m24lr16e-r STMicroelectronics, m24lr16e-r Datasheet - Page 41

• 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

M24LR16E
5.16.2
Figure 13. I
I
The I
password system area. This command is used in I
value. It cannot be used to update any of the RF passwords. After the write cycle, the new
I
after issuing a valid I
On delivery, the I
Following a Start condition, the bus master sends a device select code with the Read/Write
bit (RW) reset to 0 and the Chip Enable bit E2 at 1. The device acknowledges this, as shown
in
responds to each address byte with an acknowledge bit, and then waits for the four
password data bytes, the validation code, 07h, and a resend of the four password data
bytes. The most significant byte of the password is sent first, followed by the least significant
bytes.
It is necessary to send twice the 32-bit password to prevent any data corruption during the
write sequence. If the two 32-bit passwords sent are not exactly the same, the M24LR16E-R
does not modify the I
When the bus master generates a Stop condition immediately after the Ack bit (during the
tenth bit time slot), the internal write cycle is triggered. A Stop condition at any other time
does not trigger the internal write cycle.
During the internal write cycle, the serial data (SDA) signal is disabled internally, and the
device does not respond to any requests.
2
2
2
C password value is automatically activated. The I
C write password command
C write password command description
Figure
2
C write password command is used to write a 32-bit block into the M24LR16E-R I
13, and waits for the two I
2
C default password value is set to 0000 0000h and is activated.
2
2
C present password command.
C password value.
Doc ID 018932 Rev 7
2
C password address bytes, 09h and 00h. The device
2
C mode to update the I
2
C password value can only be modified
I
2
C device operation
2
C password
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2
C