MAS6502 datasheet(8/20 Pages) MAS

8 / 20 page

DA6502.008

29 November 2012

8 (20)

ADC CONTROL REGISTER

Table 2. MAS6502 ADC control register bit description

Bit Number

Bit Name

Description

Value

Function

7-6

OSRS

Over Sampling Ratio

(OSR) selection

OSR = 512

OSR = 256

OSR = 128

OSR = 64

PTS

Pressure/Temperature

Selection

Pressure Measurement

Temperature Measurement

4-3

ISR

Input Signal Range

325 mV (260 mV linear range)

220 mV (176 mV linear range)

150 mV (120 mV linear range)

100 mV (80 mV linear range)

OSSELECT

Offset Selection

+33 mV

No offset

1-0

RSSELECT

Sensor Resistance

Selection for

Temperature

Measurement Mode

Rsensor = 3.4 kΩ

Rsensor = 4.0 kΩ

Rsensor = 4.5 kΩ

Rsensor = 5.0 kΩ

MAS6502

has

ADC

control

for

configuring

the

measurement

setup.

new

conversion

started

simply by writing

8-bit

configuration data to the ADC control register. See

table 2 for ADC control register bit definitions. ADC

control register values are set via the 2-wire serial

data interface. Note: The device should not be

addressed via serial bus before the conversion has

been ended. Reading or writing to device during the

conversion may corrupt the conversion result.

The first two OSRS bits of the control register

defines four selectable over sampling ratios. The

higher the OSR is set the better is the ADC

resolution, but the conversion time gets longer.

The

PTS

bit

selects

between

pressure

and

temperature

measurement.

For

temperature

measurement the sensor is connected in the

Wheatstone bridge configuration together with four

integrated resistors. See figure 5 on page 15.

The ISR bits selects between four A/D input signal

ranges.

The OSSELECT bit is used to enable or disable an

offset for the input signal.

The two RSSELECT bits selects between four

sensor resistance options. The selection sets the

internal

resistor

value

balance

the

Wheatstone bridge circuit formed by the sensor

resistance and four internal resistors R1, R2, R3

and R4. See Electrical Characteristics for resistor

values.

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