American Audio UCD-200 - REV 8-10 Specifications download pdf (Page 86)

100

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SLAS495A− JUNE 2006 − REVISED OCTOBER 2007

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Port Scan Operation

The time needed to complete one set of port scan conversions is given by:

coordinate

+ 3

ǊN

AVG

BITS

) 1

8MHz

conv

) n

) 12

) 1ǋ t

OSC

) 31 t

OSC

) n

OSC

where:

= 6 ; if ƒ

conv

= 8 MHz

7 ; if ƒ

conv

≠ 8 MHz

= 0 ; if external reference mode is selected

3 ; if t

REF

= 0 µs or reference is programmed for power up all the time.

1 + t

REF

/125 ns; if t

REF

≠

0 µs and reference needs to power down between conversions.

REF

is the reference power up delay time.

Programmed for

Host Controlled

Mode With Invalid

A/D Function

Selected

Detecting Touch

Sample,Conversion &

Averaging for

BAT1 & BAT2 & AUX input

Reading

BAT1−

Data

Waiting for Host to

Write into REG−00

of PAGE−01

Waiting for Host to Write into REG−00

of PAGE−01

REG−00 of

PAGE−01

is updated

for

PORT SCAN

Mode

Reading

BAT2−

Data

Reading

AUX−Data

(As DATA_AVA

[D15−D14 = 01])

PINTDAV

SS DEACTIVATED

Wait for Reference Power-Up Delay in Case

of Internal Ref Mode if Applicable

ADC CHANNEL DIGITAL FILTER FREQUENCY RESPONSES

Figure 39. Pass-Band Frequency Response of ADC Digital Filter

1 2 ... 81 82 83 84 85 86 87 88 89 90 91 ... 99 100

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American Audio UCD-200 - REV 8-10 Specifications Page 86

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