MAS6505 datasheet(19/44 Pages) MAS

19 / 44 page

DA6505.005

11 June 2018

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CONTROL REGISTER (EF/6FHEX)

The

Control

(EF/6FHEX)

contains

measurement

and

operating

mode

selection

settings. Writing to Control register starts the

selected measurements. See table 4.

There are oversampling ratio (OSR) settings for

temperature and pressure. The OSRT setting is for

temperature and OSRP for pressure measurement.

Each of them has seven settings 1/4x, 1/2x, 1x, 2x,

4x, 8x and 16x in addition to no measurement

setting. Thus it is possible select only temperature or

pressure measurement or both measurements. The

oversampling ratio setting affects measurement

resolution and speed and power consumption. The

highest value setting gives the highest resolution but

it has the longest A/D conversion time and the

highest power consumption. Similar way the lowest

value setting gives the lowest resolution but it has

the shortest A/D conversion time and the lowest

power consumption. Thus the multiple oversampling

ratio

settings

allow

optimizing

measurements

between speed, power consumption and resolution.

See ELECTRICAL CHARACTERISTICS on pages

3-7.

The MODE bits select from three operating modes.

The MODE=00 setting selects sleep mode in which

there are no measurements performed and only a

very small sleep current is drawn from the supplies.

The MODE=01 or 10 setting selects forced mode

which runs selected measurements only once after

which the device returns automatically to the sleep

mode.

The MODE=11 setting selects normal mode in which

selected

measurements

are

performed

automatically

loop.

The

delay

between

measurements is configured by DELAY bit setting in

the Configuration register (EE/6EHEX). To minimize

current consumption the device enters standby

mode for the time between measurements during

which only the internal clock oscillator is running.

The automatic measurements are stopped by setting

MODE=00 which selects the sleep mode.

Table 4. Control register (EF/6FHEX) description

Bit

Number

Bit

Name

Description

Value

Function

7-5

OSRT

Oversampling ratio

for temperature

measurement

000

001

010

011

100

101

110

111

No temperature measurement (default)

1/4x Very fast mode

1/2x Fast mode

1x Ultra low power

2x Low power

4x Standard resolution

8x High resolution

16x Ultra high resolution

4-2

OSRP

Oversampling ratio

for pressure

measurement

000

001

010

011

100

101

110

111

No pressure measurement (default)

1/4x Very fast mode

1/2x Fast mode

1x Ultra low power

2x Low power

4x Standard resolution

8x High resolution

16x Ultra high resolution

1-0

MODE

Operating mode

01, 10

Sleep mode (default)

Forced mode (single command based measurement)

Normal mode (automated measurements)

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