MAX6954 Maxim, MAX6954 Datasheet - Page 8

• Manufacturer Part Number: MAX6954
• Description: 4-Wire Interfaced / 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
• Manufacturer: Maxim

4-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
Table 3. Connection Scheme for Eight 14-Segment Digits
Table 4. Connection Scheme for Sixteen 7-Segment Digits
Table 5. Serial-Data Format (16 Bits)
Any register data within the MAX6954 may be read by
sending a logic high to bit D15. The sequence is:
1) Take CLK low.
8
DIGIT O0
DIGIT O0
*Each cathode driver output (CC0-CC7) connects to two digit common cathode pins.
D IG IT * O0
0, 0a C C 0
1, 1a
2, 2a
3, 3a
4, 4a
5, 5a
6, 6a
7, 7a
D15
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
_______________________________________________________________________________________
W
CCO
CCO
—
a1
a1
a1
a1
a1
a1
—
a
a
a
a
a
a
—
1a
1a
1a
1a
1a
1a
D14
CC1
CC1
CC1
O1
O1
O1
a2
a2
a2
a2
a2
a2
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
CC2
CC2
CC2
O2
O2
O2
a1
a1
1b
1b
1b
1b
—
—
1a
1a
—
b
D13
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
D12
Reading Device Registers
CC4
CC4
CC4
O4
O4
O4
d1
d1
—
—
1b
1b
1b
1b
1d
1d
—
b
b
b
b
b
b
b
b
d
d
D11
CC5
CC5
CC5
1dp
1dp
O5
O5
O5
d2
d2
—
—
—
—
1c
1c
1c
1c
—
c
c
c
c
c
c
c
c
D10
CC6
CC6
CC6
O6
O6
O6
d1
d1
d1
d1
d1
d1
1d
1d
1d
1d
1d
1d
—
—
—
d
d
d
d
d
d
CC7
CC7
CC7
1dp
1dp
1dp
1dp
1dp
1dp
O7
O7
O7
d2
d2
d2
d2
d2
d2
D9
—
—
—
—
—
—
—
—
—
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
D8
O9
O9
O9
1f
1f
1f
1f
1f
1f
1f
1f
2) Take CS low. This enables the internal 16-bit shift
3) Clock 16 bits of data into DIN, D15 first to D0 last.
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
f
D7
register.
D15 is high, indicating a read command and bits
D14 through D8 contain the address of the register
O10
O10
O10
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
g1
1g
1g
1g
1g
1g
1g
1g
1g
D6
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
D5
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
D4
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
D3
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
D2
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
D1
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
D0
O18
O18
2dp
2dp
2dp
2dp
2dp
2dp
2dp
2dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp
dp