Atmel ATA5283 Manual do Utilizador descarregar pdf (Página 11)

4598H–AUTO–03/07

ATA5283

3 Automatic Gain Control

3.1 Preamble detection time

≥ 3mV

rms

125 kHz

DAGC

192 Periods B

3.2 AGC adjustment time

f = 125 kHz

= 1 mV

rms

= 3 mV

rms

= 30 mV

rms

= 100 mV

rms

= 1V

rms

AGC

220

292

450 512

Periods C

3.3

Signal change rate

(gap detection)

Coil input signal 100%

to 37% (τ)

EOS

20 Periods C

3.4

AGC correction time

(no gap detection)

Coil input signal:

50 to 100% changing

CORR

52 Periods C

Coil input signal:

100 to 50% changing

CORR

208 Periods C

3.5 Data rate (Q < 20) 125 kHz ASK DR 4 Kb/s A

3.6 Delay time RF signal to data 125 kHz ASK t

40 µs A

3.7 Delay time RF signal to data 125 kHz ASK t

OFF

40 µs A

4 Interface

4.1 Reset input level high 5 V

HRESET

0.8 ×

4.1.1 Reset pulse width V

RESET

= V

RESET

20 µs A

4.2 Reset input level low 5 V

LRESET

0.2 ×

4.3

Reset input leakage current

low

RESET

= V

-0.2 0 µA A

4.4

Reset input leakage current

high

RESET

= V

00.2µAA

4.5 N_WAKEUP output level high I

NWAKEUP

= –100 µA 7 V

HNWAKE

0.8 ×

4.6 N_WAKEUP output level low I

NWAKEUP

= 100 µA 7 V

LNWAKE

00.2 × V

4.7 N_DATA output level high I

N_DATA

= –100 µA 6 V

HNDATA

0.8 ×

4.8 N_DATA output level low I

N_DATA

= 100 µA 6 V

LNDATA

00.2 × V

5 Power Supply and Reset

5.1 V

power on reset threshold V

POR

11.51.9 V A

5.2 Power-up time

Switch on V

to circuit

active

PON

100 ms C

5.2.1

Standby reactivation delay

after pulse reset

f = 125 kHz T

Sbydel

800 µs C

5.3

RESET reactivation caused by

negative spikes on V

BDN

= 500 ns 7 t

RST

10 200 µs C

7. Electrical Characteristics (Continued)

= 0V, V

= 2V to 3.8V, T

amb

= –40°C to +105°C, characterized up to 125°C, unless other specified

No. Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Type*

*) Type means: A = 100% tested, B = 100% correlation tested, C = Characterized on samples, D = Design parameter

1 2 ... 6 7 8 9 10 11 12 13 14

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