MCRF200 Просмотр технического описания (PDF) - Microchip Technology

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MCRF200

125 kHz microID Passive RFID Device

Microchip Technology 

4.0 CONTACTLESS

PROGRAMMING

The contactless programming of the device is possible

for blank devices (CB12=0) only and is recommended

for only low-volume, manual operation during develop-

ment. In volume production, the MCRF200 is normally

used as a factory programmed device only. The

contactless programming timing sequence consists of:

a) RF power-up signal.

b) Short gap (absence of RF field).

c) Verify signal (continuous RF signal).

d) Programming signal.

e) Device response with programmed data.

The blank device (CB12=0) understands the RF

power-up followed by a gap as a blank checking

command, and outputs 128 bits of FSK data with all ‘1’s

after the short gap. To see this blank data (verify), the

reader/programmer must provide a continuous RF

signal for 128 bit-time. (The blank (unprogrammed)

device has all ‘F’s in its memory array. Therefore, the

blank data should be all ‘1’s in FSK format). Since the

blank device operates at Default mode (MOD128),

there are 128 RF cycles for each bit. Therefore, the

time requirement to complete this verify is 128 bits x

128 RF cycles/bit x 8 use/cycles = 131.1 msec for

125 kHz signal.

As soon as the device completes the verify, it enters the

programming mode. The reader/programmer must

provide RF programming data right after the verify. In

this programming mode, each bit lasts for 128 RF

cycles. Refer to Figure 4-1 for the contactless program-

ming sequence.

Customer must provide the following specific voltage

for the programming:

1. Power-up and verify signal = 13.5V ±1 VPP

2. Programming voltage:

- To program bit to ‘1’: 13.5V ±1 VPP

- To program bit to ‘0’: 30V ±2 VPP

After the programming cycle, the device outputs

programmed data (response). The reader/programmer

can send the programming data repeatedly after the

device response until the programming is successfully

completed. The device locks the CB12 as soon as the

programming mode (out of field) is exited and becomes

a read-only device.

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

outputs its data according to the configuration register.

The PG103001 (Contactless Programmer) is used for

the programming of the device. The voltage level

shown in Figure 4-1 is adjusted by R5 and R7 in the

contactless programmer. Refer to the MicroID™

125 kHz RFID System Design Guide (DS51115) for

more information.

 2003 Microchip Technology Inc.

MCRF200

DS21219H-page 9

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