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| 型號： | MCP452SB |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 13.56 MHz Read/Write Passive RFID Device |
| 中文描述： | 13.56 MHz讀/寫無源RFID器件 |
| 文件頁數(shù)： | 9/50頁 |
| 文件大?。?/td> | 1172K |
| 代理商： | MCP452SB |
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2003 Microchip Technology Inc.
DS40232H-page 9
MCRF450/451/452/455
TABLE 2-7:
PAD FUNCTION TABLE
FIGURE 2-2:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF450
Name
Function
Ant. Pad A
Connected to antenna coil L1.
Ant. Pad B
Connected to antenna coils L1 and L2
for MCRF450/451/455, NC for
MCRF452.
V
SS
Connected to antenna coil L2.
Device ground during Test mode.
(V
SS
= substrate)
F
CLK
For device test only. Leave floating or
connect to V
SS
in applications.
CLK
V
DD
For device test only. Leave floating in
applications.
Note:
NC = Not Connected.
Ant. A
Ant. B
L1
V
SS
L2
C
MCRF450
Note:
Substrate = V
SS
L1 > L2
(a) Two inductors and one capacitor
ftuned
1
2
π
LTC
---------------------
=
fdetuned
1
2
π
L
1
C
---------------------
=
LT
L
1
L
2
2
LM
+
+
=
Where: L
M
= mutual inductance of L1 and L2
L
T
= Total antenna inductance between Ant. A and V
SS
LM
K L
1
L
2
=
K = coupling coefficient of two inductors (0
≤
K
≤
1)
Ant. A
Ant. B
L
V
SS
C1
MCRF450
Note:
Substrate = V
SS
C1
≥
C2
(b) One inductor and two capacitors
ftuned
1
2
π
LTCT
-------------------------
=
fdetuned
1
2
π
LC
1
---------------------
=
CT
C
1
C
2
--------------------
C
1
C
2
+
=
C2
Note:
Input parasitic capacitance between Antenna A and V
SS
pads = 3.5 pF.
See application notes, AN710 and AN830 for antenna circuit design.
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