S2-LP datasheet(83/90 Pages) STMICROELECTRONICS

83 / 90 page

S2-LP

DocID029944 Rev 1

83/90

Name

Addr

Default

Bit

Field name

Description

VCO_CALIBR_IN2

7:4

VCO_CALAMP_TX

VCO magnitude calibration word (binary coding to be

internally converted in thermometric code) used in TX.

3:0

VCO_CALAMP_RX

VCO magnitude calibration word (binary coding to be

internally converted in thermometric code) used in

RX.

VCO_CALIBR_IN1

RESERVED

6:0

VCO_CALFREQ_TX

VCO Cbank frequency calibration word to be used in

TX.

VCO_CALIBR_IN0

RESERVED

6:0

VCO_CALFREQ_RX

VCO Cbank frequency calibration word to be used in

RX.

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.

5:4

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)

PM_CONF2

7:0

KRM[7:0]

Sets the divider ratio (LSB) of the rate multiplier

(default: Fsw=Fdig/4)

PM_CONF1

RESERVED

BATTERY_LVL_EN

1: enable battery level detector circuit.

5:4

SET_BLD_TH

Set the BLD threshold:



00b: 2.7V



01b: 2.5V



10b: 2.3V



11b: 2.1V.

SMPS_LVL_MODE



0: SMPS output level will depend upon the

value written in the PM_CONFIG0 register

(SET_SMPS_LEVEL field) both in RX and TX

state.



1: SMPS output level will depend upon the

value in PM_CONFIG register just in TX state,

while in RX state it will be fixed to 1.4 V

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