AT24C02C-WWUUM 查看數據表（PDF） - Atmel Corporation

零件编号

产品描述 (功能)

生产厂家

AT24C02C-WWUUM

Two-wire Serial Electrically Erasable and Programmable Read-only Memory

Atmel Corporation 

3. Device Operation

CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an external device. Data on the SDA

pin may change only during SCL low time periods (see Figure 5-2 on page 8). Data changes during SCL high

periods will indicate a start or stop condition as defined below.

START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which must precede any

other command (see Figure 5-3 on page 8).

STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition. After a read sequence, the

stop command will place the EEPROM in a standby power mode (see Figure 5-3 on page 8).

ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words.

The EEPROM sends a zero to acknowledge that it has received each word. This happens during the ninth clock

cycle.

STANDBY MODE: The Atmel® AT24C02C features a low-power standby mode which is enabled: (a) upon power-

up and (b) after the receipt of the STOP bit and the completion of any internal operations.

2-Wire Software Reset: After an interruption in protocol, power loss or system reset, any 2-wire part can be reset

by following these steps: (a) Create a start bit condition, (b) clock 9 cycles, (c) create another start bit followed by

stop bit condition as shown below. The device is ready for next communication after above steps have been

completed.

Figure 3-1. Software reset

Start bit

Dummy Clock Cycles

Start bit

Stop bit

SCL

1

2

3

8

9

SDA

6 Atmel AT24C02C

8700D–SEEPR–8/10

Share Link: