ST25R3918 datasheet(108/141 Pages) STMICROELECTRONICS

108 / 141 page

Application information

ST25R3918

108/141

DS13490 Rev 2

4.5.54

External field detector deactivation threshold register

Address: 2Bh

Type: RW

1.42

114

4.92

1.45

115

5.33

1.49

116

5.82

1.52

117

6.40

1.56

118

7.11

1.60

119

8.00

1.64

120

9.14

1.68

121

10.67

1.73

122

12.80

1.78

123

16.00

1.83

124

21.33

1.88

125

32.00

1.94

126

64.00

2.00

127

HighZ

1. The value has to be multiplied by the RFO resistance from Section 5.4: Electrical characteristics to obtain the driver output

resistance for the corresponding md_res setting.

Table 81. Resistive AM modulated state driver output resistance (continued)

md_res<6:0>

Driver output resistance RRFO

(normalized)(1)

md_res<6:0>

Driver output resistance RRFO

(normalized)(1)

Table 82. External field detector deactivation threshold register

Bit

Name

Default

Function

Comments

RFU

Not used

trg_ld2

Deactivation peer detection

threshold (see Table 83).

trg_ld1

trg_ld0

rfe_td3

Deactivation collision avoidance

threshold (see Table 84).

rfe_td2

rfe_td1

rfe_td0

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