ACE24AC02A3

Two-wire Serial EEPROM

VER 1.3

4

Device Operation

A.

Serial Clock And Data Transitions

The SDA pin is typically pulled to high by an external resistor. Data is allowed to change only when

Serial clock SCL is at VIL. Any SDA signal transition may interpret as either a start or stop condition

as described below.

B.

Start Conditions

With SCL ≥ V

commands must begin with a start condition.

C.

Stop Condition

With SCL ≥ V

write commands end with a stop condition. The device goes into the standby mode if it is after a read

command. A stop condition after page or byte write command will trigger the chip into the standby

mode after the self-timed internal programming finish.

D.

Acknowledge

The 2-wire protocol transmits address and data to and from the EEPROM in 8 bit words. The

EEPROM acknowledge the data or address by outputting a "0" after receiving each word. The

acknowledge signal occurs on the 9th serial clock after each word.

E.

Standby Mode

The EEPROM goes into low power standby mode after a fresh power up, after receiving a stop bit in

read mode, or after completing a self-time internal programming operation.

Figure 3: Timing diagram for start and stop conditions

Figure 4: Timing diagram for output acknowledge