MCRF200 데이터 시트보기 (PDF) - Microchip Technology

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MCRF200

125 kHz microID Passive RFID Device

Microchip Technology 

MCRF200

3.0 MODES OF OPERATION

The device has two basic modes of operation: Native

mode and Read mode.

3.1 Native Mode

Every unprogrammed blank device (CB12=0) operates

in Native mode, regardless of configuration register

settings:

FCLK/128, FSK, NRZ_L (direct)

Once the user memory is programmed, the lock bit is

set (CB12=1) which causes the MCRF200 to switch

from Native mode to the Communication mode defined

by the configuration register.

Refer to Figure 4-1 for contactless programming

sequence. Also see the microID™ 125 kHz RFID

System Design Guide (DS51115) for more information.

3.2 Read Mode

After the device is programmed (CB12=1), the device

is operated in the Read-only mode. The device

transmits its data according to the protocol in the

configuration register.

FIGURE 3-1:

From

Reader

To Reader

amplifier/filter

TYPICAL APPLICATION CIRCUIT

IAC

125 kHz

RF Signal

L

2.5 mH 648 pF

L

C

Input capacitance: 2 pF

Pad VA

Pad VB

Data

C

MCRF200

fres =

---------1----------

2π LC

=

125 kHz

DS21219H-page 8

 2003 Microchip Technology Inc.

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