AT24C16B(2006) データシートの表示（PDF） - Atmel Corporation

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AT24C16B
(Rev.:2006)

Two-wire Serial EEPROM

Atmel Corporation 

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 4 on

page 7). 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 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 Fig-

ure 5 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 AT24C16B 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.

SOFTWARE RESET: After an interruption in protocol, power loss or system reset, any 2-wire

part can be protocol reset by following these steps:

1. Clock up to 9 cycles.

2. Look for SDA high in each cycle while SCL is high.

3. Create a start condition.

6 AT24C16B Preliminary

5175A–SEEPR–09/06

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