MCRF450 Ver la hoja de datos (PDF) - Microchip Technology
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MCRF450 Datasheet PDF : 50 Pages
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MCRF450/451/452/455
FIGURE 6-2:
100%
PULSE WAVEFORM OF GAP AND 1-OF-16 PPM SIGNALS
t1
50%
0%
t2
B
A
(a) Example of Interrogator’s signal received at tag’s antenna coil.
See Table 6-7 for the specifications of t1, t2, and modulation depth (modulation index).
The Modulation Index is defined as:
Modulation Index
=
-A-----–----B---
A+B
×
100
%
B
A
(b) FRR command waveform for Figure 6-3 (A) with near 100% Modulation Index
B
A
(c) FRR command waveform for Figure 6-3 (A) with near 20% Modulation Index
TABLE 6-7: WAVEFORM CHARACTERISTICS OF GAP AND 1-0F-16 PPM SIGNALS
Signal
Symbol
Min
Typ
Max
Unit
Conditions
Gap signal and
t1
145
1-of-16 PPM for
t2
20
Normal mode
MODINDEX_GAP
20
1-of-16 PPM for
t1
8.3
Fast mode
t2
6.0
MODINDEX_GAP
20
175
205
100
150
60
100
10
11.7
7.0
8.0
60
100
µs PWPPM_N
µs Measured at 50%, See Figure 6-2
GAPWIDTH_N
% See Figure 6-2
µs PWPPM_F
µs Measured at 50%, See Figure 6-2
GAPWIDTH_F
% See Figure 6-2
DS40232H-page 24
2003 Microchip Technology Inc.
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