AT24CS04 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT24CS04' PDF : 24 Pages View PDF
Serial Number Read: Reading the serial number is similar to the sequential read sequence but requires use of the
device address seen in Figure 10-1 on page 12, a dummy write, and the use of specific word address.
Note:
The entire 128-bit value must be read from the starting address of the serial number block to guarantee a
unique number.
Since the address pointer of the device is shared between the EEPROM array and the serial number block, a dummy
Write Sequence should be performed to ensure the address pointer is set to zero. Random reads of the serial number
block are supported but if the previous operation was to the EEPROM array, the address pointer will retain the last
access location, incremented by one. Reading the serial number from a location other than the initial address of the block
will not result in a unique serial number.
Additionally, the word address must begin with a ‘10’ sequence regardless of the intended address. If a word address
other than ‘10’ is used, then the device will output undefined data. Therefore, if the application desires to read the first
byte of the serial number, the word address input would need to be 80h.
When the end of the 128-bit serial number is reached (16 bytes of data), the data word address will roll-over back to the
beginning of the 128-bit serial number. The Serial Number Read operation is terminated when the microcontroller does
not respond with an zero (ACK) and instead issues a Stop condition (see Figure 10-6 on page 14).
Figure 10-1. Byte Write
S
W
T
R
A
I
R
T
T Device Address E
Word Address
S
T
O
Data
P
SDA LINE
M
RA
A
A
S
/C
C
C
B
WK
K
K
Figure 10-2. Page Write
S
W
T
R
A
I
R
T
T Device Address E
Word Address (n)
SDA LINE
M
RA
A
S
/C
C
B
WK
K
Data (n)
Data (n + 1)
S
T
O
Data (n + x)
P
A
A
A
C
C
C
K
K
K
Atmel AT24CS04/08 [PRELIMINARY DATASHEET] 12
8766B–SEEPR–8/12
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