24CSM01 datasheet(2/63 Pages) MICROCHIP

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24CSM01

DS20006781B

-page 2

Preliminary

 2023 Microchip Technology Inc. and its subsidiaries

Description

The Microchip Technology Inc. 24CSM01 provides

1 Mbit of Serial EEPROM, utilizing an I2C (Two-Wire)

serial interface with 3.4 MHz High-Speed mode

capability. The device is organized as 131,072 bytes of

8 bits each (128 Kbytes) and is optimized for use in

consumer and industrial applications where reliable

and dependable nonvolatile memory storage is

essential. The 24CSM01 allows up to eight devices to

share a common I2C (Two-Wire) bus and is capable of

operation across a broad voltage range (1.7V to 5.5V).

The 24CSM01 features a 4-Kbit Security register,

separate from the 1-Mbit memory array. The first half of

the Security register is read-only and contains a

factory-programmed, ensured unique, 128-bit serial

number in the first 16 bytes. The 128-bit serial number is

unique across the entire CS series of Serial EEPROM

products and eliminates the time-consuming step of

performing and ensuring serialization of a product on a

manufacturing line. The 128-bit read-only serial number

is followed by an additional 2 Kbit (256 bytes) of

user-programmable EEPROM. The user-programmable

section of the Security register can later be permanently

write-protected via a software sequence.

The device also contains a Configuration register,

which allows the write protection behavior to be

configured for legacy hardware write protection or

enhanced software write protection. This allows the

user to protect any of the eight independent 128-Kbit

zones. Once the desired configuration is set, the

Configuration register can be permanently locked,

thereby preventing any further changes to the device

operation.

For added reliability, the 24CSM01 utilizes a built-in

Error Correction Code (ECC) scheme. This scheme

can correct up to one incorrectly read bit within a

four-byte readout. Additionally, the Configuration

latch (ECS) that is set when ECC is invoked.

The 24CSM01 supports the I2C Manufacturer

Identification (ID) command, which will return a unique

value for the 24CSM01, allowing easy identification

within the application.

System Configuration Using Serial EEPROMs

I2C MCU

Client 0

24CSXXX

RPUP(max) =

tR(max)

0.8473

 CL

RPUP(min) =

VCC – VOL(max)

IOL

VCC

VSS

VCC

SCL

SDA

VSS

VCC

SDA

SCL

Client 1

24CSXXX

VSS

VCC

SDA

SCL

Client 3

24CSXXX

VSS

VCC

SDA

SCL

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