_SRC = 10 configures the associated LED to indicate Battery Charger status. Under this

selection, two different conditions may be indicated, as defined in Table 87.

LED DRIVER

DESCRIPTION

DRIVE MODE

LED ‘ON’

TIME

ON:OFF

DUTY CYCLE

LED1 or

LED2

Charger Complete

Constant

n/a

Charger On

Continuous

pulsed

1:2

Table 87 System Status LED Outputs - Charger Status

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