24CSM01 datasheet(34/63 Pages) MICROCHIP

34 / 63 page

24CSM01

DS20006781B

-page 34

Preliminary

 2023 Microchip Technology Inc. and its subsidiaries

11.0 MANUFACTURER

IDENTIFICATION REGISTER

The 24CSM01 offers the ability to query the device for

the manufacturer, density and revision information. By

using the reserved 7-bit host code F8h, the device will

return a 24-bit value that corresponds with the reserved

I2C identifier value, along with further data to signify a

1-Mbit density and the device revision.

To read the Manufacturer ID data, the host must send

a Start condition, followed by a reserved host code F8h,

specified to which all devices on the bus that support

the Manufacturer ID will ACK. Next, the device address

byte is sent, followed by a new Start condition. The

device address byte consists of the EEPROM device

type identifier (‘1010’), the selected hardware client

address and a “don’t care” value for both the MSb

address and the R/W bit. Then, the reserved host code,

F9h, is sent and only the specific device that was

previously identified will return an ACK.

Now the 24CSM01 is ready to return its unique 24-bit

Manufacturing ID value.

The first byte of Manufacturer ID data contains the eight

Most Significant bits (D23-D16) of the 24-bit data value.

The host can then return an ACK to indicate it

successfully received the data, upon which the device

will send the second byte (D15-D8) of Manufacturer ID

data. The process repeats until all three bytes have

been read out and the host sends a NACK (logic ‘1’) to

complete the sequence. If the host ACKs (logic ‘0’) the

third byte, the internal Address Pointer will roll over back

to the first byte of Manufacturer ID data.

FIGURE 11-1:

MANUFACTURER IDENTIFICATION REGISTER READ SEQUENCE

Note:

A repeated Start condition must be sent to

the

24CSM01

when

reading

the

Manufacturer ID. Once a Stop condition is

sent, the internal Address Pointer will

reset and the Manufacturer ID will not be

read.

SCL

MSb

SDA

123

Host Code F9h

Device Address Byte

Host Code F8h

0 A2 A1 xx0

ACK

from

Client

ACK

from

Client

ACK

from

Client

Start by

Host

MSb

123

Manufacturer ID – Byte 2

Manufacturer ID – Byte 1

Manufacturer ID – Byte 0

D23 D22 D21 D20

D16

D15 D14 D13 D12 D11 D10 D9 D8 01

D19 D18 D17

NACK

from

Host

ACK

from

Host

ACK

from

Host

Stop by

Host

D7 D6 D5 D4 D3 D2 D1 D0

Repeated

Start by

Host

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