28140 Parallax Inc, 28140 Datasheet - Page 2

• Manufacturer Part Number: 28140
• Description: READER MODULE RFID
• Manufacturer: Parallax Inc

Specifications of 28140

• Rf Type: Read Only
• Frequency: 125kHz
• Features: Single 5V Power Supply
• Package / Case: Module
• Product: Microcontroller Accessories
• Data Bus Width: 8 bit
• Clock Speed: 125 KHz
• Interface Type: USB
• Operating Supply Voltage: 5.5 V
• Board Size: 46.99 mm x 69.22 mm x 21.84 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

The Parallax RFID Reader Module works exclusively with the EM Microelectronics-Marin SA EM4100-family
of passive read-only transponder tags. A variety of different tag types and styles exist with the most
popular made available from Parallax. Each transponder tag contains a unique identifier (one of 2
1,099,511,627,776, possible combinations) that is read by the RFID Reader Module and transmitted to
the host via a simple serial interface.
Electronic Connections
The Parallax RFID Reader Module can be integrated into any design using only four connections (VCC,
/ENABLE, SOUT, GND). Use the following circuit for connecting the Parallax RFID Reader Module to the
BASIC Stamp microcontroller:
Parallax, Inc. • RFID Reader Module (#28140) •Updated 02/2006 v1.1
Pin
1
2
3
4
Note: Type: I = Input, O = Output, P = Power, G = Ground
Pin Name
VCC
/ENABLE
SOUT
GND
Type
P
I
O
G
Function
System power, +5V DC input.
Module enable pin. Active LOW digital input. Bring this pin LOW to
enable the RFID reader and activate the antenna.
Serial Out. TTL-level interface, 2400bps, 8 data bits, no parity, 1 stop bit.
System ground. Connect to power supply’s ground (GND) terminal.
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