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| 型號(hào)： | MCP452S |
| 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(wú)源RFID器件 |
| 文件頁(yè)數(shù)： | 31/50頁(yè) |
| 文件大小： | 1172K |
| 代理商： | MCP452S |
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2003 Microchip Technology Inc.
DS40232H-page 31
MCRF450/451/452/455
32-bit Tag ID and TC are included in the FR response.
An example for the calculation of the matching code is
given in Example 9-2.
EQUATION 6-2:
BIT-WISE EQUATION FOR
“MATCH”
6.3
Time Slot Generator
This block generates time slots for the device. The time
slot represents the time delay between the end of the
FRR command and the beginning of the FR response.
The available time slots are 1, 16 or 64. One time slot
represents 2.5 ms. The device calculates the actual
time slot based on the TSMAX, TC and Tag ID. The
maximum time slot (TSMAX) is assigned to the device
by the FRR command (see Figures 6-3 to 6-7), or set
to 16, if the TF bit is set.
Four or six bits out of the 32-bit Tag ID are used to
calculate the time slot, with TC being the shift
parameter to choose which portion of the 32-bit Tag ID
is used, as shown in Equation 6-3.
EQUATION 6-3:
TIME SLOT CALCULATION
TABLE 6-10:
EXAMPLE: TAG ID = h′825FE1A0
Table 6-10 shows the calculated time slot (TS): 5 for
TC = 1 and TSMAX = 16 with Tag ID = h
′
825FE1A0
′
.
This means the device waits for 12.5 ms (5 x 2.5 ms =
12.5 ms) in a nonmodulating condition between the
end of FRR and the start of the FR response.
Also, the TS is 37 for TC = 1 and TSMAX = 64. This
means the device waits for 92.5 ms (37 x 2.5 ms =
92.5 ms) between the end of FRR and the start of the
FR response in a nonmodulating condition.
6.4
TIME SLOT COUNTER
This section generates the Sleep time (2.5 ms x TS) of
the device. During the Sleep time, the device remains
in a nonmodulating condition.
“Match” = Tag ID bit range a: b
{4*TC} modulo 32: {4 (TC +1) + 3} modulo 32
where {} modulo 32 means the remainder of {}
divided by 32. For example, {28} modulo 32 and {35}
modulo 32 are 28 and 3, respectively.
TSMAX
Time Slot = Tag ID bit range a:b
64
{[4(TC+1)+1] modulo 32: [4 TC] modulo 32} XOR TC LSB
16
{[4(TC+1)-1] modulo 32: [4 TC] modulo 32} XOR TC LSB
1
0
Note:
The exclusive-or (XOR) operation in Equation 6-3 is called “semi-inverting” in that it randomizes worst case
tag IDs; for example: a Tag ID of ‘
77777777
’ or ‘
00000000
’. Table 6-10 shows examples of the
calculation.
TC
Relevant Tag ID
Selected Tag ID before
XOR with LSB of TC
Calculated Time Slot (TS)
(after XOR with LSB of TC)
Hexadecimal
Binary
TSMAX = 16
TSMAX = 64
TSMAX = 16
TSMAX = 64
0
h′825FE1(A0)′
b’1010 0000’
h′0′
h′20′
h′0′
d′0′
h′20′
d′32′
1
h′825FE(1A)0′
b’0001 1010’
h′A′
h′1A′
h′5′
d′5′
h′25′
d′37′
2
h′825F(E1)A0′
b’1110 0001’
h′1′
h′21′
h′1′
d′1′
h′21′
d′33′
3
h′825(FE)1A0′
b’1111 1110’
h′E′
h′3E′
h′1′
d′1′
h′01′
d′1′
4
h′82(5F)E1A0′
b’0101 1111’
h′F′
h′1F′
h′F′
d′15′
h′1F′
d′31′
5
h′8(25)FE1A0′
b’0010 0101’
h′5′
h′25′
h′A′
d′10′
h′1A′
d′26′
6
h′(82)5FE1A0′
b’1000 0010’
h′2′
h′02′
h′2′
d′2′
h′02′
d′2′
7
h′(08)25FE1A′
b’0000 1000’
h′8′
h′08′
h′7′
d′7′
h′37′
d′55′
Legend:
h
′
x..x
′
represents hexadecimal number
d
′
x..x
′
represents decimal number
b
′
x..x
′
represents binary number
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| MCP452SB | 13.56 MHz Read/Write Passive RFID Device |
| MCP452SN | 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| MCP452W | 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
| MCP452WB | 13.56 MHz Read/Write Passive RFID Device |
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