STPMS2 datasheet(26/36 Pages) STMICROELECTRONICS

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Theory of operation

STPMS2

26/36

DocID16525 Rev 5

Table 12: Pins for SPI communication

Function

Description

MS0

SCL

Clock input

MS1

TDI

Data input

MS2

TDS

Enable

MS3

CLK

SPI operation

Table 13: Description of output signals and configuration bits CFG[39:0]

Hard

mode

Soft

mode

Internal

signal

Description

MS0

CFG[0]

LP/HP

Operating mode:

LP/HP=0: LPR

LP/HP=1: HPR

MS0

CFG[1]

GAIN

Gain selector of current channel preamplifier:

GAIN=0: x2

GAIN=1: x4

GAIN=2: x8

GAIN=3: x16

MS0

CFG[2]

MS1

CFG[3]

Temperature compensation of voltage reference:

TC=0: 50 ppm/°C

TC=1: -140 ppm/°C

TC=2: 130 ppm/°C

TC=3: -40 ppm/°C

MS1

CFG[4]

MS2

CFG[5]

DOMUL

Output multiplexer enable: DOMUL=0: outputs not

multiplexed DOMUL=1: outputs multiplexed

MS2

CFG[6]

PDV

Power-down of voltage modulator: PDV=0: voltage modulator

on PDV=1: voltage modulator off

MS3

CFG[7]

EBISTC

Current modulator BIST DAC enable:

EBISTC=0: BISTC disabled

EBISTC=1: BISTC enabled

Please see Table 14: "EBISTC" for details

MS3

CFG[8]

EBISTV

Voltage modulator BIST DAC enable:

EBISTC=0: BISTV disabled

EBISTC=1: BISTV enabled

Please, see Table 15: "EBISTV" for details

MS3

CFG[9]

EINCHPC

CIP, CIN input pin enable: EINCHPC=0: CIN CIP disabled

EINCHPC=1: CIN CIP enabled

MS3

CFG[10]

EINCHPV

VIP, VIN input pin enable: EINCHPC=0: VIN VIP disabled

EINCHPC=1: VIN VIP enabled

CFG[11]

ECHPLFC

Low frequency chopper of current modulator enable:

ECHPLFC=0: LFC disabled ECHPLFC=1: LFC enabled

CFG[12]

LFC of current channel frequency selector. Please see Table

16: "MC[2:0]" for details

CFG[13]

CFG[14]

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