24CS512 datasheet(35/66 Pages) MICROCHIP

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DS20005769C-page 35

24CS512

11.0 MANUFACTURER

IDENTIFICATION REGISTER

The 24CS512 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

512-Kbit 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 consist of the EEPROM device type

identifier (‘1010‘), the selected hardware client address

and the don’t care value for 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 24CS512 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 success-

fully 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 24CS512 when reading the Manu-

facturer 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 A0 x0

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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