MAX6954_09 Datasheet, PDF (8/39 Pages) Maxim Integrated Products – 4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

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
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 O9 O10 O11 O12 O13 O14 O15 O16 O17 O18
0, 0a CC0 — 1a — 1b 1c 1d 1dp 1e 1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp
1, 1a — CC1 1a — 1b 1c 1d 1dp 1e 1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp
2, 2a 1a — CC2 — 1b 1c 1d 1dp 1e 1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp
3, 3a 1a — — CC3 1b 1c 1d 1dp 1e 1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp
4, 4a 1a — 1b 1c CC4 — 1d 1dp 1e 1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp
5, 5a 1a — 1b 1c — CC5 1d 1dp 1e 1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp
6, 6a 1a — 1b 1c 1d 1dp CC6 — 1e 1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp
7, 7a 1a — 1b 1c 1d 1dp — CC7 1e 1f 1g 2a 2b 2c 2d 2e 2f 2g 2dp
*Each cathode driver output (CC0-CC7) connects to two digit common cathode pins.
Table 5. Serial-Data Format (16 Bits)
D15
D14
D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
R/W
ADDRESS
MSB
DATA
LSB
Reading Device Registers
Any register data within the MAX6954 may be read by
sending a logic high to bit D15. The sequence is:
1) Take CLK low.
2) Take CS low. This enables the internal 16-bit shift
register.
3) Clock 16 bits of data into DIN, D15 first to D0 last.
D15 is high, indicating a read command and bits
D14 through D8 contain the address of the register
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