MAX6955 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX6955

2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

Maxim Integrated 

MAX6955

2-Wire Interfaced, 2.7V to 5.5V

LED Display Driver with I/O

Expander and Key Scan

Table 2. Connection Scheme for Eight 16-Segment Digits

DIGIT O0 O1 O2 O3 O4 O5 O6 O7 O8

0 CCO — a1 a2 b c d1 d2 e

1 — CC1 a1 a2 b c d1 d2 e

2 a1 a2 CC2 — b c d1 d2 e

3 a1 a2 — CC3 b c d1 d2 e

4 a1 a2 b c CC4 — d1 d2 e

5 a1 a2 b c — CC5 d1 d2 e

6 a1 a2 b c d1 d2 CC6 — e

7 a1 a2 b c d1 d2 — CC7 e

O9 O10 O11 O12 O13 O14 O15 O16 O17 O18

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

Table 3. Connection Scheme for Eight 14-Segment Digits

DIGIT O0 O1 O2 O3 O4 O5 O6 O7 O8

0 CCO — a — b c d — e

1 — CC1 a — b c d — e

2 a — CC2 — b c d — e

3 a — — CC3 b c d — e

4 a — b c CC4 — d — e

5 a — b c — CC5 d — e

6 a — b c d — CC6 — e

7 a — b c d — — CC7 e

O9 O10 O11 O12 O13 O14 O15 O16 O17 O18

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

f g1 g2 h

i

j

k

l m dp

Table 4. Connection Scheme for Sixteen 7-Segment Digits

DIGIT O0 O1 O2 O3 O4 O5 O6 O7 O8

0, 0a CC0 — 1a — 1b 1c 1d 1dp 1e

1, 1a — CC1 1a — 1b 1c 1d 1dp 1e

2, 2a 1a — CC2 — 1b 1c 1d 1dp 1e

3, 3a 1a — — CC3 1b 1c 1d 1dp 1e

4, 4a 1a — 1b 1c CC4 — 1d 1dp 1e

5, 5a 1a — 1b 1c — CC5 1d 1dp 1e

6, 6a 1a — 1b 1c 1d 1dp CC6 — 1e

7, 7a 1a — 1b 1c 1d 1dp — CC7 1e

O9 O10 O11 O12 O13 O14 O15 O16 O17 O18

1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp

1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp

1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp

1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp

1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp

1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp

1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp

1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp

Message Format for Writing

A write to the MAX6955 comprises the transmission of

the MAX6955’s slave address with the R/W bit set to

zero, followed by at least 1 byte of information. The first

byte of information is the command byte, which deter-

mines which register of the MAX6955 is to be written by

the next byte, if received. If a STOP condition is detect-

ed after the command byte is received, then the

MAX6955 takes no further action (Figure 7) beyond

storing the command byte.

Any bytes received after the command byte are data

bytes. The first data byte goes into the internal register of

the MAX6955 selected by the command byte (Figure 8).

If multiple data bytes are transmitted before a STOP

condition is detected, these bytes are generally stored

in subsequent MAX6955 internal registers because the

command byte address generally autoincrements

(Table 6) (Figure 9).

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