Texas Instruments HFDEMOKITII ユーザーズマニュアル
September 2001
S6350 Reader Reference Guide
10
2.1.4 Required Antenna Parameters
Impedance
50
Ω
±
5
Ω
at 13.56 MHz
Loaded Q
10 < Q < 30
Note:
As no standard antenna is provided by Texas Instruments for the
S6350 reader, the noted required antenna parameters must be
closely followed by the integrator for the reader to operate properly.
S6350 reader, the noted required antenna parameters must be
closely followed by the integrator for the reader to operate properly.
2.1.5 Input / output pins (CN1 pins 3 and 4)
Pins 3 and 4 on CN1 may be configured by software commands to read a logic level input or to
switch an external load to ground (no pull-up is provided).
switch an external load to ground (no pull-up is provided).
Figure 2: Example Circuit Diagram of an IO pin
When used as a switch to ground the following ratings should not be exceeded:
Maximum voltage
20V
Maximum current
50mA
CAUTION:
Exceeding this Voltage and Current limit could cause
permanent damage to the reader.
permanent damage to the reader.
Note:
That if an output has been set by a software command the state will
always read back as a logic 0.
always read back as a logic 0.