MAS6503 datasheet(9/34 Pages) MAS

9 / 34 page

DA6503.005

14 December 2016

9 (34)

OPERATING MODES

After connecting the power supply the device is

reset by on-chip power on reset (POR) circuit and

then set to standby mode. The POR circuit works

only for supply voltage rise rates faster than max

1ms rise time. To provide reset in all supply rise

conditions it is recommended to reset the device

manually after every power up (VDD rise) either via

the XCLR pin or via the serial bus using the reset

MAS6503 has three operating modes, pressure,

temperature and VDD level monitoring mode. In the

pressure mode the pressure dependent sensor

bridge voltage is connected to the ADC input. In the

temperature measurement mode the resistive

sensor bridge is connected into a Wheatstone

bridge configuration together with four internal

resistors

(see

Temperature

Measurement

Configuration

the

Application

Information

chapter). The formed Wheatstone bridge output

voltage is connected to the ADC input. It is

proportional to absolute temperature. In the VDD

level monitoring mode an internal bandgap voltage

is connected to the ADC input but the ratiometric

ADC references are allowed to follow supply

voltage by disabling the internal regulator. The

supply voltage monitoring can be useful feature

especially in battery operated systems.

Switching between pressure, temperature and VDD

level monitoring modes is done via the single ADC

control register. The measurement configuration

includes selection of over sampling ratio, input

signal range, offset and sensor resistance. By

writing two 8-bit configuration data to two ADC

control registers a new A/D conversion is started.

MAS6503 includes a 256-bit EEPROM memory for

storing trimming and calibration data on chip. 16-

bits of EEPROM are reserved for internal oscillator

trimming and programmable I2C device address

but the remaining 240-bits are free for calibration

and other data.

The stored calibration data should comprise of

calibration

and

temperature

compensation

coefficients which can be used to calculate

accurate calibrated pressure and temperature

measurement results from the non-calibrated

measurement results. All calculations need to be

done in the external micro controller unit (MCU).

A calibrated MAS6503 sensor system is operated

as illustrated in figure 2. The calibration and

compensation coefficients need to be read to the

MCU memory only once. From each pair of

pressure and temperature measurements results

the accurate pressure and temperature values are

then calculated by using the external MCU.

All communication with MAS6503 is done using a

4-wire SPI bus or a 2-wire I2C bus. Starting an A/D

conversion, reading out the conversion result and

reading and writing data from and to the EEPROM

memory are all accomplished via serial bus

communication.

In addition to the serial bus the digital interface

includes also end-of-conversion (EOC) and master

reset (XCLR) pins. See Serial interface in the

following Serial Data Interface Control chapter.

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