ST25R3918 datasheet(78/141 Pages) STMICROELECTRONICS

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Application information

ST25R3918

78/141

DS13490 Rev 2

4.5.16

Receiver configuration register 3

Address: 0Dh

Type: RW

4.5.17

Receiver configuration register 4

Address: 0Eh

Type: RW

Table 38. Receiver configuration register 3

Bit

Name

Default

Function

Comments

rg1_am2

Gain reduction/boost in first gain

stage of AM channel.

0: Full gain

1-6: Gain reduction 2.5 dB per step (15 dB total)

7: Boost + 5.5 dB

rg1_am1

rg1_am0

rg1_pm2

Gain reduction/boost in first gain

stage of PM channel.

0: Full gain

1-6: Gain reduction 2.5 dB per step (15 dB total)

7: Boost + 5.5 dB

rg1_pm1

rg1_pm0

lf_en

0: HF signal on receiver input

1: LF signal on receiver input

lf_op

0: differential LF operation

1: LF input split (RFI1 to AM

channel, RFI2 to PM channel)

Table 39. Receiver configuration register 4(1)

Bit

Name

Default

Function

Comments

rg2_am3

AM channel: gain reduction in

second and third stage and

digitizer

Only values from 0h to Ah are used:

– settings 1h to 4h reduce gain by increasing the

digitizer window in 3 dB steps

– values from 5h to Ah additionally reduce the

gain in second and third gain stage, always in

3 dB steps.

rg2_am2

rg2_am1

rg2_am0

rg2_pm3

PM channel: gain reduction in

second and third stage and

digitizer

Only values from 0h to Ah are used:

– settings 1h to 4h reduce gain by increasing the

digitizer window in 3 dB steps

– values from 5h to Ah additionally reduce the

gain in second and third gain stage, always in

3 dB steps.

rg2_pm2

rg2_pm1

rg2_pm0

1. Direct command Reset RX gain is necessary to load the value of this register into AGC, Squelch, and RSSI block.

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