DA6505.005
11 June 2018
EEPROM WRITE PROCEDURE
This chapter gives instructions for writing data to the
EEPROM memory.
triggers power-on-reset (POR) but to make sure the
device is reset it is recommended to give an
additional reset by writing any data byte on the reset
register (EC/6CHEX) via the serial bus.
The 512-bit (64 byte) EEPROM memory is available
for storing trimming and calibration data on chip. The
first 464-bits (58 bytes) in addresses 80/00HEX
…
The EEPROM is activated and write enabled by
writing value 0AHEX to the EEPROM control register
(ED/6DHEX). After activating EEPROM there need to
be a wait of at least 0.2 ms before reading from or
writing to EEPROM.
B9/39HEX are free for any use such as storing sensor
calibration coefficients. The last six EEPROM bytes
in addresses BA/3AHEX … BF/3FHEX are reserved for
trimming purposes. See table 1 describing register
and EEPROM data addresses.
Next the data can be written to the EEPROM
memory addresses one byte (8-bit) at a time. It is
necessary to have a delay of minimum 13ms after
programming each byte (8-bit). The success of each
write can be verified by reading back the data byte
(8-bit) and comparing it to the original byte (8-bit).
Writing to the non-volatile EEPROM memory
requires supply voltage of 5.0V (VDD=4.5V…5.5V).
See write/read application figure 4 below. However
note that the EEPROM read is possible at wide
supply voltage range VDD=1.71V…5.5V.
The EEPROM write procedure is shown on the next
page figure 5.
After all data bytes are written the EEPROM memory
is inactivated and protected from write by writing
00HEX to the EEPROM control register (ED/6DHEX).
In the beginning of the EEPROM write procedure the
initial conditions need to be reset. Connecting VDD
OPTIONAL TEMPERATURE
SENSING DIODE
+5V
VDDIO
CVDDIO
100nF
CVDD
10µF
VDDIO
VDD
RP
4.7k
TD
VDD
VDDIO
OSC
EEPROM
VDDS
PI
RP
4.7k
REG
VREFP
GND
AFE
P
T
SENSOR
SDI
I/O
SDO
ADC
CONTROL
P
NI
I2C/
SPI
SCK
CSB
I/O
T
VDDS
GNDS
VREFN
R3
R1
TEST
MUX
SDO
R4
R2
MCU
T
P
T
MAS6505
GND
GND
GND
GND
NOTE: In I2C bus communication the CSB pin is unused and left unconnected (floating). It has an internal pull up to VDDIO.
Figure 4. Typical EEPROM write/read application circuit (VDD=+5V) in I2C bus communication
27 (44)
MAS [ MICRO ANALOG SYSTEMS ]
