at88rf1354 ATMEL Corporation, at88rf1354 Datasheet - Page 10

• Manufacturer Part Number: at88rf1354
• Description: 13.56 Mhz Type B Rf Reader Specification
• Manufacturer: ATMEL Corporation

6.1.
10
13.56 MHz Type B RF Reader
Power and Ground Pin Descriptions
6.1.1.
Supply Voltage for I/O buffers, digital, and analog circuits. V
since all digital I/O levels are referenced to V
Two V
must be placed within 3 mm of the package. A 2.2 uF capacitor should also be placed within 3 cm of the package.
Ceramic capacitors with X5R or X7R dielectric and a working voltage of 10 volts minimum should be used.
6.1.2.
Digital ground. Ground for I/O buffers and digital circuits. For maximum performance the digital ground plane must be
separated from the analog ground plane (V
6.1.3.
Analog ground. Ground for analog circuits. For maximum performance the V
V
V
6.1.4.
Antenna supply voltage. Powers the transmitter and antenna drive circuits.
Two V
SRF of 32 MHz must be placed within 3 mm of
of the package. Ceramic capacitors with X5R or X7R dielectric and a working voltage of 10 volts minimum should be
used.
6.1.5.
Antenna ground. High current return path for transmitter and antenna drive circuit current. For maximum performance
the V
circuit block.
6.1.6.
Ground for the die substrate. Must be connected directly to the V
package thermal pad must be soldered to a thermal pad on the board as described in Appendix D to dissipate heat
generated in the die.
Warning: If V
SS
SS
_ANT.
ground plane at only a single point within 1 cm of pins 22 and 23. V
SS
CC
CC
_ANT ground plane should connect to V
_ANT bypass capacitors must be connected between the V
bypass capacitors must be connected between the V
injected into the receiver circuit. Likewise, if V
then transmitter noise will be injected into the receiver circuit. These PCB configurations will significantly
reduce the communication performance of the reader (reducing the communication distance).
V
V
V
V
V
QFN Package Thermal Pad [ePad]
SS
CC
SS
SS
CC
SS
, V
A [23]
_ANT [2]
_ANT [1]
[22]
[24]
SS
A, V
SS
_ANT, and ePad are tied to a single monolithic ground plane, then transmitter noise will be
SS
A) and the antenna ground plane (V
CC
SS
at only a single point near the power filters at the edge of the reader
the package and a 2.2 uF capacitor must be placed within 5 mm
CC
and V
CC
CC
pin and V
voltage must match the microcontroller I/O voltage
CC
CC
_ANT pin and V
SS
_ANT are tied to one monolithic power plane,
digital ground plane with multiple vias. The
SS
. A 15 nF capacitor with SRF of 32 MHz
SS
SS
A should not be connected directly to
A ground plane should connect to the
SS
_ANT) by a minimum of 20 mils.
SS
_ANT. A 15 nF capacitor with
8547A−RFID−10/08