MAS6510 datasheet(10/32 Pages) MAS

10 / 32 page

DA6510.009

6 September, 2018

10 (32)

MAS6510 includes a 32 byte (256 bit) EEPROM data

memory and fourteen registers. 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. See table 1 on the

previous page for register and EEPROM data

addresses.

In the SPI serial bus the address bit A7 selects

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

the I2C serial bus A7 is always high (A7=1) and

selection between write and read operation is done

with the LSB bit of the I2C device address. See table

chapter

SERIAL

DATA

INTERFACE

CONTROL. The MAS6510 has both hard wired and

programmable

I2C

device

addresses.

The

programmable

device

address

factory

programmed to value EC HEX (%11101100) which is

the same as the hard wired device address of

MAS6510. When unique device address is needed

it can be programmed to the Programmable I2C

Device Address register (C2HEX). The MAS6510 will

respond to both hard wired and programmed I2C

device addresses.

MAS6510 has four trim registers: CS_INT capacitor

matrix register (E3/63HEX), CR_INT capacitor matrix

Oscillator frequency control register (E6/66HEX).

These are marked with “R+T” in table 1. Each of

these registers has a corresponding EEPROM byte

where trim values can be permanently stored. These

are marked with

“E+T” in table 1. Trim values are

automatically read from EEPROM in the beginning

of each conversion when this feature is enabled in

the trimming control register (EE/6EHEX). When

disabled it is possible to test different trim data in the

trim registers before final trimming values are found

and stored in the EEPROM.

Reset register (E0/60HEX) does not contain any data.

Any dummy data written to this register forces a

reset.

reset

initializes

all

control

registers

(addresses E1HEX

…EEHEX) to a zero value.

Test register (E1/61HEX) is mainly used for testing

and trimming purposes. See table 2 in chapter TEST

test register is needed for selecting the external

clock signal.

The Measurement control register (E2/62HEX) is used

for configuring and starting an A/D conversion.

The CS_INT (E3/63HEX) and the CR_INT (E4/64HEX)

capacitor matrix registers select internal capacitors

which are connected from CC pin to the CS and to

the CR pins respectively. Both matrix capacitor

values can be chosen independently between 0pF

and 22pF in 86.3fF steps.

The Gain register (E5/65HEX) controls the gain of the

CDC front-end. Gain value together with the CS_INT

and CR_INT values determine input capacitance

conversion range.

The Oscillator frequency control register (E6/66HEX)

is used only during internal clock oscillator trimming.

During trimming there is searched register value

which gives closest to the nominal 200 kHz oscillator

frequency. However the internal clock oscillator

frequency is trimmed by MAS during wafer level

testing and the trimming value is stored into the

Oscillator frequency trim data EEPROM address

(C6/46HEX). Thus there is no need to adjust the

factory stored clock oscillator trimming value. In

normal operation the trim value is automatically read

from the EEPROM memory in the beginning of each

conversion.

EEPROM write enable register (E9/69HEX) is used for

enabling EEPROM write since by default the

EEPROM is write protected.

The 24-bit A/D conversion result (capacitance or

temperature) is stored into three registers EAHEX

(MSB,

most

significant

byte),

EBHEX

(ISB,

intermediate significant byte), ECHEX (LSB, least

significant byte).

The EEPROM status register (ED/6DHEX) reflects the

EEPROM error correction status. This register can

be used to verify that the EEPROM operation has

finished without errors.

The Trimming control register (EE/6EHEX) defines

whether the trim data in the EEPROM or in the

registers are used during operation. The default

setting is that all trim data is automatically read from

the EEPROM memory in the beginning of each

conversion. See the Trimming control register

description for details.

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