WM8608 datasheet(44/54 Pages) WOLFSON

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WM8608

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PP Rev 1.5 March 2004

PWM OUTPUT CONFIGURATION

Two different PWM output formats are supported. These are:

•

CMOS or LVDS

•

Tri-state outputs to support power-down.

The PWM output format can be defined with the LVDS and PWMCFG setting defined in Table 47.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LVDS

Output PAD configuration

0 = CMOS

1 = LVDS

2:1

PWMCFG

[1:0]

PWM Output State for LVDS=0 when

output disabled or in standby mode:

01 = all PWM Outputs high

00 = all PWM Outputs low

10, 11 = high impedance

For LVDS=1 when output disabled or in

standby mode, the output state is high

impedance.

PWMPH

PWM Output Phase

0 = PWM outputs in phase

1 = PWM outputs phase shifted to each

other

R27 (1Bh)

PWM Output

Configuration

PWMCLK

PWM Output Clock

0 = disabled

1 = enabled

Table 47 PWM Output Configuration

OUTPUT CONFIGURATION

If required the WM8608 device can be disabled in a system by setting the TRI bit as defined in Table

48. Setting the TRI bit will set all output pins of the device to high impedance.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R28 (1Ch)

Output

Configuration

TRI

Output Pins Mode

0 = Normal

1 = High Impedance

Table 48 Output Configuration

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