3

5192C–SEEPR–01/09

AT24HC02B/04B

The AT24HC04B uses the A2 and A1 inputs for hardware addressing, and a total of four 4K

devices may be addressed on a single bus system. The A0 pin is a no-connect.

WRITE PROTECT (WP): The AT24HC02B/04B have 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

enabled and operates as shown in the following table.

Table 3-1.

Write Protect

WP Pin

Status

Part of the Array Protected

AT24HC02B/04B

At V

CC

Upper Half (1K/2K) Array

At GND

Normal Read/Write Operations