M24256-WMW6 STMicroelectronics, M24256-WMW6 Datasheet - Page 21

• Manufacturer Part Number: M24256-WMW6
• Description: IC EEPROM 256KBIT 400KHZ 8SOIC
• Manufacturer: STMicroelectronics

Specifications of M24256-WMW6

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 256K (32K x 8)
• Speed: 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

M24256-BF, M24256-BR, M24256-BW, M24256-DR
3.18
3.19
Reading the lock status (M24256-D only)
The locked/unlocked status of the Identification page can be checked by transmitting a
specific truncated command [Identification Page Write instruction + one data byte] to the
device. The device will return an acknowledge bit if the Identification page is unlocked,
otherwise a NoAck bit if the Identification page is locked.
Right after this, it is recommended to transmit to the device a Start condition followed by a
Stop condition, so that:
●
●
Acknowledge in Read mode
For all Read instructions, the device waits, after each byte read, for an acknowledgment
during the 9
time, the device terminates the data transfer and switches to its Standby mode.
Start: the truncated command is not executed because the Start condition resets the
device internal logic,
Stop: the device is then set back into Standby mode by the Stop condition.
th
bit time. If the bus master does not drive Serial Data (SDA) Low during this
Doc ID 6757 Rev 23
Device operation
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