MAS6505 datasheet(15/44 Pages) MAS

15 / 44 page

DA6505.005

11 June 2018

15 (44)

MAS6505 includes a 64 byte (512 bit) non-volatile

EEPROM data memory and twenty registers. See

table 1 on the previous page presenting register and

EEPROM data addresses of the MAS6505. The

address values differ whether I2C or SPI serial bus

communication is used.

In the SPI serial bus the address bit A7 selects

between write (A7=0) and read (A7=1) operation.

In the I2C serial bus the address bit A7 value is

always one (A7=1). Selection between write and

read operation is done by the LSB bit of the I2C

device address (write LSB=0, read LSB=1) but the

read operation. The MAS6505 I2C device address is

EA/EBHEX for write/read. See also Table 12.

The first 58 bytes (464 bits) of EEPROM memory

(addresses 80/00HEX

…B9/39HEX) are free for storing

sensor calibration and other data. The last six

EEPROM memory bytes (48 bits) are reserved for

trim data purposes and they are marked with note

“E+T” in the Table 1. EEPROM oscillator frequency

trim address (BA/3AHEX) must be left untouched

since it contains factory trimming value of the internal

EEPROM

oscillator.

Temperature

sensor

configuration EEPROM address (BB/3BHEX) is for

storing the temperature sensor selection and bridge

resistance

trim

settings.

Pressure

gain

trim

EEPROM address (BC/3CHEX) is for storing pressure

measurement AFE gain trim settings. Similarly

Temperature

gain

trim

EEPROM

address

(BD/3DHEX)

for

storing

the

temperature

measurement AFE gain trim settings. Temperature

and

pressure

offset

trim

EEPROM

address

(BE/3EHEX) is for storing the temperature and

pressure measurement ADC offset trim settings. The

last EEPROM memory byte (8 bits) in the EEPROM

address BF/3FHEX is reserved for storing trimming

value of factory trimmed internal 250 kHz clock

oscillator. Also this EEPROM address must be left

untouched to not lose the factory trimming value.

Reset register (EC/6CHEX) does not contain any data.

Writing any data byte to this register forces a device

reset. The reset initializes all control registers

(addresses EDHEX

…FFHEX) to a default zero value.

EEPROM control register (ED/6DHEX) is used for

activating EEPROM (EON bits) which is necessary

in both EEPROM read and write. Additionally for

write operation the EEPROM has to be enabled for

write (EWE bits) since by default the EEPROM write

is disabled. See table 2.

The Configuration register (EE/6EHEX) contains delay

and IIR filter measurement configuration settings

and also selection between 4- and 3- wire modes of

the SPI bus. See table 3.

The

Control

(EF/6FHEX)

contains

measurement

resolution

and

operating

mode

selection settings. Writing to the Control register

starts the selected measurements. See table 4.

The Status register (F0HEX) contains various status

flags. The FIRSTT and FIRSTP flags are for internal

use only. When being high (1) they indicate that the

running measurement is the first one after starting

the normal mode (continuous) measurements. The

forced mode measurements (single measurements)

are always considered as first measurements so the

FIRSTT and FIRSTP are always high (1) for them.

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. Checking status of

these two flags can be used to decide when to read

out new measurement results. See table 5.

The 24-bit measurement result of pressure is stored

into three registers F1HEX (MSB, most significant

byte), F2HEX (LSB, least significant byte), F3HEX

(XLSB, extra least significant byte).

The 24-bit measurement result of temperature is

stored into three registers F4HEX (MSB, most

significant byte), F5HEX (LSB, least significant byte),

F6HEX (XLSB, extra least significant byte).

Three Test input data registers (F7/77…F9/79HEX)

are for IIR filter testing purpose only.

Trim and test register (FA/7AHEX) is for trimming and

testing purposes. The TRIM bits define whether the

trim settings are taken from the EEPROM TRIM=00

(default setting) or from the corresponding trim data

registers TRIM<>00. See table 6 for details. The

Trimming mode (TRIM=01 or 10) is for trimming the

temperature sensor and also the AFE gain and the

ADC offset in both temperature and pressure

measurements. There is also Trim test mode

(TRIM=11) but it is for internal clock oscillator

trimming and testing purpose only.

There are five trim data registers in addresses

FB/7BHEX

…FF/7FHEX. They have equivalent function

storage

space

the

non-volatile

EEPROM

addresses BB/3BHEX

… BF/3FHEX. When selecting

the Trimming mode (TRIM=01 or 10) in the Trim and

test register the temperature sensor, AFE gain and

ADC offset trimming can be done using fast register

write operation instead of using much slower

EEPROM write operations. After optimal trim register

values are found they can be stored into the

corresponding EEPROM trim data addresses. In the

default TRIM=00 setting all the stored trimming

settings will be automatically read to registers from

the EEPROM memory in the beginning of each

measurement.

MAS6505 数据表(PDF) 15 Page - Micro Analog systems

MAS6505 数据表(HTML) 15 Page - Micro Analog systems

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MAS6505 数据表(PDF) 15 Page - Micro Analog systems

MAS6505 数据表(HTML) 15 Page - Micro Analog systems

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