MAS6512 datasheet(8/32 Pages) MAS

8 / 32 page

DA6512.003

2 December, 2016

8 (32)

OPERATING MODES

MAS6512 has two capacitance measurement

modes, a temperature measurement mode and a

VDD level monitoring mode. In capacitance

measurement mode the output is proportional to

either

capacitance

difference

(CS-CR)

capacitance

ratio

(CS-CR)/CS.

temperature

measurement mode the output is proportional to the

absolute temperature. The VDD level monitoring

mode allows measuring supply voltage which can

be useful especially in battery operated systems.

Measurement mode configuration and start of

conversion is done by writing 8-bit configuration

data to the Measurement control register (address

E2HEX). See further details in the Measurement

control register chapter.

MAS6512 includes a 256-bit EEPROM memory for

storing trim and calibration data on chip. Five bytes

(40 bits) of EEPROM are reserved for trim values

and programmable I2C device address but the

remaining 27 bytes (216 bits) are free for storing

sensor calibration and other data.

The stored trim data consists of capacitive front-end

offset and gain setting data that are automatically

read from EEPROM memory in the beginning of

each conversion (in normal operating mode). The

programmable I2C device address is read from

EEPROM memory only during power on reset or by

manual reset using XCLR or the reset register.

The stored calibration data should comprise of

calibration

and

temperature

compensation

coefficients that can be used to calculate accurate

sensor and temperature measurement results from

the non-calibrated measurement readings. All

calculations need to be done in an external micro

controller unit (MCU) which controls the MAS6512.

A calibrated MAS6512 sensor system should be

operated as illustrated in figure 2. Connecting VDD

triggers power-on-reset (POR) but to make sure the

device is reset an additional reset should be given

using the XCLR pin or writing any data on the reset

The calibration and compensation coefficients are

necessary to be read to the MCU memory only

once. From each pair of sensor and temperature

measurement readings and using the calibration

coefficients the accurate sensor and temperature

values can then be calculated in the external MCU.

All communication with MAS6512 is done using

either the I2C bus or the SPI bus. Starting an A/D

conversion, reading 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 buses the digital interface

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

reset (XCLR) pins. See A/D Conversion in the Serial

Data Interface (I2C Bus) Control chapter.

Figure 2. Flow chart for a calibrated MAS6512 sensor system

POWER UP / RESET

Reset device by XCLR or

by writing any data to the reset register E0/60HEX

READ EEPROM

CALIBRATION DATA

MEASURE SENSOR

MEASURE TEMPERATURE

CALCULATE CALIBRATED

TEMPERATURE

CALCULATE TEMPERATURE

COMPENSATED SENSOR VALUE

MAS6512 数据表(PDF) 8 Page - Micro Analog systems

MAS6512 数据表(HTML) 8 Page - Micro Analog systems

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