ST25R3911B datasheet(47/116 Pages) STMICROELECTRONICS

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Example

In case of the modulation index 10% the ratio between the non

‑modulated level (a) and the modulated level (b) is

1.2222, which, converted to binary and truncated to six decimals is 1.001110. So, in order to define the

modulation index 10% the bits mod5 to mod0 have to be set to 001110.

Table 17 shows the setting of the mod bits and the associated modulation indexes.

Table 17. Setting mod bits

Modulation Index (%)

mod5 … mod0

Modulation Index (%)

mod5 … mod0

0.0

000000

20.0

100000

0.8

000001

20.5

100001

1.5

000010

21.0

100010

2.3

000011

21.5

100011

3.0

000100

22.0

100100

3.8

000101

22.4

100101

4.5

000110

22.9

100110

5.2

000111

23.4

100111

5.9

001000

23.8

101000

6.6

001001

24.3

101001

7.2

001010

24.7

101010

7.9

001011

25.1

101011

8.6

001100

25.6

101100

9.2

001101

26.0

101101

9.9

001110

26.4

101110

10.5

001111

26.9

101111

11.1

010000

27.3

110000

11.7

010001

27.7

110001

12.3

010010

28.1

110010

12.9

010011

28.5

110011

13.5

010100

28.9

110100

14.1

010101

29.3

110101

14.7

010110

29.7

110110

15.2

010111

30.1

110111

15.8

011000

30.4

111000

16.3

011001

30.8

111001

16.9

011010

31.2

111010

17.4

011011

31.6

111011

17.9

011100

31.9

111100

18.5

011101

32.3

111101

19.0

011110

32.6

111110

19.5

011111

33.0

111111

ST25R3911B

Application information

DS11793 - Rev 6

page 47/116

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