WM8351 datasheet(149/330 Pages) WOLFSON

149 / 330 page

Production Data

WM8351

PD, April 2012, Rev 4.5

149

16.2.4

ON/OFF RAMP TIMING

The sink current for ISINKA can be programmed to switch on and off gradually in LED and in Flash

modes. The current ramp duration is as described in Table 99.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R173 (ADh)

CSA Flash

Contro

5:4

CS1_OFF_RA

MP [1:0]

Switch-off ramp duration

LED Mode

Flash Mode

00 = instant (no

ramp)

01 = 0.25s

10 = 0.5s

11 = 1s

00 = instant (no

ramp)

01 = 1.95ms

10 = 3.91ms

11 = 7.8ms

1:0

CS1_ON_RAM

P [1:0]

Switch-on ramp duration

Similar to CS1_OFF_RAMP

Table 99 Configuring On/Off Ramp Timing for ISINKA

16.2.5

INTERRUPTS AND FAULT PROTECTION

The Current Sink has its own first-level interrupt, CS_INT (see Section 24). This contains a single

second-level interrupt, CS1_EINT, indicating that the Current Sink is unable to sink the amount of

current that has been programmed and may be out of spec. CS1_EINT can be masked by setting the

IM_CS1_EINT bit.

ADDRESS

BIT

LABEL

DESCRIPTION

R26 (1Ah)

Interrupt Status

CS1_EINT

Flag to indicate drain voltage can no

longer be regulated and output current

may be out of spec.

(Rising Edge triggered)

Note: This bit is cleared once read.

R34 (22h)

Interrupt Status

2 Mask

IM_CS1_EINT

Mask bit for Current Sink over-current

interrupt

When set to 1, IM_CS1_EINT masks

CS1_EINT in R26 and does not trigger a

CS_INT interrupt when CS1_EINT is set.

Table 100 Current Sink Interrupts

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