WM8170 datasheet(27/41 Pages) WOLFSON

27 / 41 page

WM8170

Product Preview Rev 1.0

WOLFSON MICROELECTRONICS LTD

PP Rev 1.0 March 2000

USING THE AREA PULSE GENERATOR

The area defining pulse can be used under control of the ACON register bits to enable various

functions as detailed in the Table 10:

ACON1

ACON0

FUNCTION

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.

Table 10 ACON[1:0] control bits operation

VIEWING THE INTERNALLY GENERATED PULSES ON THE PTDO PIN

For system debug purposes all the internally generated pulses can be multiplexed onto the PTDO

signal pin, under control of the PTDO[2:0] register bits as described in the Table 11:

PTDO2

PTDO1

PTDO0

PTDO PIN FUNCTION

Programmable Threshold Detect Output

ADC Out of Range Signal

Clip 1 Error – Digital correction error (ADC

output is outside the digital correction range)

BLCENB Error – caused by BLCENB going

high before the internal DC offset correction

circuitry associated with the analogue DC

correction loop has finished

Active low going, analogue DC loop enable

pulse

Active low going, IIR enable pulse

Active low going, Area Define pulse

Reserved for Test Purposes

Table 11 PTDO[2:0] control bits operation

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