24CS512TESLASHCS0668 datasheet(31/66 Pages) MICROCHIP

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DS20005769C-page 31

24CS512

10.1

Custom Programming Option

The 24CS512 supports the preprogramming and sub-

sequent 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) and matching the hardware client address

bits (A2, A1, A0) to their corresponding device address

input pins. 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 defini-

tion, read-only and contain a preprogrammed, ensured

unique, 128-bit serial number. The remaining 112 bytes

on the first page of the Security register are reserved

for future use and set to read-only.

The upper 128 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 more details).

When the end of the Security register is reached

(256 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 num-

ber.

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 con-

dition. Without proper termination of the

previous sequence, communications with

the Security register will not execute suc-

cessfully.

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

0 A7 A6 A5 A4 A3 A2

A1 A0

A2 A1 A0

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 A0

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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