MAS6505 datasheet(29/44 Pages) MAS

29 / 44 page

DA6505.005

11 June 2018

29 (44)

EEPROM READ ONLY PROCEDURE

This chapter gives instructions for only reading data

from the EEPROM memory.

In read only application (using readily programmed

MAS6505 sensor module) the EEPROM can be read

at wide supply voltage range VDD=1.71V…5.5V.

In the beginning of the EEPROM read only

procedure the initial conditions are reset. Connecting

VDD triggers power-on-reset (POR) but to make

sure the device is reset an additional reset should be

given by writing any data byte to the reset register

(EC/6CHEX) via the serial bus.

The EEPROM is activated and kept write protected

by writing value 02HEX (or alternatively 05HEX) to the

EEPROM

control

(ED/6DHEX).

After

activating EEPROM there need to be wait at least

0.2 ms before reading from or writing to EEPROM.

In read there is no need for extra delay between

reads of each byte like in write and incremental read

can be used (after each read byte the read address

is automatically incremented to a next address if

read is continued).

After all data bytes are read the EEPROM memory

is inactivated by writing 00HEX to the EEPROM

control register (ED/6DHEX).

Figure 6. Flow chart for MAS6505 EEPROM read only

START

INITIAL CONDITIONS

Reset device by writing any data to the reset register EC/6CHEX

POWER UP DEVICE

Connect supply voltage 1.71V…5.5V to VDD pin

ACTIVATE EEPROM FOR A READ ONLY

Write 02HEX to the EEPROM control register ED/6DHEX

STOP

INACTIVATE EEPROM

Write 00HEX to the EEPROM control register ED/6DHEX

READ DATA FROM EEPROM

Read data byte (8-bit) to selected EEPROM memory address

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