MAX6955AAX+ Maxim Integrated Products, MAX6955AAX+ Datasheet - Page 8

• Manufacturer Part Number: MAX6955AAX+
• Description: IC DRIVER LED SEG 14/16 36-SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6955AAX+

• Display Type: LED
• Configuration: 7, 14, 16 Segment
• Interface: I²C
• Current - Supply: 22mA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP
• Number Of Digits: 16, 8, 8
• Number Of Segments: 7, 14, 16
• Low Level Output Current: 935000 uA
• High Level Output Current: 55000 uA
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Supply Current: 36 mA
• Maximum Power Dissipation: 941 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Digits Or Characters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
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.
Table 2. Connection Scheme for Eight 16-Segment Digits
Table 3. Connection Scheme for Eight 14-Segment Digits
Table 4. Connection Scheme for Sixteen 7-Segment Digits
8
DIGIT O0
DIGIT O0
DIGIT O0
0, 0a CC0
1, 1a
2, 2a
3, 3a
4, 4a
5, 5a
6, 6a
7, 7a
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
_______________________________________________________________________________________
CCO
CCO
a1
a1
a1
a1
a1
a1
—
—
—
1a
1a
1a
1a
1a
1a
a
a
a
a
a
a
CC1
CC1
CC1
O1
O1
O1
a2
a2
a2
a2
a2
a2
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
CC2
CC2
CC2
O2
O2
O2
1b
1b
1b
1b
a1
a1
1a
1a
—
—
—
Message Format for Writing
b
b
b
b
a
a
b
b
b
b
CC3
CC3
CC3
O3
O3
O3
a2
a2
—
—
—
1c
1c
1c
1c
—
—
—
—
c
c
c
c
c
c
c
c
CC4
CC4
CC4
O4
O4
O4
d1
d1
1b
1b
1b
1b
1d
1d
—
—
—
b
b
b
b
b
b
b
b
d
d
CC5
CC5
CC5
1dp
1dp
O5
O5
O5
1c
1c
1c
1c
d2
d2
—
—
—
—
—
c
c
c
c
c
c
c
c
CC6
CC6
CC6
O6
O6
O6
1d
1d
1d
1d
1d
1d
d1
d1
d1
d1
d1
d1
—
—
—
d
d
d
d
d
d
CC7
CC7
CC7
1dp
1dp
1dp
1dp
1dp
1dp
O7
O7
O7
—
d2
d2
d2
d2
d2
d2
—
—
—
—
—
—
—
—
O8
O8
O8
1e
1e
1e
1e
1e
1e
1e
1e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
e
O9
O9
O9
1f
1f
1f
1f
1f
1f
1f
1f
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).
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
O10
O10
O10
1g
1g
1g
1g
1g
1g
1g
1g
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
O11
O11
O11
g2
g2
g2
g2
g2
g2
g2
g2
g2
g2
g2
g2
g2
g2
g2
g2
2a
2a
2a
2a
2a
2a
2a
2a
O12
O12
O12
2b
2b
2b
2b
2b
2b
2b
2b
h
h
h
h
h
h
h
h
h
h
h
h
h
h
h
h
O13
O13
O13
2c
2c
2c
2c
2c
2c
2c
2c
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
i
O14
O14
O14
2d
2d
2d
2d
2d
2d
2d
2d
j
j
j
j
j
j
j
j
j
j
j
j
j
j
j
j
O15
O15
O15
2e
2e
2e
2e
2e
2e
2e
2e
k
k
k
k
k
k
k
k
k
k
k
k
k
k
k
k
O16
O16
O16
2f
2f
2f
2f
2f
2f
2f
2f
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
O17
O17
O17
2g
2g
2g
2g
2g
2g
2g
2g
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
m
O18
2dp
2dp
2dp
2dp
2dp
2dp
2dp
2dp
O18
O18
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp