MAS6505 datasheet(10/44 Pages) MAS

10 / 44 page

DA6505.005

11 June 2018

10 (44)

FUNCTIONAL DESCRIPTION (continued)

 Reading measurement results

MAS6505 pressure and temperature measurement

results are 24-bit unsigned numbers each of which

are stored into three 8-bit result registers. The

pressure result addresses are MSB byte (F1HEX),

LSB byte (F2HEX) and XLSB byte (F3HEX). The

temperature result addresses are MSB byte (F4HEX),

LSB byte (F5HEX) and XLSB byte (F6HEX).

MAS6505 A/D conversion and result status can be

monitored

from

Status

(F0HEX)

which

contains RDYT and RDYP flags to indicate when

there are unread temperature (T) and/or pressure

(P) measurement results available in the pressure

and temperature result registers. See figure 2 and

table 7. The corresponding RDYx (x=T or P) flag is

set (1) when a new measurement is ready for a read.

Reading the measurement result will clear (0) the

corresponding RDYx (x=T or P) flag.

The decision when to read measurement results can

be made by polling the Status register and waiting

until the flag(s) of selected measurement(s) (RDYT

and/or RDYP flags) have been set high. This method

can be used in both forced and normal modes. In

forced mode an another choice is to wait at least

maximum A/D conversion time before reading the

result. See also figure 3 for Calibrated MAS6505

sensor system measurement flow. In normal mode it

is also possible to read results at a rate when new

results are expected to be ready. This is possible

since MAS6505 has internal A/D conversion result

memory buffer. If new result is finished during read

of result registers the new value is updated result

registers only after the serial bus communication has

been released. Important note: In normal mode

the

results

must

always

read

using

incremental read (all three bytes of each result or

all six bytes of both results at single read sequence)

to maintain A/D conversion data consistency. See

table 15 example of the incremental read in chapter

2-wire

serial

data

interface

(I2C

bus).

The

incremental read is recommended to be used also in

the forced mode.

Figure 2. Forced and normal mode measurement and status register RDYT and RDYP flag update timing

(T=temperature, P=pressure)

T or P

DELAY setting

Forced mode

temperature

or pressure

Forced mode

temperature

and pressure

Normal mode

temperature

or pressure

Normal mode

temperature

and pressure

T or P

T P

time

RDYT or RDYP

flag set

RDYT

flag set

RDYP

flag set

RDYT or RDYP

flag set

RDYT or RDYP

flag set

Measurement start by setting MODE=01 or 10

Measurement start by setting MODE=11

T P

DELAY setting

time

RDYT

flag set

RDYP

flag set

RDYT

flag set

RDYP

flag set

Measurement start by setting MODE=11

T or P

DELAY setting

T or P…

...

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