SCL is a serial clock: the serial clock input contact is used to generate the clock signal of data transmission or reception of the whole equipment.<br>SDL is a serial data / address: a two-way serial data port / address is used to send or receive all data of the device.<br>A0, A1, A2 are input terminals of equipment address: with 24C02, up to 8 devices can be generated. If the bus address has only one 24C02, the three input contacts A0, A1, A2 can remain floating or connected to VSS.<br>WP is write proof: if WP output is connected to VCC, all content is write proof and only readable. When the WP output is connected to VSS or floating away, the device can perform normal read / write operations. As shown in Figure 4, contact diagram<br>
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