MAS6512 datasheet(10/32 Pages) MAS

10 / 32 page

DA6512.003

2 December, 2016

10 (32)

MAS6512 includes a 32 bytes (256 bits) EEPROM

data memory and thirteen 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 11 in chapter SERIAL DATA INTERFACE

CONTROL. The MAS6512 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

MAS6512. When unique device address is needed

it can be programmed to the Programmable I2C

Device Address register (C2HEX). The MAS6512 will

respond to both hard wired and programmed I2C

device addresses.

MAS6512 has four trim registers: CS capacitor

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

Oscillator frequency 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 (ED/6DHEX). 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. A 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 REGISTER. If an external clock signal is

used the 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 (E3/63HEX) and the CR (E4/64HEX) capacitor

matrix registers select internal capacitors which are

connected from the CS and the CR pins

respectively to the CC pin. Both capacitor values

can be chosen independently between 0pF and

22pF in 86fF steps.

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

CDC front-end. Together with the CS and CR

values the gain determines the 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 16-bit A/D conversion result (capacitance,

temperature or monitored supply voltage) is stored

into two registers EAHEX (MSB, most significant

byte) and EBHEX (LSB, least significant byte).

The EEPROM status register (EC/6CHEX) 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 (ED/6DHEX) 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.

MAS6512 数据表(PDF) 10 Page - Micro Analog systems

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MAS6512 数据表(PDF) 10 Page - Micro Analog systems

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