24FC65T View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'24FC65T' PDF : 14 Pages View PDF
24FC65
8.0 PIN DESCRIPTIONS
8.1 A0, A1, A2 Chip Address Inputs
The A0..A2 inputs are used by the 24FC65 for multiple
device operation and conform to the two-wire bus
standard. The levels applied to these pins define the
address block occupied by the device in the address
map. A particular device is selected by transmitting the
corresponding bits (A2, A1, A0) in the control byte
(Figure 3-2 and Figure 8-1).
8.2 SDA Serial Address/Data Input/Output
This is a bidirectional pin used to transfer addresses
and data into and data out of the device. It is an open
drain terminal, therefore the SDA bus requires a pullup
resistor to VCC (typical 2 KΩ, must consider total bus
capacitance and maximum rise/fall times).
For normal data transfer SDA is allowed to change only
during SCL low. Changes during SCL high are
reserved for indicating the START and STOPs.
8.3 SCL Serial Clock
This input is used to synchronize the data transfer from
and to the device.
FIGURE 8-1: CONTROL SEQUENCE BIT ASSIGNMENTS
CONTROL
BYTE
ADDRESS
BYTE 1
ADDRESS
BYTE 0
CONFIGURATION
BYTE
1
0
1
0
A
2
AAR
1 0W
Slave Device
Address Select
Bits
S
0
0
A AA
12 11 10
A
9
A
8
A
7
•
•
•
•
•
•
A
0
R
X
X
B
3
B
2
B
1
B
0
S/HE
Block
Count
Security Read
Acknowledge
No
S
atr
Acknowledges from Device
from Master
ACK
Data from Device
Data from Device
S
ot
t
R
p
101
0
A
2
A
1
A
0
A
0
C
K
1
XXXX
A
X X XCX
K
XXXX XX
A
X
C
K
1
1 XXX
XX
A
X
C
K
1
111
B
3
B
2
B
1
B
0
A
C
K
1
111
NNNN
3 21 0
S/HE
Starting Block
Number of
Security Write
Number
Blocks to
Protect
S
atr
Acknowledges from Device
S
ot
t
R
p
1
01
0
A
2
A
1
A
0
A
0
C
K
1
X
X
B
3
B
2
B
1
B
0
A
XCX
K
XXXX
XX
A
X
C
K
1
0
X
X
N
3
N
2
N
1
N
0
A
C
K
Starting Block
S/HE
Number of
Number
Blocks to
Protect
High Endurance Block Read
No
S
atr
Acknowledges from Device
ACK
S
Data from Device
ot
t
R
p
1
01
0
A
2
AA
10
A
0
C
K
1
XXXX
XX
A
XC X
K
XXXX
XX
A
X
C
K
0
1
XXX
XX
A
X
C
K
1
1
1
1
B BB
321
B
0
A
C
K
S/HE
High Endurance
Block Number
High Endurance Block Write
S
atr
t
Acknowledges from Device
S
t
R
o
p
1
01
0
A
2
A
1
A
0
A
0
C
K
1
X
X
B
3
B
2
B
1
B
0
A
XCX
K
XXXX
XX
A
X
C
K
00
XX
0
0
0
A
0C
K
S/HE
High Endurance
Block Number
2004 Microchip Technology Inc.
DS21125E-page 11
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