S-24C02DI-J8T1U5 Datasheet, PDF (13/47 Pages) Seiko Instruments Inc – Write protect function during low power supply voltage

Rev.3.0_01_U
2-WIRE SERIAL E²PROM
S-24C02D/04D/08D16D
6. Device addressing
To start communication, the master device on the system generates a start condition to the bus line. Next, the master
device sends 7-bit device address and a 1-bit read / write instruction code on to the SDA bus.
The higher 4 bits of the device address are the "Device Code", and are fixed to "1010".
In the S-24C02D, successive 3 bits are the "Slave Address". These 3 bits are used to identify a device on the system
bus and are compared with the predetermined value which is defined by the address input pins (A2, A1, A0). When
the comparison result matches, the slave device responds with an acknowledge during the 9th clock cycle.
In the S-24C04D, successive 2 bits are the "Slave Address". These 2 bits are used to identify a device on the system
bus and are compared with the predetermined value which is defined by the address input pins (A2, A1). When the
comparison result matches, the slave device responds with an acknowledge during the 9th clock cycle.
The successive 1 bit (P0) is used to define a page address and choose the two 256-byte memory blocks (Address
000h to 0FFh, 100h to 1FFh).
In the S-24C08D, successive 1 bit is called the "Slave Addrdess". This 1 bit is used to identify a device on the system
bus and is compared with the predetermined value which is defined by the address input pin (A2). When the
comparison result matches, the slave device responds with an acknowledge during the 9th clocks cycle.
The successive 2 bits (P1, P0) are used to define a page address and choose the four 256-byte memory blocks
(Address 000h to 0FFh, 100h to 1FFh, 200h to 2FFh , 300h to 3FFh).
In the S-24C16D, successive 3 bits (P2, P1, P0) are "Page Address". Choose the 8 memory blocks of 256-byte
(Adress 000h to 0FFh, 100h to 1FFh, 200h to 2FFh, 300h to 3FFh, 400h to 4FFh, 500h to 5FFh, 600h to 6FFh, 700h
to 7FFh).
In the case of the product with SOT-23-5, set the slave address transmitting from the master device to "0".
Device Code
Slave / Page
Address
S-24C02D
1
0
1
0
A2 A1 A0 R / W
S-24C04D
1
0
1
0
A2 A1 P0 R / W
S-24C08D
1
0
1
0
A2 P1 P0 R / W
S-24C16D
1
MSB
0
1
0
P2 P1 P0 R / W
LSB
Figure 8 Device Address
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