m24lr16e-r STMicroelectronics, m24lr16e-r Datasheet - Page 30

• Manufacturer Part Number: m24lr16e-r
• Description: 16 Kbit Eeprom With Password Protection, Dual Interface & Energy Harvesting 400 Khz I²c Bus & Iso 15693 Rf Protocol At 13.56 Mhz
• Manufacturer: STMicroelectronics

System memory area
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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:
●
The ReadCfg command is used to read the eight bits of the Configuration byte.
●
The WriteEHCfg command is used to write the EH_mode, EH_cfg1 and EH_cfg0 bits into
the Configuration byte.
●
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:
●
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.
●
The SetRstEHEn command is used to set or reset the value of the EH_enable bit into the
Control register.
ISO 15693 system parameters
The M24LR16E-R provides the system area required by the ISO 15693 RF protocol, as
shown in
The first 32-bit block starting from I
is used to activate/deactivate the write protection of the protected sector in I
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 I
password described in
all the presented bits correspond to the stored ones — it is also possible to modify the I
password using the I2C write password command described in
The next three 32-bit blocks store the three RF passwords. These passwords are neither
read- nor write- accessible in the I
Read configuration byte command (ReadCfg):
Write energy harvesting configuration command (WriteEHCfg):
Write RF WIP/BUSY pin configuration command (WriteDOCfg):
Check energy harvesting enable bit command (CheckEHEn):
Set/reset energy harvesting enable bit command (SetRstEHEn):
Table
17.
Figure
Doc ID 018932 Rev 7
12. When the password is correctly presented — that is, when
2
2
C mode.
C address 2304 stores the I
2
Figure
C password. This password
13.
2
C mode. At
2
C present
M24LR16E
2
C