24AA014-ISLASHMS datasheet(4/24 Pages) MICROCHIP

4 / 24 page

24AA014/24LC014

DS21809C-page 4

2.0

PIN DESCRIPTIONS

2.1

SDA Serial Data

This is a bidirectional pin used to transfer addresses

and data into and out of the device. It is an open drain

terminal. Therefore, the SDA bus requires a pull-up

resistor to VCC (typical 10 k

Ω for 100 kHz, 2 kΩ for

400 kHz).

For normal data transfer SDA is allowed to change only

during SCL low. Changes during SCL high are

reserved for indicating the Start and Stop conditions.

2.2

SCL Serial Clock

The SCL input is used to synchronize the data transfer

to and from the device.

2.3

A0, A1, A2

The levels on the inputs A0, A1 and A2 are compared

with the corresponding bits in the slave address. The

chip is selected if the compare is true.

Up to eight 24AA014/24LC014 devices may be

connected to the same bus by using different Chip

Select bit combinations. These inputs must be

connected to either VCC or VSS.

2.4

WP is the hardware write-protect pin. It must be tied to

VCC or VSS. If tied to VCC, the hardware write protection

is enabled. If the WP pin is tied to VSS the hardware

write protection is disabled.

2.5

Noise Protection

The 24AA014/24LC014 employs a VCC threshold

detector circuit that disables the internal erase/write

logic if the VCC is below 1.5 volts at nominal conditions.

The SCL and SDA inputs have Schmitt Trigger and

filter circuits that suppress noise spikes to assure

proper device operation even on a noisy bus.

3.0

FUNCTIONAL DESCRIPTION

The 24AA014/24LC014 supports a bidirectional, 2-wire

bus and data transmission protocol. A device that

sends data onto the bus is defined as transmitter, and

a device receiving data as receiver. The bus has to be

controlled by a master device that generates the Serial

Clock (SCL), controls the bus access and generates

the Start and Stop conditions while the 24AA014/

24LC014 works as slave. Both master and slave can

operate as transmitter or receiver, but the master

device determines which mode is activated.

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