MCRF250
Contactless Programmable Passive RFID Device With Anti-Collision
FEATURES
• Anti-collision feature to resolve multiple tags in
the same RF field
APPLICATION
• Read-only data transmission
RF
Signal
• 96 or 128 bits of One-Time Programmable (OTP)
user memory (also supports 48 and 64-bit
protocols)
Transmitter/
Receiver
MCRF250
• Operates up to 150 kHz
Data
• On-chip rectifier and voltage regulator
• Low power operation
• Factory programming and device serialization
available
The MCRF250 is equipped with an anti-collision
feature that allows multiple tags in the same field to
be read simultaneously. This revolutionary feature
eliminates the issue of data corruption due to
simultaneous transmissions from multiple tags.
• Encoding options:
- NRZ Direct, Differential Biphase, Manchester
Biphase, Biphase IDI
• Modulation options:
- FSK, Direct, PSK (change on data change),
PSK (change at the beginning of a one)
The user memory array of this device can be
programmed contactlessly after encapsulation. This
allows the user to keep encapsulated blank tags in
stock for on-demand personalization. The tags can
then be programmed with data as they are needed.
• Contactless programmable after encapsulation
DESCRIPTION
This device is a Radio Frequency Identification (RFID)
tag that provides a variety of operating modes. The
device is powered by an external RF transmitter
(reader) through inductive coupling. When in the reader
field, the device will transmit the contents of its memory
array by damping (modulating) the incoming RF signal.
A reader is able to detect the damping and decodes the
data being transmitted. Code length, modulation
option, encoding option and bit rate are set at the
factory to fit the needs of particular applications.
These devices are available in die form or packaged in
SOIC, PDIP or COB modules. The encoding,
modulation, frequency, and bit rate options are
specified by the customer and programmed by
Microchip Technology Inc. prior to shipment. Array pro-
gramming and serialization (SQTP) can also be
arranged upon request. See TB023 (page 23) for more
information.
BLOCK DIAGRAM
Data
Modulation
Control
Clock
Anti-collision
Circuitry
Generator
Memory
Array
Row
Decode
Coil
Connections
VCC
VSS
Rectifier
Column
Decode
Counter
2001 Microchip Technology Inc.
DS21267D-page 1