SLRC400 Datasheet, PDF (87/130 Pages) NXP Semiconductors – I·CODE Reader IC

Philips Semiconductors
I•CODE Reader IC
Product Specification Rev. 2.0 November 2001
SL RC400
13.3 Changing the Modulation Index
The following table shows the modulation index, if a 50 ohm antenna is used and GsCfgCW is set to 0x3F.
To change the modulation index the GsCfgMod register has to be changed similar as the GsCfgCW register.
GsCfgMod
rel. resistance
Mod. index
Rrel(during modulation) Rant=50Ω
0x00
Infite
0x10
Infite
0x20
Infite
0x30
Infite
0x01
1,000
43,45%
0x11
0,522
28,44%
0x02
0,500
27,57%
0x03
0,333
20,08%
0x21
0,270
16,83%
0x12
0,261
16,33%
0x04
0,250
15,73%
0x05
0,200
12,88%
0x13
0,174
11,32%
0x06
0,167
10,88%
0x07
0,143
9,38%
0x31
0,140
9,21%
0x22
0,135
8,89%
0x14
0,130
8,59%
0x08
0,125
8,23%
0x09
0,111
7,32%
0x15
0,104
6,86%
0x0A
0,100
6,57%
0x0B
0,091
5,95%
0x23
0,090
5,89%
0x16
0,087
5,68%
0x0C
0,083
5,43%
0x0D
0,077
4,98%
0x17
0,075
4,81%
0x0E
0,071
4,59%
0x32
0,070
4,50%
0x24
0,068
4,32%
0x0F
0,067
4,26%
GsCfgMod
rel. resistance
Mod. index
Rrel(during modulation) Rant=50Ω
0x18
0,065
4,15%
0x19
0,058
3,63%
0x25
0,054
3,35%
0x1A
0,052
3,22%
0x1B
0,047
2,87%
0x33
0,047
2,82%
0x26
0,045
2,69%
0x1C
0,043
2,58%
0x1D
0,040
2,33%
0x27
0,039
2,22%
0x1E
0,037
2,12%
0x34
0,035
1,95%
0x1F
0,035
1,93%
0x28
0,034
1,86%
0x29
0,030
1,58%
0x35
0,028
1,43%
0x2A
0,027
1,35%
0x2B
0,025
1,17%
0x36
0,023
1,08%
0x2C
0,023
1,01%
0x2D
0,021
0,88%
0x37
0,020
0,82%
0x2E
0,019
0,77%
0x2F
0,018
0,67%
0x38
0,018
0,63%
0x39
0,016
0,48%
0x3A
0,014
0,36%
0x3B
0,013
0,26%
0x3C
0,012
0,18%
0x3D
0,011
0,11%
0x3E
0,010
0,05%
0x3F
0,009
0,00%
Note: If the output source conductance (GsCfgCW) has been changed GsCfgMod must also be changed to
get the same modulation index.
87
Preliminary