MAS6503 datasheet(16/34 Pages) MAS

16 / 34 page

DA6503.005

14 December 2016

16 (34)

MEASUREMENT CONTROL REGISTER 2 (E3/63HEX)

Measurement

control

(E3/63HEX)

configures second half of the measurement settings

and also starts the measurement. See table 4.

OSRS bits select over sampling ratio (OSR) setting

from five options. The OSR selection affects both

measurement resolution and conversion time. The

best resolution is achieved at highest OSR setting

4096 but the conversion time is longest. The fastest

conversion is achieved at lowest OSR setting 256

but the achieved resolution is lowest. Typically

highest OSR setting is used only in the most

precise

measurement

such

pressure

measurement. Medium or lowest OSR setting is

typically sufficient in the temperature measurement.

The lowest OSR setting can be used in the least

precision VDD level monitoring measurement.

RSENSOR bits select sensor resistance from eight

options from 2.0kΩ up to 10 kΩ. Selecting proper

RSENSOR according to sensor resistance is

important only for the temperature measurement

mode.

See

also

Temperature

Measurement

Configuration in the Application Information section.

PTS bits select between three measurement

modes; pressure, temperature and VDD level

monitoring modes.

The conversion starts right after writing data byte to

the Measurement control register 2. Thus to start

new conversion the measurement configuration

data has to be written first to Measurement control

measurement

the

serial

communication

with

MAS6503 should be kept idle during conversions.

The EOC pin goes low when the conversion starts

and it returns back high when the conversion is

ready.

Table 4. Measurement control register 2 (E3/63HEX) description

Bit Number

Bit Name

Description

Value

Function

7-5

OSRS

Over Sampling Ratio

(OSR) Selection

000

001

010

011

100

OSR = 256

OSR = 512

OSR = 1024

OSR = 2048

OSR = 4096

4-2

RSENSOR

Sensor Resistance

000

001

010

011

100

101

110

111

2.0kΩ

2.5kΩ

3.0kΩ

3.5kΩ

4.0kΩ

4.5kΩ

5.0kΩ

10.0kΩ

1-0

PTS

Pressure/

Temperature/

VDD Level Monitoring

Mode Selection

Temperature mode

VDD level monitoring mode

Pressure mode

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