MCRF200 Microchip Technology Inc., MCRF200 Datasheet - Page 6

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

MCRF200
FIGURE 2-3:
2.2.4
The CB12 must be ‘0’ for contactless programming
(Blank). The bit (CB12) is automatically set to ‘1’ as
soon as the device is programmed contactlessly.
2.3
The device has 128 bits of one-time programmable
(OTP) memory. The user can choose 96 or 128 bits by
selecting the CB1 bit in the configuration register. See
Table 2-4 for more details.
2.3.1
The column and row decoders address the EEPROM
array at the clock rate and generate a serial data
stream for modulation. This data stream can be up to
128 bits in length. The size of the data stream is user
programmable with CB1 and can be set to 96 or 128
bits. Data lengths of 48 and 64 bits are available by
programming the data twice in the array, end-to-end.
The column and row decoders route the proper voltage
to the array for programming and reading. In the
programming modes, each individual bit is addressed
serially from bit 1 to bit 128.
2.4
EXAMPLE 2-1:
DS21219H-page 6
The “08D” (hex) configuration is interpreted as
follows:
Referring to Table 2-4, the “08D” configuration
represents:
‘1’
“08D”
Modulation = PSK_1
PSK rate = rf/2
Data encoding = NRZ_L (direct)
Baud rate = rf/32 = MOD32
Memory size 128 bits
P P
P
Memory Section
Examples of Configuration
Settings
P
MEMORY ARRAY LOCK BIT (CB12)
COLUMN AND ROW DECODER
LOGIC AND BIT COUNTER
0000-1000-1101
CB12
‘0’
PSK DATA MODULATION
“08D” CONFIGURATION
CB1
‘0’
P P
P P
‘1’
EXAMPLE 2-2:
EXAMPLE 2-3:
The “00A” (hex) configuration is interpreted as
follows:
The MSB corresponds to CB12 and the LSB
corresponds to CB1 of the configuration register.
Therefore, we have:
Referring to Table 2-4, the “00A” configuration
represents:
The FDX-B ISO Specification is:
Referring to Table 2-4, the equivalent MCRF200
configuration is: “14D”.
CB12=0
CB8=0
CB4=1
“00A”
Not programmed device (blank), anticollision:
disabled, FSK protocol, NRZ_L (direct) encod-
ing, MOD50 (baud rate = rf/50), 96 bits.
Modulation = ASK
Data encoding = Differential biphase
Baud rate = rf/32 = 4 Kbits/sec for 128 kHz
Memory size = 128 bits
P P
0000-0000-1010
CB11=0
CB12
CB7=0
CB3=0
‘1’
“00A” CONFIGURATION
MCRF200
CONFIGURATION FOR
FDX-B ISO ANIMAL
STANDARD PROTOCOL
(ASP)
¤ 2003 Microchip Technology Inc.
CB10=0
P P
CB6=0
CB2=1
CB1
Encoded Data
(NRZ_L)
PSK_ 1
Change on Data
PSK _2
Change on ‘1’
CB9=0
CB5=0
CB1=0