MAS6505 datasheet(20/44 Pages) MAS

20 / 44 page

DA6505.005

11 June 2018

20 (44)

STATUS REGISTER (F0HEX)

The Status register (F0HEX) contains various status

flags. See table 5. The ERDY flag goes low

(ERDY=0)

during

EEPROM

read

and

write

operations to indicating EEPROM being busy. After

EEPROM operation is finished the ERDY flag

returns high (ERDY=1). The FIRSTT and FIRSTP

flags are for internal use only. When being high they

indicate that the running measurement is the first

one after starting the measurements. They are reset

right after the first measurement has ended.

The RDYT and RDYP flags indicate when unread

temperature and pressure results are available at the

result registers. Polling status of these two flags can

be used to decide when to read out the new

measurement results. Reading data from any of the

three Pressure result registers (F1…F3HEX) clears

the RDYP flag (RDYP=0). Reading data from any of

the three Temperature result registers (F4…F6HEX)

clears the RDYT flag (RDYT=0).

Table 5. Status register (F0HEX)

Bit Number

Bit Name

Description

Value

Function

7-5

000

ERDY

EEPROM busy

EEPROM ready

FIRSTT

Not first T measurement

First run T measurement

FIRSTP

Not first run P measurement

First run P measurement

RDYT

No unread T result available

Unread T result available

RDYP

No unread P result available

Unread P result available

T = temperature, P = pressure

PRESSURE MEASUREMENT RESULT REGISTERS (F1…F3HEX)

The measurement result of pressure is stored into

three read only type Pressure measurement result

registers in addresses F1…F3HEX. MSB (most

significant byte) is at F1HEX, LSB (least significant

byte) at F2HEX and XLSB (extra least significant byte)

at F3HEX. If IIR low pass filtering is selected

(FILTER<>000 in the Configuration registers) the

pressure measurement result registers contain

filtered value of measurement results.

TEMPERATURE MEASUREMENT RESULT REGISTERS (F4…F6HEX)

The measurement result of temperature is stored

into three read only type Temperature measurement

result registers in addresses F4…F6HEX. MSB (most

significant byte) is at F4HEX, LSB (least significant

byte) at F5HEX and XLSB (extra least significant byte)

at F6HEX. If IIR low pass filtering is selected

(FILTER<>000 in the Configuration registers) the

temperature measurement result registers contain

filtered value of measurement results.

TEST INPUT DATA REGISTERS (F7/77…F9/79HEX)

The three bytes of Test input data registers

(F7/77…F9/79HEX) are for testing purpose only. By

the Trim and test register (FA/7AHEX) setting

SCALC=1 it is possible to choose taking data for the

temperature and pressure result IIR low pass filters

from the Test input data registers. This test mode

allows testing temperature and pressure result IIR

low pass filters with any 24-bit input data. In normal

operation (SCALC=0) the input data for the IIR filters

are the latest temperature and pressure conversion

results. Filtered temperature and pressure results

are stored into the Temperature result registers

(F4/74…F6/76HEX) and the Pressure result registers

(F1/71…F3/73HEX) respectively.

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