WM8255 datasheet(5/49 Pages) CIRRUS

5 / 49 page

WM8255

Production Data

PD, Rev 4.7, August 2013

PIN DESCRIPTION

PINNO

NAME

TYPE

DESCRIPTION

MCLK

Digital input

Master clock. This clock is applied at N times the input pixel rate (N = 2, 3, 4, 6, 8 or

any multiple of 2 thereafter depending on input sample mode).

Digital multiplexed output data bus.

ADC output data (d15:d0) is available in a 4-bit multiplexed format as shown below.

A 2-bit multiplexed output is also available as described in the OUTPUT FORMATS

section of this datasheet on page 18.

OP[3]/SDO

Digital output

d15

d11

OP[2]

Digital output

d14

d10

OP[1]

Digital output

d13

OP[0]

Digital output

d12

Alternatively, pin OP[3]/SDO may be used to output register read-back data when

address bit 4=1 and SEN has been pulsed high. See Serial Interface description in

Device Description section for further details.

DVDD

Supply

Digital supply (3.3V)

DGND

Supply

Digital ground (0V).

EXTRES

Analogue input

External resistor connection for LED absolute current control. Must be connected to

ground via a suitable resistor.

VRB

Analogue output

Lower reference voltage.

This pin must be connected to AGND via a decoupling capacitor.

VRT

Analogue output

Upper reference voltage.

This pin must be connected to AGND via a decoupling capacitor.

VRX

Analogue output

Input return bias voltage

This pin must be connected to AGND via a decoupling capacitor.

No Connect

Not Connected.

AGND2

Supply

Analogue ground pin (0V)

AVDD2

Supply

Analogue supply (3.3V) Not required to be driven if AVDD1 is being used. A

decoupling capacitor must be connected to AGND.

VINP

Analogue input

Video input.

VRLC/VBIAS

Analogue I/O

Selectable analogue output voltage for RLC or single-ended bias reference.

This pin would typically be connected to AGND via a decoupling capacitor.

VRLC can be externally driven if programmed Hi-Z.

ILEDB

Analogue input

Blue LED pin

ILEDG

Analogue input

Green LED pin

ILEDR

Analogue input

Red LED pin

AVDD1

Supply

Analogue Supply (5.75V)

AGND1

Supply

Analogue ground (0V).

Digital input

Line synchronisation pulse

LEDSTART

Digital input

LED start pulse

No Connect

Not Connected.

SDI

Digital input

Serial data input.

SCK

Digital input

Serial clock

SEN

Digital input

Enables the serial interface when high.

VSMP

Digital input

Video sample synchronisation pulse.

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