24CSM01 datasheet(8/63 Pages) MICROCHIP

8 / 63 page

24CSM01

DS20006781B

-page 8

Preliminary

 2023 Microchip Technology Inc. and its subsidiaries

2.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

2.1

Device Address Inputs (A1 and

A2)

The A1 and A2 inputs are used by the 24CSM01 for

multiple device operations. The logic levels on these

inputs are compared with the corresponding bits in the

client address. The chip is selected if the compare is true.

Up to four devices may be connected to the same bus

by using different hardware client address bit

combinations. These inputs must be connected to

either VCC or VSS.

In most applications, the device address inputs, A1 and

A2, are hardwired to logic ‘0’ or logic ‘1’. For

applications in which these pins are controlled by a

microcontroller or another programmable logic device,

the device address pins must be driven to a logic ‘0’ or

a logic ‘1’ before normal device operation can proceed.

2.2

Serial Data (SDA)

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 (typically 10 kΩ for 100 kHz, 2 kΩ for

400 kHz and 1 MHz and 330Ω for 3.4 MHz).

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.

2.3

Serial Clock (SCL)

This input is used to synchronize the data transfer to

and from the device.

2.4

Write-Protect (WP)

This pin must be connected to either VSS or VCC. If tied

to VSS, write operations to the memory array and

Security register are enabled. If tied to VCC, write

operations to the memory array and Security register are

inhibited, but read operations are not affected.

TABLE 2-1:

PIN FUNCTION TABLE

Name

8-Ball

CSP

8-Lead

MSOP

8-Lead

PDIP

8-Lead

SOIC

8-Lead

SOIJ

8-Lead

TSSOP

8-Lead

UDFN(1)

Function

111

No Connect

Device Address Input

VSS

444

Ground

SDA

555

Serial Data

SCL

666

Serial Clock

777

Write-Protect

VCC

888

Device Power Supply

Note 1: The exposed pad on this package can be connected to VSS or left floating.

Note:

This pin is ignored when using Enhanced

Software Write Protection mode and

should be tied to either VCC or VSS.

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