7.1 Byte Write

The AT24C01C/AT24C02C/AT24C04C/AT24C08C supports the writing of a single 8-bit byte. Selecting a data word in the AT24C01C and AT24C02C requires a 7‑bit or 8‑bit word address, while selecting a data word in the AT24C04C and AT24C08C requires a 9‑bit or 10‑bit word address.

Upon receipt of the proper device address and the word address bytes, the EEPROM will send an Acknowledge. The device will then be ready to receive the 8‑bit data word. Following receipt of the 8‑bit data word, the EEPROM will respond with an ACK. The addressing device, such as a bus host, must then terminate the write operation with a Stop condition. At that time, the EEPROM will enter an internally self‑timed write cycle, which will be completed within tWR while the data word is being programmed into the nonvolatile EEPROM. All inputs are disabled during this write cycle, and the EEPROM will not respond until the write is complete.

Figure 7-1. Byte Write
Note:
  1. For the AT24C01C, AT24C02C and AT24C04C, the @ indicates the A1 hardware client address bit. For the AT24C08C, the @ indicates the A9 word address bit.
  2. For the AT24C01C and AT24C02C, the $ indicates the A0 hardware client address bit. For the AT24C04C and AT24C08C, the $ indicates the A8 word address bit.
  3. For the AT24C01C, the % indicates a “don’t care” bit. For the AT24C02C, AT24C04C and AT24C08C, the % indicates the A7 word address bit.