ST25R3918 datasheet(105/142 Pages) STMICROELECTRONICS

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DS13490 Rev 1

105/142

ST25R3918

Application information

141

4.5.50

Passive target modulation register

Address: 29h

Type: RW

Table 76. Passive target modulation register

Bit

Name

Default

Function

Comments

ptm_res3

Refer to Table 77

RFO resistance during passive load modulation,

modulated state.

ptm_res<3:0> must be set before the Mode

definition register is set to passive target mode.

ptm_res2

ptm_res1

ptm_res0

pt_res3

RFO resistance during passive load modulation,

unmodulated state.

pt_res<3:0> must be set before the Mode

definition register is set to passive target mode.

pt_res2

pt_res1

pt_res0

Table 77. Passive target modulated and unmodulated state driver output resistance

ptm_res<3:0>

pt_res<3:0>

Driver output resistance RRFO (normalized)

00.25

10.50

21.00

32.00

43.05

54.00

66.40

78.00

89.15

10.68

12.80

16.00

21.33

32.00

64.00

High Z

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