3.5.2 function introduction to AT24C02
1. Description
The AT24C02 (U202) provides 2048 bits of serial electrically erasable and programmable read-only
memory (EEPROM) organized as 256 words of 8 bits each. The device is optimized for use in many industrial
and commercial applications where low-power and low-voltage operation are essential. The AT24C02 is
available in space-saving 8-lead PDIP,
8-lead MAP, 8 lead TSSOP and 8-ball dBGA2 packages and is accessed via a 2-wire serial interface. In
addition, the entire family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 5.5V) versions
2. Features
◆ Low-voltage and Standard-voltage Operation
– 2.7 (VCC = 2.7V to 5.5V)
– 1.8 (VCC = 1.8V to 5.5V)
◆ Internally Organized, 256 x 8 (2K),
◆ 2-wire Serial Interface
◆ Schmitt Trigger, Filtered Inputs for Noise Suppression
◆ Bi-directional Data Transfer Protocol
◆ 100 kHz (1.8V) and 400 kHz (2.5V, 2.7V, 5V) Compatibility
◆ Write Protect Pin for Hardware Data Protection
◆ 8-byte Page (1K, 2K), Write Modes
◆ Partial Page Writes are Allowed
◆ Self-timed Write Cycle (5 ms max)
◆ High-reliability
◆ – Endurance: 1 Million Write Cycles
◆ – Data Retention: 100 Years
◆ Automotive Grade, Extended Temperature and Lead-Free Devices Available
◆ 8-lead PDIP, 8-lead JEDEC SOIC, 8-lead MAP, 5-lead SOT23,
◆ 8-lead TSSOP and 8-ball dBGA2™ Packages
3. PIN Description
PIN No. Symbol I/O Description
1 A0 I To Ground
2 A1 I To Ground
3 A2 I To Ground
4 VSS I To Ground
5 SDA I/O Serial Data input
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