MAS6512 datasheet(17/32 Pages) MAS

17 / 32 page

DA6512.003

2 December, 2016

17 (32)

EEPROM WRITE PROCEDURE

This chapter gives instructions for writing data to the

EEPROM memory.

The

MAS6512

bit

Capacitance-to-Digital

Converter (CDC) has a 256 bit (32 bytes) EEPROM

memory. 8 bits (1 byte) has been reserved for

storing internal clock oscillator trimming data and

other 8 bits (1 byte) for the programmable I2C

device address. There are also 24 bits (3 bytes) for

trimming the capacitive sensor front-end. The

remaining 216 bits (27 bytes) are free for storing

sensor calibration data and other use.

See figure 3 on previous page showing the

EEPROM write procedure.

Make sure in the beginning of the EEPROM write

procedure that the MAS6512 initial conditions are

met. 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 register E0/60HEX via

the serial bus. The device reset will guarantee that

SOSC=0 is selected in the test register (E1/61HEX).

This selects 200 kHz clock which is required in the

EEPROM programming.

EEPROM write is enabled by writing value 04HEX to

the EEPROM write enable register (E9/69HEX). The

default register value after power on is 00HEX.

Next the data can be written to the EEPROM

memory one byte (8-bit) at a time. It is necessary to

have a delay of minimum 16ms after programming

each byte (8-bit). The success of each write can be

verified by reading back the data (8-bit) and

comparing it to the original byte (8-bit). Additionally

it is also possible to check the EEPROM status

EEPROM status register value should be 00HEX

when the read EEPROM data byte is free of errors.

After all data bytes are written the EEPROM

memory can be protected from write by writing

00HEX to the EEPROM write enable register

(E9/69HEX).

See table 1 showing the MAS6512 register and

EEPROM data addresses.

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