3.

Description

The AT24CS32 provides 32,768 bits of Serial Electrically Erasable and Programmable Read-Only Memory

(EEPROM) organized as 4,096 words of 8 bits each. The device’s cascading feature allows up to eight devices to

share a common two‑wire bus. The device is optimized for use in many industrial and commercial applications where

low‑power and low‑voltage operation are essential. The devices are available in space‑saving 8‑lead SOIC, 8‑lead

TSSOP, 8‑pad UDFN and 5-lead SOT23 packages. All packages operate from 1.7V to 5.5V.

The AT24CS32 provides the additional feature of a factory programmed, ensured unique 128-bit serial number, while

maintaining all of the traditional features available in the 32‑Kbit Serial EEPROM. The time consuming step of

performing and ensuring true serialization of product on a manufacturing line can be removed from the production

flow by employing the CS Series Serial EEPROM. The 128-bit serial number is programmed and permanently locked

from future writing during the Microchip production process. Further, this 128-bit location does not consume any of

the user read/write area of the 32‑Kbit Serial EEPROM. The uniqueness of the serial number is ensured across the

entire CS Series of Serial EEPROMs, regardless of the size of the memory array or the type of interface protocol.

This means that as an application’s needs for memory size or interface protocol evolve in future generations, any

previously deployed serial number from any Microchip CS Series Serial EEPROM part will remain valid.

3.1

System Configuration Using Two-Wire Serial EEPROMs

I2C Bus Master:

Microcontroller

Slave 0

AT24CSXX

VCC

WP

SDA

SCL

A0

A1

A2

GND

VCC

GND

SCL

SDA

WP

RPUP(max) = tR(max)

0.8473 x CL

RPUP(min) = VCC - VOL(max)

IOL

Slave 1

AT24CSXX

VCC

WP

SDA

SCL

A0

A1

A2

GND

Slave 7

AT24CSXX

VCC

WP

SDA

SCL

A0

A1

A2

GND

VCC

AT24CS32

Description

© 2020 Microchip Technology Inc.

Datasheet

DS20006341A-page 7