S2-LPS datasheet(48/73 Pages) STMICROELECTRONICS

48 / 73 page

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 Eq.

(15).

MOD4

7:0

DATARATE_M[15:8]

The MSB of the

mantissa value of the

data rate equation,

see Eq. (13) .

MOD3

7:0

DATARATE_M[7:0]

The LSB of the

mantissa value of the

data rate equation,

see Eq. (13).

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

•

11: 4-GFSK

BT=0.5

3:0

DATARATE_E

The exponent value of

the data rate equation

(see Eq. (13)).

MOD1

PA_INTERP_EN

1: enable the

PA power

interpolator (see

Section 4.4.6.1 PA

configuration).

MOD_INTERP_EN

1: enable frequency

interpolator for the

GFSK shaping (see

Section 4.4.1.1 Gaus

sian shaping).

5:4

CONST_MAP

Select the

constellation map for

4-(G)FSK or 2-(G)FSK

modulations (see

Table 34. Constellation

mapping 2-

(G)FSK and

Table 35. Constellation

mapping 4-(G)FSK).

3:0

FDEV_E

The exponent value

of the frequency

deviation equation,

see Eq. (9).

MOD0

7:0

FDEV_M

The mantissa value

of the frequency

deviation equation,

see Eq. (9).

S2-LPS

DS13831 - Rev 1

page 48/73

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