ST25R3916 datasheet(111/157 Pages) STMICROELECTRONICS

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DS12484 Rev 4

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ST25R3916/7

Application information

156

4.5.49

Auxiliary modulation setting register

Address: 28h

Type: RW

Table 79. Auxiliary modulation setting register

Bit

Name

Default

Function

Comments

dis_reg_am

0: Regulator AM enabled

1: Regulator AM disabled

Uses am_mod<3:0> to set the modulation

index for regulator based AM modulation.

Logic of this bit is inverted. Set to 0 to enable

regulator AM.

lm_ext_pol

0: Normal polarity

1: Inverse polarity

Normal polarity: LM_EXT pin load modulation

signal is active high.

Inverse polarity: LM_EXT pin load modulation

signal is active low.

5lm_ext

0: External load modulation disabled

1: External load modulation enabled

Enables output of load modulation signal on

LM_EXT pin.

lm_dri

0: Driver load modulation disabled

1: Driver load modulation enabled

Uses Passive target modulation register to set

driver load modulation resistance.

res_am

0: Resistive AM modulation disabled

1: Resistive AM modulation enabled

Uses md_res<6:0> to configure resistive AM

modulated driver resistance.

2RFU

1RFU

0RFU

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