MCP450P Microchip Technology, MCP450P Datasheet - Page 28

• Manufacturer Part Number: MCP450P
• Description: 13.56 MHz Read/Write Passive RFID Device
• Manufacturer: Microchip Technology

MCRF450/451/452/455
6.2.3.3
The
determined by an expected number of tags in the
Detection Loop. The following table shows the
EQUATION 6-1:
TABLE 6-8:
6.2.3.4
The
End Process (EP) and also commands in Table 6-2.
1-of-16 PPM uses only one gap pulse in one of
symbols
data packet) represents 4 bits of binary data. One
symbol lasts for 2.8 ms and 160 s for Normal Speed
and Fast Speed mode, respectively. All communica-
tions begin with time calibration pulses (TCP)
fourteen of a 1-of-16 PPM symbol, as shown in
Figure 6-10.
TABLE 6-9:
DS40232H-page 28
Modulation (PPM) for MC1 and MC2 matching codes,
sixteen possible pulse positions for sending 4-bit
composed of three pulses in positions, zero, six and
Modulation depth (MOD
Pulse width
Gap width
Pulse positions per symbol
Symbol width
Calibration sequence
Command Repeat Time
Where:
Command Repeat Time
1.17 is related to the tolerance of the baud rate.
(TSMAX, TCMAX)
parameters
Interrogator
(2
Usage Of TSMAX And TCMAX
1-of-16 PPM
4
= 16). This means one symbol (one
FRR COMMAND REPEAT TIME VS. (TSMAX, TCMAX)
1-OF-16 PPM PULSE SPECIFICATIONS
of
uses
COMMAND REPEAT TIME
=
TSMAX
INDEX
TSMAX
1-of-16
_
2.925 ms
GAP
(1,1)
and
)
TCMAX
Pulse
TCMAX
Pulses in positions 0, 6, 14
5.85 ms
(1,2)
Position
2.5ms 1.17
175 s (typical)
100 s (typical)
2.8 ms (typical)
Normal Mode
100% (max)
are
16
11.7 ms
(1,4)
recommended FRR command repeat times for each of
the 7 possible combinations of TSMAX and TCMAX.
The command repeat time in Table 6-8 is calculated by:
46.8 ms
(16,1)
93.6 ms
(16,2)
Pulses in positions 0, 6, 14
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160 s (typical)
10 s (typical)
7 s (typical)
100% (max)
Fast Mode
187.2 ms
(16,4)
16
187.2 ms
(64,1)