ST25R3911B datasheet(81/116 Pages) STMICROELECTRONICS

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1.3.39

RFO AM modulated level definition register

Address: 26h

Type: RW

Table 65. RFO AM modulated level definition register

Bit Name Default Function

Comments(1)

dram7 0

2 Ohm

Antenna drivers are composed of eight binary weighted segments. Setting a bit dram to 1

will disable corresponding segment during AM modulated state in case am_s bit is set to 1.

dram6 0

4 Ohm

dram5 0

8 Ohm

dram4 0

16 Ohm

dram3 0

32 Ohm

dram2 0

64 Ohm

dram1 0

128 Ohm

dram0 0

256 Ohm

1. Default setting takes place at power-up and after Set Default command.

1.3.40

RFO normal level definition register

Address: 27h

Type: RW

Table 66. RFO normal level definition register

Bit Name Default Function

Comments(1)

droff7 0

2 Ohm

Antenna drivers are composed of eight binary weighted segments. Setting a bit droff to 1 will

disable corresponding segment during normal non-modulated operation.

The TX drivers are made up of 8 segments, binary weighted from 2 to 256 Ohm (nominal).

As an example, setting this register to 0xC0 disables the 2 Ohm and 4 Ohm segments.

droff6 0

4 Ohm

droff5 0

8 Ohm

droff4 0

16 Ohm

droff3 0

32 Ohm

droff2 0

64 Ohm

droff1 0

128 Ohm

droff0 0

256 Ohm

1. Default setting takes place at power-up and after Set Default command.

Applying value FFh to the register 27h will put the drivers in tristate.

ST25R3911B

Registers

DS11793 - Rev 6

page 81/116

ST25R3911B Datasheet(PDF) 81 Page - STMicroelectronics

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