32395 Parallax Inc, 32395 Datasheet - Page 5

• Manufacturer Part Number: 32395
• Description: RFID READER USB/TAG SAMPLER
• Manufacturer: Parallax Inc
• Series: -r

Specifications of 32395

• Rf Type: Read Only
• Frequency: 125kHz
• Features: -
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 32395PAR

DC Characteristics
At V
Absolute Maximum Ratings
NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage
to the device. This is a stress rating only and functional operation of the device at those or any other
conditions above those indicated in the operation listings of this specification is not implied. Exposure to
maximum rating conditions for extended periods may affect device reliability.
RFID Technology Overview
Material in this section is based on information provided by the RFID Journal (www.rfidjournal.com).
Radio Frequency Identification (RFID) is a generic term for non-contacting technologies that use radio
waves to automatically identify people or objects. There are several methods of identification, but the
most common is to store a unique serial number that identifies a person or object on a microchip that is
attached to an antenna. The combined antenna and microchip are called an "RFID transponder" or "RFID
tag" and work in combination with an "RFID reader" (sometimes called an "RFID interrogator").
An RFID system consists of a reader and one or more tags. The reader's antenna is used to transmit
radio frequency (RF) energy. Depending on the tag type, the energy is "harvested" by the tag's antenna
and used to power up the internal circuitry of the tag. The tag will then modulate the electromagnetic
waves generated by the reader in order to transmit its data back to the reader. The reader receives the
modulated waves and converts them into digital data.
There are two major types of tag technologies. "Passive tags" are tags that do not contain their own
power source or transmitter. When radio waves from the reader reach the chip’s antenna, the energy is
converted by the antenna into electricity that can power up the microchip in the tag (typically via
inductive coupling). The tag is then able to send back any information stored on the tag by modulating
the reader’s electromagnetic waves. "Active tags" have their own power source and transmitter. The
power source, usually a battery, is used to run the microchip's circuitry and to broadcast a signal to a
reader. Due to the fact that passive tags do not have their own transmitter and must reflect their signal
Copyright © Parallax Inc.
CC
Supply Voltage
Supply Current, Idle
Supply Current, Active
Input LOW voltage
Input HIGH voltage
Output LOW voltage
Output HIGH voltage
= +5.0V and T
Parameter
Condition
Operating Temperature
Storage Temperature
Supply Voltage (V
Ground Voltage (V
Voltage on any pin with respect to V
A
= 25ºC unless otherwise noted
RFID Card Reader Serial & USB (#28140 / 28340)
V
I
I
V
V
V
V
IDLE
CC
cc
Symbol
CC
IL
IH
OL
OH
ss
)
)
---
---
---
+4.5V <= V
+4.5V <= V
V
V
CC
CC
= +4.5V
= +4.5V
ss
Conditions
Test
CC
CC
<= +5.5V
<= +5.5V
4.5
---
---
---
2.0
---
V
CC
Min.
- 0.7
Value
-40ºC to +85ºC
-55ºC to +125ºC
+4.5V to +5.5V
0V
-0.3V to +7.0V
Specification
5.0
10
100
---
v2.2 3/22/2010 Page 5 of 11
---
---
---
Typ.
5.5
---
200
0.8
---
0.6
---
Max.
V
mA
mA
V
V
V
V
Unit