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參數(shù)資料
| 型號(hào)： | MCP455W |
| 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(xiě)無(wú)源RFID器件 |
| 文件頁(yè)數(shù)： | 10/50頁(yè) |
| 文件大小： | 1172K |
| 代理商： | MCP455W |
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MCRF450/451/452/455
DS40232H-page 10
2003 Microchip Technology Inc.
FIGURE 2-3:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF451
FIGURE 2-4:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF452
FIGURE 2-5:
EXTERNAL CIRCUIT CONFIGURATION FOR MCRF455
Note:
Substrate = V
SS
Internal Resonant Capacitor (Cres_100) = 95 pF
L1:
External Antenna Coil A
L2:
External Antenna Coil B
Ant. A
Ant. B
L1
V
SS
L2
MCRF451
Int. Res. Cap.
L1 > L2
ftuned
1
2
π
LT
(
)
95
12
–
×
10
-----------------------------------------------
=
fdetuned
1
2
π
L
1
(
)
95
12
–
×
10
-----------------------------------------------
=
L
T
= Total antenna inductance between Ant. A and V
SS
= 95 pF
Ant. A
Ant. B
L
V
SS
MCRF452
Internal Resonant Capacitor between Ant. A and V
SS
pads:
C
RES
_2_50 + parasitic capacitor = 30 pF
Note:
Substrate = V
SS
ftuned
1
2
π
L
( )
30
12
–
×
10
-------------------------------------------
=
fdetuned
1
2
π
L
( )
50.6
12
–
×
10
-----------------------------------------------
=
Int. Res. Cap.
= 30 pF
50.6 pF
65.4 pF
Internal Resonant Capacitor (Cres_50) = 50 pF
L1: External Antenna Coil A
L2: External Antenna Coil B
Ant. A
Ant. B
L1
V
SS
L2
MCRF455
ftuned
1
2
π
LT
(
)
50
12
–
×
10
-----------------------------------------------
=
fdetuned
1
2
π
L
1
(
)
50
12
–
×
10
-----------------------------------------------
=
L
T
= Total antenna inductance between Ant. A and V
SS
Note:
Substrate = V
SS
L1 > L2
Int. Res. Cap.
= 50 pF
Note:
See application notes AN710 and AN830 for antenna circuit design of
Figure 2-2 through Figure 2-5.
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