MAS6510 datasheet(2/32 Pages) MAS

2 / 32 page

DA6510.009

6 September, 2018

2 (32)

BLOCK DIAGRAM

Figure 1. MAS6510 block diagram

FUNCTIONAL DESCRIPTION

MAS6510 can interface both single and dual

capacitance sensors. Single capacitance sensors

should be connected between CS and CC inputs.

The second capacitor of a dual capacitance sensor

should be connected between CR and CC inputs.

A Capacitance-to-Digital Converter (CDC) converts

the input capacitances into a 24-bit output word

(CODE). The converter front-end can be configured

either

for

capacitance

difference

(CS-CR)

capacitance ratio (CS-CR)/CS measurement mode.

The ratio mode offers pre-linearization for sensor

signals CS(x) being proportional to ~1/x such as

pressure sensor signals (x=pressure).

Converter resolution is selected by the over

sampling

ratio

(OSR)

setting.

Higher

OSR

corresponds to higher resolution but also longer

conversion time.

There are two internal 22pF capacitance matrices

connected to the CS and the CR inputs. These

matrices are used for sensor offset calibration and

they

are

programmable

8-bit

(86.3fF/step).

The gain is also programmable with 8-bit resolution

and it sets input range for sensor changing

capacitance

C=CS MAX-CS_MIN.

MAS6510 includes an internal temperature sensor

for

temperature

compensation

purposes.

multiplexer in the front-end is used to select the

external capacitive sensor, the internal temperature

sensor or an internal band gap reference voltage in

the VDD level monitoring mode.

Trim and calibration coefficients can be stored in the

256-bit EEPROM memory. In normal mode the

stored trim values for the oscillator frequency, offset

capacitance and gain are automatically read from

the EEPROM memory in the beginning of each

conversion. However, by using Trimming control

values from the trimming registers instead of

EEPROM.

To avoid modification of the EEPROM by mistake

there is an EEPROM write enable bit in the EEPROM

Control Register which needs to be set high (1)

before any changes can be done to the EEPROM.

MAS6510 has an internal clock oscillator making an

external clock unnecessary. To save power it

’s

turned on only when a conversion is running. The

frequency is factory trimmed to 200 kHz using a 6-bit

pin, can however be used when a specific test mode

is chosen. This may be necessary when measuring

larger capacitances which require a slower clock

frequency than which is supported by internal

options.

In temperature measurement mode it is necessary to

always use a regulated supply voltage. This is

achieved by enabling an internal 1.8V voltage

regulator. When enabled the internal regulator is

automatically turned on during conversion and off

when conversion has been finished. Note that the

internal regulator should be enabled only in the

temperature measurement mode but kept disabled

during capacitance and VDD monitoring modes.

MISO

SDA/MOSI

SCL/SCLK

MUX

TEMP



CONTROL

I2C /

SPI

EEPROM

CLK

OSC

XCS

XSPI

EOC

XCLR

VDD

GND

VREG

TEST

VREG

TEST1

TEST2

VDD

OSC

CS_INT

R_INT

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