WM8170 datasheet(35/41 Pages) WOLFSON

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WM8170

Product Preview Rev 1.0

WOLFSON MICROELECTRONICS LTD

PP Rev 1.0 March 2000

CONTROL BITS

DESCRIPTION

AUX DAC CONTROL (010000)

AUX1X1

Auxiliary DAC1 scaling factor.

AUX1X1

TIMES2

TIMES1

AUX2X1

Auxiliary DAC2 scaling factor.

AUX2X1

TIMES2

TIMES1

DC CORRECT CONTROL (001111)

ENINTBLC

Used to select between the BLCENB pin and the INTBLCENB pulse for the Analogue Loop Enable

ENINTBLC

BLCENB pin controls the Analogue Correction Loop

INTBLCENB pulse controls the Analogue Correction Loop

ENHD

Changes pin 26 between PBLK and HD functions

ENHD

Pin 26 is PBLK function

Pin 26 is HD function

ENVD

Changes pin 30 between PDB and VD functions

ENVD

Pin 30 is PDB function

Pin 30 is VD function

PGAUPD

Update the analogue control loop after PGA writes only

PGAUPD

Enable INTBLCENB Pulse to Analogue Loop on every frame.

Enable INTBLCENB Pulse to Analogue Loop only after PGA Register has been written to.

STPANAL

Stops the INTBLCENB signal from enabling the analogue control loop

STPANAL

INTBLCENB can be steered to the Analogue Loop Enable

INTBLC will be prevented from being steered to the Analogue Loop Enable, and will be used

for the IIR Filter Enable instead.

STPIIR

Stops the INTBLCENB signal from enabling the IIR filter

STPIIR

INTBLCENB can be steered to the IIR Filter Enable

INTBLC will be prevented from being steered to the IIR Filter Enable

ACON[1:0]

Used to control the function of the Area Pulse Generator

ACON1

ACON0

Area define signal turned off.

Area define signal used to update the internal register which holds the

error calculated by the IIR filter. In other conditions the internal register

which holds the error calculated by the IIR filter is enabled whenever the

IIR filter is enabled.

Area Define signal used to enable the Analogue DC Correction circuitry in

addition to the analogue enable generated from the INTBLCENB pulse

generator.

Area Define signal is used to enable the IIR filter in addition to the IIR filter

enable generated from the INTBLCENB pulse generator.

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