S2-LPSQTR datasheet(47/73 Pages) STMICROELECTRONICS

47 / 73 page

Name

Addr

Default

Bit

Field name

Description

GPIO3_CONF

•

01b: Digital input

•

10b: Digital

output low

power

•

11b: Digital

output high

power

SYNT3

7:5

PLL_CP_ISEL

Set the charge pump

current according to

the XTAL frequency

(see Table 30. Charge

pump words).

Synthesizer band

select. This parameter

selects the out-of loop

divide factor of the

synthesizer:

•

0: 4, band select

factor for high

band

•

1: 8, band select

factor for middle

band.

3:0

SYNT[27:24]

MSB bits of the PLL

programmable divider.

SYNT2

7:0

SYNT[23:16]

Intermediate bits

of the PLL

programmable

divider (see

Section 4.3.1 RF

channel frequency

settings ).

SYNT1

7:0

SYNT[15:8]

Intermediate bits

of the PLL

programmable

divider (see

Section 4.3.1 RF

channel frequency

settings).

SYNT0

7:0

SYNT[7:0]

LSB bits of the

PLL programmable

divider (see

Section 4.3.1 RF

channel frequency

settings).

IF_OFFSET_ANA

7:0

IF_OFFSET_ANA

Intermediate

frequency setting

for the analog RF

synthesizer, default:

300 kHz, see Eq. (14).

IF_OFFSET_DIG

7:0

IF_OFFSET_DIG

Intermediate

frequency setting for

the digital shift-to-

baseband circuits,

default: 300 kHz, see

Eq. (14).

CHSPACE

7:0

CH_SPACE

Channel spacing

setting, see Eq. (15).

S2-LPS

DS13831 - Rev 1

page 47/73

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