S2-LP datasheet(77/90 Pages) STMICROELECTRONICS

77 / 90 page

S2-LP

DocID029944 Rev 1

77/90

Name

Addr

Default

Bit

Field name

Description

CHNUM

7:0

CH_NUM

Channel number. This value is multiplied by the

channel spacing and added to the synthesizer base

frequency to generate the actual RF carrier frequency

(see Equation 3).

MOD4

7:0

DATARATE_M[15:8]

The MSB of the mantissa value of the data rate

equation (see Equation 10).

MOD3

7:0

DATARATE_M[7:0]

The LSB of the mantissa value of the data rate

equation (see Equation 10).

MOD2

7:4

MOD_TYPE

Modulation type:



0: 2-FSK



1: 4-FSK



2: 2-GFSK BT=1



3: 4-GFSK BT=1



5: ASK/OOK



7: unmodulated



10: 2-GFSK BT=0.5



12: 4-GFSK BT=0.5

3:0

DATARATE_E

The exponent value of the data rate equation (see

Equation 10).

MOD1

PA_INTERP_EN

1: enable the PA power interpolator (see Section

5.6.1).

MOD_INTERP_EN

1: enable frequency interpolator for the GFSK shaping

(see Section 5.4.1.1).

5:4

CONST_MAP

Select the constellation map for 4-(G)FSK or 2-

(G)FSK modulations (see Table 38 and Table 39).

3:0

FDEV_E

The exponent value of the frequency deviation

equation (see Equation 7).

MOD0

7:0

FDEV_M

The mantissa value of the frequency deviation

equation (see Equation 7).

CHFLT

7:4

CHFLT_M

The mantissa value of the receiver channel filter (see

Table 41).

3:0

CHFLT_E

The exponent value of the receiver channel filter (see

Table 41).

AFC2

AFC_FREEZE_ON_SYNC

1: enable the freeze AFC correction upon sync word

detection.

AFC_ENABLED

1: enable the AFC correction.

AFC_MODE

Select AFC mode:

0: AFC loop closed on slicer

1: AFC loop closed on second conversion stage.

4:0

RESERVED

AFC1

7:0

AFC_FAST_PERIOD

The length of the AFC fast period.

AFC0

7:4

AFC_FAST_GAIN

The AFC loop gain in fast mode (2's log).

3:0

AFC_SLOW_GAIN

The AFC loop gain in slow mode (2's log).

RSSI_FLT

7:4

RSSI_FLT

Gain of the RSSI filter.

3:2

CS_MODE

Carrier sense mode:



00b: Static CS



01b: Dynamic CS with 6dB dynamic threshold



10b: Dynamic CS with 12dB dynamic threshold



11b: Dynamic CS with 18dB dynamic

threshold.

(see Section 5.5.8.2)

1:0

RESERVED

RSSI_TH

7:0

RSSI_TH

Signal detect threshold in 1 dB steps. The RSSI_TH

can be converted in dBm using the formula RSSI_TH-

146.

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