WM8310 datasheet(138/291 Pages) WOLFSON

138 / 291 page

WM8310

Pre-Production

PP, May 2012, Rev 3.1

138

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 81.

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 81 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 82.

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 82 System Status LED Outputs - Charger Status

22.2.4

LED DRIVER MANUAL MODE

Setting LEDn_SRC = 11 configures the associated LED to operate in Manual Mode, which is further

configurable using additional register fields.

In Manual Mode, the LED output can be commanded as Off, On (Constant), Continuous Pulsed or

Pulsed Sequence. The selected operation is determined by the LEDn_MODE registers as described

in Table 83.

In Continuous Pulsed mode and Pulsed Sequence mode, the ‘On’ time and the Duty Cycle can be

configured using the LEDn_DUR and LEDn_DUTY_CYC registers respectively.

In Pulsed Sequence mode, the number of pulses in the sequence can be selected using the

LEDn_SEQ_LEN register. On completion of the commanded number of pulses, the LED remains off

until LEDn_MODE or LEDn_SRC is changed to another value.

WM8310 Datasheet(PDF) 138 Page - Wolfson Microelectronics plc

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