28140 Parallax Inc, 28140 Datasheet - Page 3

• 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

Connecting and Testing (Serial Version)
The Parallax RFID Card Reader serial version can be integrated into any microcontroller design using only
four connections (VCC, /ENABLE, SOUT, GND). Use the following circuit for connecting the Parallax RFID
Card Reader to the BASIC Stamp microcontroller.
Copyright © Parallax Inc.
Note: Type: I = Input, O = Output, P = Power, G = Ground
Pin
1
2
3
4
Pin Name
VCC
/ENABLE
SOUT
GND
Type
P
I
O
G
RFID Card Reader Serial & USB (#28140 / 28340)
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 Output TTL-level interface, 2400bps, 8 data bits, no parity, 1 stop
bit.
System ground. Connect to power supply’s ground (GND) terminal.
v2.1 8/28/2008 Page 3 of 11