Data Sheet
Copyright © Parallax Inc. RFID Read/Write Module, Serial & USB (#28440 / 28540) v2.0 2/22/2018 Page 8 of 10
ADDR_Serial
is a unique, read-only serial number with one of 2
32
, or 4,294,967,296, possible values. It
cannot be changed by the user.
ADDR_DeviceID
is a read-only value used to identify the specific tag family (for example, EM4150). The
32-bit value contains a family code, version code, reserved/unused bits, and a checksum value. It cannot
be changed by the user.
Further details of the EM4x50 tag can be found at:
www.emmicroelectronic.com/products/rf-identification-security/lf-animal-access-ics/em4450
Electrical Characteristics
At V
CC
= +5.0V and T
A
= 25ºC unless otherwise noted
Parameter Symbol Test Conditions
Specification
Unit
Min.
Typ.
Max.
Supply Voltage
V
CC
---
4.5
5.0
5.5
V
Supply Current, Idle (Serial)
I
IDLE
---
---
9.4
---
mA
Supply Current, Idle (USB)
I
IDLE
---
---
20
---
mA
Supply Current, Active (Serial)
I
CC
---
---
108
200
mA
Supply Current, Active (USB)
I
CC
---
---
91
---
mA
Input LOW voltage
V
IL
+4.5V <= V
CC
+5.5V
---
---
0.8
V
Input HIGH voltage
V
IH
+4.5V <= V
CC
+5.5V
2.0
---
---
V
Output LOW voltage
V
OL
V
CC
= +4.5V
---
---
0.6
V
Output HIGH voltage
V
OH
V
CC
= +4.5V
V
cc
- 0.7
---
---
V
Absolute Maximum Ratings
Condition Value
Operating Temperature
-40ºC to +85ºC
Storage Temperature
-55ºC to +125ºC
Supply Voltage (V
CC
)
+4.5V to +5.5V
Ground Voltage (V
SS
)
0V
Voltage on any pin with respect to V
SS
-0.3V to +7.0V
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.