AT24C08C-STUM-T Datasheet, PDF (4/24 Pages) ATMEL Corporation – I2C-Compatible, (2-wire) Serial EEPROM 4-Kbit (512 x 8), 8-Kbit (1024 x 8)

3. Pin Description
Serial Clock (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge
clock data out of each device.
Serial Data (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open-drain driven and may be
wire-ORed with any number of other open-drain or open-collector devices.
Device/Page Addresses (A₂ and A₁): The AT24C04C uses the A₂ and A₁ inputs for hard wire addressing allowing a
total of four 4K devices to be addressed on a single bus system. Pin 1 is a no connect and can be connected to ground
(see Section 6. “Device Addressing” on page 10). The AT24C08C only uses the A₂ input for hardware addressing and a
total of two 8K devices may be addressed on a single bus system. The A₀ and A₁ pins are no connects and can be
connected to ground (see Section 6. “Device Addressing” on page 10).
Write Protect (WP): AT24C04C/08C has a Write Protect pin that provides hardware data protection. The Write Protect
pin allows normal read/write operations when connected to Ground (GND). When the Write Protect pin is connected to
V_CC, the write protection feature is enabled and operates as shown in Table 3-1.
Table 3-1. Write Protect
WP Pin
Status
At V_CC
At GND
Part of the Array Protected
Atmel AT24C04C/08C
Full array
Normal read/write operations
Atmel AT24C04C/08C [DATASHEET]
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