Note 13: The minimum SCL clock frequency is limited by the bus timeout feature. If the CM bit is 1

and SCL stays at the same logic

level or SDA stays low for this interval, the DS28CN01 behaves as though it has sensed a STOP condition.

Note 14: System requirement.

bridge the undefined region of the falling edge of SCL.

Note 16: The master can provide a hold time of 0ns minimum when writing to the device. This 0ns minimum is guaranteed by

design, characterization, and/or simulation only, and not production tested.

≥ 250ns must

then be met. This is automatically the case if the device does not stretch the low period of the SCL signal. If such a device

4

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ABRIDGED DATA SHEET

Pin Description

PIN

NAME

FUNCTION

1

AD0

Device Address Input Pin to Select the Slave Address. Sets slave address bits A[1:0] and must be

2

AD1

Device Address Input Pin to Select the Slave Address. Sets slave address bits A[3:2] and must be

3, 7

N.C.

No Connection

4

GND

Ground Supply

5

SDA

6

SCL

8

Power-Supply Input

Detailed Description

1Kb of SHA-1 secure EEPROM, a register page, and a

unique registration number, as shown in the

Block

Diagram. The device communicates with a host proces-

mode to SMBus mode. Two 4-level address pins allow

16 DS28CN01s to reside on the same bus segment.

Device Operation

Read and write access to the DS28CN01 is controlled

DS28CN01 has memory areas and registers of different

characteristics, there are several special cases to con-

sider. See the

Read and Write section in the full data

sheet for details.

Serial Communication Interface

The serial interface uses a data line (SDA) plus a clock

signal (SCL) for communication. Both SDA and SCL are

bidirectional lines, connected to a positive supply volt-

age through a pullup resistor. When there is no commu-

nication, both lines are high. The output stages of

devices connected to the bus must have an open-drain

or open-collector output to perform the wired-AND

function. Data can be transferred at rates of up to

100kbps in the standard mode, and up to 400kbps in

the fast mode. The DS28CN01 works in both modes.

A device that sends data on the bus is defined as a

transmitter and a device receiving data is a receiver.

The device that controls the communication is called a

master. The devices that are controlled by the master

are slaves. The DS28CN01 is a slave device.

ELECTRICAL CHARACTERISTICS (continued)