MCRF200 Microchip Technology Inc., MCRF200 Datasheet - Page 9

• Manufacturer Part Number: MCRF200
• Description: 125 Khz Microid? Passive Rfid Device
• Manufacturer: Microchip Technology Inc.

4.0
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)
b)
c)
d)
e)
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.
2.
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.
- To program bit to ‘1’: 13.5V ±1 V
- To program bit to ‘0’: 30V ±2 V
RF power-up signal.
Short gap (absence of RF field).
Verify signal (continuous RF signal).
Programming signal.
Device response with programmed data.
Power-up and verify signal = 13.5V ±1 V
Programming voltage:
CONTACTLESS
PROGRAMMING
PP
PP
PP
™
MCRF200
DS21219H-page 9