24CSM01-ESLASHP datasheet(30/63 Pages) MICROCHIP

30 / 63 page

24CSM01

DS20006781B

-page 30

Preliminary

 2023 Microchip Technology Inc. and its subsidiaries

10.1

Custom Programming Option

The 24CSM01 supports the preprogramming and

subsequent locking of customer-specific data in the

user-programmable portion of the Security register.

Contact your local sales representative for support for

custom programming options.

10.2

Read Operations in the Security

Random read and sequential read operations of the

Security register require that the device type be set to

‘1011b’ (Bh). It is also necessary to match the

hardware client address bits (A2 and A1) to their

corresponding device address input pins. The next

word address bit, A16, needs to be clocked in, which

for the Security register is a “don't care” followed by a

logic ‘0’ to the Read/Write Select (R/W) bit. Following

the device address byte, the word address bytes must

be sent to the device. Bits A15 and A10 must be set to

logic ‘0’ and bit A11 must be set to logic ‘1’. Current

address reads of the Security register are not

supported.

The first 16 bytes of the Security register are, by

definition, read-only and contain a preprogrammed,

ensured unique, 128-bit serial number. The remaining

240 bytes on the first page of the Security register are

reserved for future use and are set to read-only.

The upper 256 bytes of the Security register are

user-programmable and can be locked from any future

programming operations (see Section 10.4 “Locking

the Security Register” for further details).

When the end of the Security register is reached

(512 bytes of data), the word address will roll over to

the beginning of the Security register, starting with the

Most Significant Byte (Byte 0) of the 128-bit serial

number.

The serial number read operation, or any read of the

Security register, is terminated when the host does not

respond with an ACK and issues a Stop condition.

FIGURE 10-1:

SECURITY REGISTER READ SEQUENCE

Note:

Accessing the Security register is only

possible if any sequence or command to

the EEPROM (if one has been sent) has

been properly terminated with a Stop

condition. Without proper termination of

the previous sequence, communications

with the Security register will not execute

successfully.

Note:

If the application is to read the first byte of

the serial number, the word address input

needs to be 0800h.

SCL

MSb

SDA

123

Word Address – Byte 1

Word Address – Byte 0

Device Address Byte

011

x A8 0 A7 A6 A5 A4 A3 A2

A1 A0

A2 A1 x

ACK

from

Client

ACK

from

Client

ACK

from

Client

Start by

Host

MSb

123

Security Register Data

Device Address Byte

D7 D6 D5 D4 D3 D2 D1 D0 01

A2 A1 x

NACK

from

Host

ACK

from

Host

ACK

from

Client

Stop by

Host

Byte n

Byte 0

Start by

Host

D7 D6 D5 D4 D3 D2 D1 D0

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