M24LR16E-R Datasheet, PDF (30/143 Pages) STMicroelectronics – 16-bit EEPROM with password protection, dual interface & energy harvesting: 400 kHz I²C bus & ISO 15693 RF protocol at 13.56 MHz

System memory area
M24LR16E-R
4.3.4
4.3.5
Configuration byte access in I²C and RF modes
In I²C mode, read and write accesses to the non-volatile Configuration byte are always
allowed. To access the Configuration byte, the device select code used for any I²C
command must have the E2 Chip enable address at 1.
The dedicated commands to access the Configuration byte in RF mode are:
● Read configuration byte command (ReadCfg):
The ReadCfg command is used to read the eight bits of the Configuration byte.
● Write energy harvesting configuration command (WriteEHCfg):
The WriteEHCfg command is used to write the EH_mode, EH_cfg1 and EH_cfg0 bits into
the Configuration byte.
● Write RF WIP/BUSY pin configuration command (WriteDOCfg):
The WriteDOCfg command is used to write the RF WIP/BUSY bit into the Configuration
byte.
After any write access to the Configuration byte, the new configuration is automatically
applied.
Control register access in I²C or RF mode
In I²C mode, read and write accesses to the volatile Control register are always allowed. To
access the Control register, the device select code used for any I²C command must have the
E2 Chip enable address at 1.
The dedicated commands to access the Control register in RF mode are:
● Check energy harvesting enable bit command (CheckEHEn):
The CheckEHEn command is used to read the eight bits of the Control register. When it is
run, the FIELD_ON bit is always read at 1.
● Set/reset energy harvesting enable bit command (SetRstEHEn):
The SetRstEHEn command is used to set or reset the value of the EH_enable bit into the
Control register.
4.4
ISO 15693 system parameters
The M24LR16E-R provides the system area required by the ISO 15693 RF protocol, as
shown in Table 17.
The first 32-bit block starting from I²C address 2304 stores the I²C password. This password
is used to activate/deactivate the write protection of the protected sector in I²C mode. At
power-on, all user memory sectors protected by the I2C_Write_Lock bits can be read but
cannot be modified. To remove the write protection, it is necessary to use the I²C present
password described in Figure 12. When the password is correctly presented — that is, when
all the presented bits correspond to the stored ones — it is also possible to modify the I²C
password using the I2C write password command described in Figure 13.
The next three 32-bit blocks store the three RF passwords. These passwords are neither
read- nor write- accessible in the I²C mode.
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Doc ID 018932 Rev 8