MAS6503 datasheet(2/34 Pages) MAS

2 / 34 page

DA6503.005

14 December 2016

2 (34)

BLOCK DIAGRAM

Figure 1. MAS6503 block diagram

FUNCTIONAL DESCRIPTION

MAS6503 has one input channel suitable for a

piezoresistive pressure sensor. There are four input

signal conversion ranges and eight offset values

selectable to meet various sensor signal ranges.

In addition the device can be configured for

temperature measurement. The temperature is

typically needed for temperature compensation and

indication purposes. The device supports eight

different sensor bridge resistance values from

2.0kΩ up to 10kΩ.

MAS6503 also features VDD level monitoring which

is useful especially in battery operated systems.

The VDD level information could be used for battery

energy capacity indication, switching between

different power modes in the system and also for

VDD dependency compensation purposes. In the

VDD level monitoring mode the on-chip regulator

need to be disabled.

The AD-converter is ratiometric offering possibility

to run measurements at varying supply voltage

conditions. However the device has also an

optional voltage regulator with four selectable

output voltage options 1.8V, 2.2V, 2.6V and 2.9V.

The on-chip voltage regulator offers additional

regulation against supply noise and variations. Note

that in the VDD level monitoring mode the on-chip

voltage regulator needs to be disabled.

The AD-converter resolution is selected by the over

sampling

ratio

(OSR)

setting.

Higher

OSR

corresponds to higher resolution but also longer

conversion time.

MAS6503 has an internal clock oscillator making an

external clock unnecessary. To save power the

clock oscillator and the optional voltage regulator

are turned on only when a conversion is running.

The oscillator frequency is factory trimmed to 500

kHz using a 6-bit register. The converter runs from

a system clock which is half of the oscillator

frequency. In a specific test mode an external clock

signal can be also used when connected to the

OSC pin.

Communication with MAS6503 is handled by the

serial interface compatible with either a bi-

directional 2-wire I2C bus or a 4-wire SPI bus. The

XSPI pin is for selecting which bus type is used.

In addition to a fixed I2C device address the

MAS6503 has also a programmable device

address. It has been factory programmed to same

value as the fixed device address of MAS6503.

When unique device address is needed it can be

programmed to EEPROM address (DE/5EHEX)..

Note: The 2-wire I2C bus of MAS6503 supports

only basic I2C bus communication protocol but not

for example 10-bit addressing, arbitration and clock

stretching features of the I2C bus specification.

The 256-bit EEPROM memory is available for

storing trimming and calibration data on chip. Two

of the EEPROM bytes are reserved for dedicated

function. One is for internal clock oscillator trimming

value and the another one for programmable I2C

address value but the remaining 240 bits are free

for storing calibration and other information.

ADC

COMMON

VDD

GND

VREG

CONTROL

VREFN

VREFP

TEST

I2C/

SPI

OSC

EEPROM

SDA/MOSI

SCL/SCLK

TE3

EOC

XCLR

TE1

TE2

MAS6503

MISO

XCS

XSPI

VDD

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