PCIF0 datasheet(196/294 Pages) ATMEL

Nome de Peças	PCIF0

Descrição Electrónicos	High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture

PDF	294 Pages

Scroll/Zoom	100%

Fabricante Electrônico	ATMEL [ATMEL Corporation]

Página de início	http://www.atmel.com

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196 / 294 page

196

9219A–RFID–01/11

Atmel ATA5505 [Preliminary]

Application hint:

The value of the coupling capacity CIN is oriented on data rate to be transmit as well on the

recovery time needed after write command or power on. In automotive immobilizer applica-

tions it is needed for crypto processing to switch over from write to read mode with short

recovery time. Therefore, appropriate values are given by Table 16-2. In case of access con-

trol applications, whereas the recovery time has not so high, a bigger C

IN valu e is

recommended to get an increased read performance.

16.7

Schmitt Trigger

The signal is processed by a Schmitt trigger to suppress possible noise and to make the signal

microcontroller-compatible. The hysteresis level is 100mV applied symmetrically to the DC

operation point. The open-collector output is enabled by a low level at OE (pin 10).

Figure 16-9. Equivalent Circuit of Pin OE

Table 16-2.

Recommended Capacitor Values

Data Rate f = 125 kHz

Input Capacitor 8C

IN)

Decoupling Capacitor (C

HP)

f / 32 = 3.9Kbits/s

680pF

100nF

f / 64 = 1.95Kbits/s

1.2nF

220nF

7µA

PCIF0 Folha de dados(PDF) 196 Page - ATMEL Corporation