FX623 datasheet(3/6 Pages) ETC

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Application Information

C 1

R 1

C 4

X 1

R 2

C 3

C 2

FX623P

XTAL/CLOCK

P URS

DATA CHANGE

SIGNAL IN

COMPOSITE SIGNAL IN

A HEX Code

Output representing

the decoded tone

frequency

See Table 1

DATA OUTPUTS

C 5

XTAL

HOLD

IRQ

Fig.2 Recommended External Components

Band Edges (Hz)

Nominal

Hex

Output Code

Lower

Upper

Centre

Character Q3 Q2 Q1 Q0

Edge

Freq.

0000

364

386

375

0001

488

520

500

0010

520

580

550

0011

580

618

600

0100

386

412

400

0101

412

436

425

0110

436

463

450

0111

463

487

475

1000

900

1008

950

1001

1273

1325

1300

1010

1350

1455

1400

1011

1750

1855

1800

1100

2062

2140

2100

1101

frequency not guaranteed

1110

frequency not guaranteed

1111

NOTONE

Table 1 Tone Decode Frequencies

Timing Information

With CS Low - Figure 3.

After initial power-up and the Hold input inactive

(High), as frequencies are input, with the Data Change

output as an active (High) indicator, the data is

presented at the Data Outputs.

If/when the Hold input is placed active (Low), the

data at the Data Outputs is frozen and the Data

Change output held High at its next active excursion -

until the Hold input is returned High.

With the Hold input held High - Figure 4.

As frequencies are input a correct decode will

produce an active (Low) interrupt level.

This interrupt (IRQ) is serviced and reset by an

active (Low) CS input.

Note the ‘valid data’ period at the Data Outputs.

Component

Value

1.0M

Ω

1.0M

Ω

47.0nF

4.7nF

33.0pF

1.0µF

3.579545MHz

Tolerances R = ±10%

C = ±20%

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