Data Sheet

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Copyright LZE GmbH 2021
Additional Features
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7.3 EEPROM Access Restriction (Lock Modes)
The lock mode definition at EEPROM address 0x020 can be used to prevent write and read access to the
EEPROM. After setting single bits in the lock mode word and performing a reset cycle the bits can not be
set back to 0. The following table gives an overview about the locked EEPROM functions and address
ranges.
It is strongly recommended to set the lock mode as soon as possible to the highest possible value to
prevent unintended EEPROM access. Only in rare cases it might be necessary to modify the calibration
values or the measurement sequence definitions.
Bit
Lock address
ranges
Default
Value
Recom-
mended
Value
Description
D15 (MSB)
-
1
1
Reserved
D14
0x010 –
0x01F
0x030 –
0x057
0x080 –
0x0FF
0
1
Sensor calibration data
D13
-
0
0
Reserved
D12
SPI register
0x001, bit 0
0
1
Manual measurements can not be started
if this lock bit is set.
D11
-
0
*
Selection bit for PWM mode. 0: off,
1: PWM output can be activated (see
7.4).
D10
-
1
1
Reserved
D9
-
1
1
Reserved
D8
-
0
1
Read protection for sensor calibration
data
D7
0x05F –
0x07F
0
*
Linearization table. After modifying the
table to the final values this lock bit
should be set, too.
D6
0x100 –
0x1FF
0
1
Measurement sequence definitions, part
A
D5
0x100 –
0x1FF
0
1
Measurement sequence definitions, part
B
D4
0x000 –
0x00F
0
1
SPI register initialization
D3
0x009
0
0
Reserved
D2
SPI registers
0x000 –
0x009
0x00B –
0x027
0
1
Direct access to volatile SPI registers
Lock mode bits