MAS6512 datasheet(12/32 Pages) MAS

12 / 32 page

DA6512.003

2 December, 2016

12 (32)

MEASUREMENT CONTROL REGISTER (E2/62HEX)

This register is used to configure and initiate a

measurement. See table 3 below. A new conversion

is started simply by writing 8-bit configuration data

having SCO=1 to the measurement control register

(E2/62HEX).

Table 3. Measurement control register (E2/62HEX) description

Bit Number

Bit Name

Description

Value

Function

7-5

OSRS

Over Sampling Ratio

(OSR) Selection

000

001

010

011

OSR = 256

OSR = 512

OSR = 1024

OSR = 2048

TEMPREGEN

Temperature Mode

Regulator Enable

Voltage regulator disabled

Voltage regulator enabled

SCO

Start Conversion

No conversion

Start conversion

2-1

SEL

Capacitive/ VDD

Monitoring /

Temperature Selection

External capacitive sensor

VDD level monitoring

Internal temperature sensor

XRC

Front end function

selector

Ratio converter

Difference converter

The OSRS over sampling ratio selection bits

choose between four different OSR values. High

OSR value corresponds to high resolution but also

longer

conversion

time.

See

Electrical

characteristics for further details.

The TEMPREGEN bit enables/disables the internal

temperature mode voltage regulator. The regulator

need to be enabled (TEMPREGEN=1) only in

temperature mode and it should be disabled

(TEMPREGEN=0)

capacitance

and

VDD

monitoring modes. When enabled the regulator is

turned on during conversions and automatically

turned off after each conversion to save power.

Note also that if in Test register FOSC=1 and if

TEMPREGEN=1 the regulator is forced on all the

time even when measurement is not running.

The SCO Start conversion bit needs to be set 1 for

every new measurement. It is automatically reset to

0 after each measurement.

The SEL sensor selection bits control the front-end

multiplexer.

connects

either

the

external

capacitive sensor (SEL=00), VDD level monitoring

voltage (SEL=01) or the internal temperature sensor

(SEL=10) to the

-converter.

The XRC bit selects between two external

capacitive sensor measurement modes. The XRC

bit selection does not have any effect on

temperature

VDD

level

monitoring

measurements. In Ratio converter mode the output

will be proportional to capacitance ratio (CS-CR)/CS.

In Difference converter mode the output will be

proportional to capacitance difference (CS-CR).

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