S2-LPS datasheet(58/73 Pages) STMICROELECTRONICS

номер детали	S2-LPS

подробное описание детали	Ultra-low power, high performance, sub-1 GHz transceiver

PDF	73 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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58 / 73 page

Name

Addr

Default

Bit

Field name

Description

VCO_CALIBR_IN0

7:0

RESERVED

XO_RCO_CONF1

7:5

RESERVED

PD_CLKDIV

1: disable both

dividers of digital clock

(and reference clock

for the SMPS) and IF-

ADC clock.

3:0

RESERVED

XO_RCO_CONF0

EXT_REF

•

0: reference

signal from XO

circuit

•

1: reference

signal from XIN

pin.

6:4

GM_CONF

Set the driver gm of

the XO at start up.

REFDIV

1: enable the

the reference clock

divider.

RESERVED

EXT_RCO_OSC

1: the 34.7 kHz signal

must be supplied from

any GPIO.

RCO_CALIBRATION

1: enable the

automatic RCO

calibration.

RCO_CALIBR_CONF3

7:4

RWT_IN

RWT word value for

the RCO.

3:0

RFB_IN[4:1]

MSB part of RFB word

value for RCO.

RCO_CALIBR_CONF2

RFB_IN[0]

LSB part of RFB word

value for RCO.

6:0

RESERVED

PM_CONF4

7:6

RESERVED

EXT_SMPS

1: disable the internal

SMPS.

4:0

RESERVED

PM_CONF3

KRM_EN

•

0: divider by 4

enabled (SMPS'

switching

frequency is

FSW=Fdig/4)

•

1: rate multiplier

enabled (SMPS'

switching

frequency is

FSW=KRM*Fdig

/(2^15).

6:0

KRM[14:8]

Sets the divider

ratio (MSB) of the

rate multiplier (default:

Fsw=Fdig/4)

S2-LPS

DS13831 - Rev 1

page 58/73

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