M34S32 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

M34S32

32K Serial I2C Bus EEPROM With User-Defined Read-Only Block and 32-Byte OTP Page

STMicroelectronics 

M34S32

If one bit of the Address bytes (excluding the three

most significant bits which are Don’t Care) differs

from the above values, the Address will be ac-

knowledged, data will not be acknowledged and

the WRITE instruction will be ignored.

The Page Write instruction must start with the first

byte that is located in the OTP page (address 0h),

otherwise the instruction will be ignored.

The first Write to the OTP page (whether it be a 1-

byte write, a 32-byte page write, or some size in

between) will disable any further write in the OTP

page.

Let us suppose that byte N of the OTP page has

just been addressed (for example because of a

Write in the OTP page or a Random read in the

OTP page). If the next instruction uses the Current

Read Mode of the device, the first byte read in

EEPROM will be in page 0, at address N+1 (or

page 1, byte 0 if the last OTP byte addressed was

at location 31).

Example of a correct sequence, leading to a 3-

byte write in the OTP page:

Start

1010 0010

(OTP page select code)

Ack

1111 0000

(upper address, MSB)

Ack

0000 0000

(lower address, LSB)

Ack

0100 1101

(write 3 bytes of data)

Ack

(in the OTP page)

1100 1010

Ack

0101 0011

Ack

Stop

Figure 9. Write Cycle Polling using ACK

WRITE Cycle

in Progress

START Condition

DEVICE SELECT

with RW = 0

First byte of instruction

with RW = 0 already

decoded by M34Sxx

NO ACK

Returned

YES

Next

NO

Operation is

Addressing the

Memory

ReSTART

YES

Send

Byte Address

STOP

Proceed

WRITE Operation

Proceed

Random Address

READ Operation

AI02418

10/18

Share Link: