AS2533F datasheet(18/26 Pages) AMSCO

18 / 26 page

Data She et AS25 33-36

austriamicrosystems

Revision 8.10

Page 17 of 25

Symbol

Parameter

Conditions

Min

Typ

Max

Units

tFD

Flash Duration 1

R1 key

100

102

Flash Duration 2

R2 key

270

300

Flash Duration 3

R3 key (AS2533/34/35/36)

600

650

tPFP

Post Flash Pause

274

tAP

Access Pause

Note 8

2.0

2.05

2.12

sec

tRP

Repeat Break Time

1.6

sec

Tone Ringer

VMO

Melody Output

PDM

tMD

Melody Delay

Frequency 1

800

Frequency 2

1067

Frequency 3

1333

tDT

Detection Time

Initial

1/f + 73ms

tTO

Detection Time-out

note 4

fMIN

Min. Detection Frequency

fMAX

Max. Detection Frequency

Pacifier Tone

Program Mode Only

fPT

Frequency

P/M mode, key entry

1477

VRT

Level (RO)

Key entry

tRTD-E

Duration, Key Entry

Valid key entry, prog.

tRTD-A

Duration, Acknowledge

Terminate with P/M key

140

tRTD-R

Duration, Reject

Invalid key entry, note 7

4x40

LED Output

tLED-ON

"on-time"

P/M state

tLED-OFF

Interval

P/M state

sec

Comfort Tone (DTMF)

VCT

Level (RO)

Relative to LS

-30

dBr

Note 1: The values are valid during automatic dialing and

are minimum values during manual dialing, i.e. the

tones will continue as long as the key is depressed.

Note 2: The rise time is the time from 10% of final value till

the tone amplitude has reached 90 % of its final

value.

Note 3: Relative to high group.

Note 4: The FCI circuit is reset by POR and HS/DPN pulled

high (off-hook). After a reset the FCI circuit is in a

standby state. A positive edge on FCI will start a 73

ms timer and the frequency discrimination is

initiated. Whenever a period of the ring signal is

missing, the timer is reset. When a valid ring signal

is present for 73 ms, the melody generator is

started and is directly controlled by the ring signal.

This condition will remain until a new reset.

Note 5: This does not include the frequency deviation of the

ceramic resonator.

Note 6: During temporary MF mode.

Note 7: An invalid key entry in program mode will invoke a

tone sequence with 4 tone bursts of 40 ms and

pauses between bursts of 28 ms and abort the

program mode.

Note 8: Pauses inserted within the first 5 entries of a digit

string will be automatically terminated after 2

seconds. Pauses inserted after location 5 can only

be terminated manually by pressing the PS or LNR

key.

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