2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port LED Display Driver and I/O Expander
MAX6956
7-SEGMENT DIGIT 1
7-SEGMENT DIGIT 2
7-SEGMENT DIGIT 3
7-SEGMENT DIGIT 4
V+
VIRTUAL SEGMENTS
P0
P1
P2
P3
P4
P5
P6
P7
P8
P9 P10 P11 P12 P13 P14 P15 P16 P17 P18 P19 P20 P21 P22 P23 P24 P25 P26 P27 P28 P29 P30 P31
7-SEGMENT DIGIT 5
7-SEGMENT DIGIT 6
7-SEGMENT DIGIT 7
V+
VIRTUAL SEGMENTS
P0
P1
P2
P3
P4
P5
P6
P7
P8
P9 P10 P11 P12 P13 P14 P15 P16 P17 P18 P19 P20 P21 P22 P23 P24 P25 P26 P27 P28 P29 P30 P31
Figure 7. Two MAX6956s Controlling Seven 7-Segment Displays
COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION
ACKNOWLEDGE FROM MAX6956
S
SLAVE ADDRESS
COMMAND BYTE RECEIVED
R/W
0
A
D15 D14 D13 D12 D11 D10 D9
D8
COMMAND BYTE
ACKNOWLEDGE FROM MAX6956
A
P
Figure 8. Command Byte Received
ACKNOWLEDGE FROM MAX6956
HOW COMMAND BYTE AND DATA BYTE MAP INTO MAX6956's REGISTER
ACKNOWLEDGE FROM MAX6956
S
SLAVE ADDRESS
R/W
0
A
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
ACKNOWLEDGE FROM MAX6956
D5
D4
D3
D2
D1
D0
COMMAND BYTE
A
DATA BYTE
1 BYTE
A
P
Figure 9. Command and Single Data Byte Received
10
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