2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or

28-Port LED Display Driver and I/O Expander

10

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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 1

VIRTUAL SEGMENTS

VIRTUAL SEGMENTS

7-SEGMENT DIGIT 5

7-SEGMENT DIGIT 6

7-SEGMENT DIGIT 7

7-SEGMENT DIGIT 2

7-SEGMENT DIGIT 3

7-SEGMENT DIGIT 4

V+

V+

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

SA

A

P

0

SLAVE ADDRESS

COMMAND BYTE

ACKNOWLEDGE FROM MAX6956

R/W

ACKNOWLEDGE FROM MAX6956

D15 D14 D13 D12 D11 D10

D9

D8

COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION

COMMAND BYTE RECEIVED

Figure 8. Command Byte Received

SA

A

A

P

0

SLAVE ADDRESS

COMMAND BYTE

DATA BYTE

ACKNOWLEDGE FROM MAX6956

1 BYTE

D15 D14

D13 D12

D11 D10

D9

D8

D1

D0

D3

D2

D5

D4

D7

D6

HOW COMMAND BYTE AND DATA BYTE MAP INTO MAX6956's REGISTER

ACKNOWLEDGE FROM MAX6956

ACKNOWLEDGE FROM MAX6956

R/W

Figure 9. Command and Single Data Byte Received