X24165 데이터 시트보기 (PDF) - IC MICROSYSTEMS

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X24165

Advanced 2-Wire Serial E2PROM with Block Lock™ Protection

IC MICROSYSTEMS 

X24165

DEVICE OPERATION

The X24165 supports a bidirectional bus oriented pro-

tocol. The protocol defines any device that sends data

onto the bus as a transmitter, and the receiving device as

the receiver. The device controlling the transfer is a

master and the device being controlled is the slave. The

master will always initiate data transfers, and provide

the clock for both transmit and receive operations.

Therefore, the X24165 will be considered a slave in all

applications.

Clock and Data Conventions

Data states on the SDA line can change only during

SCL LOW. SDA state changes during SCL HIGH are

reserved for indicating start and stop conditions. Refer to

Figures 1 and 2.

Start Condition

All command are preceded by the start condition, which

is a HIGH to LOW transition of SDA when SCL is

HIGH. The X24165 continuously monitors the SDA and SCL

lines for the start condition and will not respond to

any command until this condition has been met.

Figure 1. Data Validity

SCL

SDA

DATA STABLE DATA

CHANGE

6551 ILL F04

Notes: (5) Typical values are for TA = 25°C and nominal supply voltage (5V)

(6) tWR is the minimum cycle time from the system perspective when polling techniques are not used. It is the maximum

the device requires to perform the internal write operation.

Figure 2. Definition of Start and Stop

SCL

SDA

START BIT

STOP BIT

6551 ILL F05

3

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