YHY638F
13.56MHz RFID Reader/Writer
User Manual
Version 1.0
Page 4 of 28
Apr 2010
4 Electrical Characteristics
4.1 Operating Condition Range
Relative humidity:up to 90%
Symbol
Parameter
Conditions
Min Typ Max Unit
Tamb Ambient
Temperature
0
25
60
℃
VDD
DC Supply
Voltage
DVSS =
0V
4.5
5
5.5
V
Table 1 - Operating Condition Range
4.2 Current Consumption
Symbol Parameter
Conditions
Min Typ Max Unit
IDVDD
Supply
Current
Reading started
but no cards in
the reader range
90
mA
IDVDD
Reading
started,
1 card in the
reader range
95
mA
Table 2 - Current Consumption
4.3 Operating Distance
Symbol Parameter
Conditions Min
Typ
Max Unit
OD
14443 Type A S50 tag
Operating Distance,
Measured
from the
reader
bottom
0-70
mm
OD
14443 Type B tag
Operating Distance
Measured
from the
reader
bottom
0-45
mm
OD
15693 tag Operating
Distance,
Measured
from the
reader
bottom
0-90
mm
Table 3 - Operating Distance
4.4 COM Interface Characteristics
Symbol Parameter
Conditions Min
Typ
Max
Unit
