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9-Output LED Driver with Intensity Control
and Hot-Insertion Protection
COMMAND BYTE IS STORED ON RECEIPT OF
STOP CONDITION
D15
D14
D13
D12
D11
D10
D9
D8
ACKNOWLEDGE FROM MAX6965
S
SLAVE ADDRESS
0
A
COMMAND BYTE
A
P
Figure 7. Command Byte Received
R/W
ACKNOWLEDGE FROM MAX 6965
ACKNOWLEDGE FROM MAX6965
ACKNOWLEDGE FROM MAX 6965
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX 6965 's REGISTERS
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
ACKNOWLEDGE FROM MAX 6965
S
SLAVE ADDRESS
0
A
COMMAND BYTE
A
DATA BYTE
A
P
1
R/W
BYTE
AUTOINCREMENT MEMORY ADDRESS
Figure 8. Command and Single Data Byte Received
ACKNOWLEDGE FROM MAX6965
ACKNOWLEDGE FROM MAX6965
HOW COMMAND BYTE AND DATA BYTE MAP INTO
MAX6965's REGISTERS
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
ACKNOWLEDGE FROM MAX6965
S
SLAVE ADDRESS
0
A
COMMAND BYTE
A
DATA BYTE
A
P
N
R/W
BYTES
AUTOINCREMENT MEMORY ADDRESS
Figure 9. n Data Bytes Received
WRITE TO OUTPUT PORTS REGISTERS (BLINK PHASE 0 REGISTERS/BLINK PHASE 1 REGISTERS)
SCL
1
2
3
4
5
6
7
8
9
SLAVE ADDRESS
COMMAND BYTE
SDA S A6 A5 A4 A3 A2 A1 A0
0
A
0
0
0
0
0
0
0
1
A MSB
DATA1
LSB
A MSB
DATA2
LSB A
P
START CONDITION
R/W ACKNOWLEDGE FROM SLAVE
ACKNOWLEDGE FROM SLAVE
ACKNOWLEDGE FROM SLAVE
STOP
CONDITION
O7–O0
Figure 10. Write Timing Diagram
t DV
DATA1 VALID
t DV
DATA2 VALID
Message Format for Reading
The MAX6965 is read using the MAX6965’s internally
stored command byte as an address pointer the same
way the stored command byte is used as an address
pointer for a write. The pointer autoincrements after
each data byte is read using the same rules as for a
write (Table 2). Thus, a read is initiated by first configur-
ing the MAX6965 ’s command byte by performing a
write (Figure 7). The master can now read n consecu-
tive bytes from the MAX6965 with the first data byte
being read from the register addressed by the initial-
ized command byte. When performing read-after-write
verification, remember to reset the command byte’s
address because the stored command byte address
has been autoincremented after the write (Table 2).
_______________________________________________________________________________________
9
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