Datasheet

Table 10. Segment Decoding for 7-Segment Displays
Table 9. Digit Plane Data Register Format
MODE
ADDRESS CODE
(HEX)
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
Segment Line
0x20 to 0x2F
0x40 to 0x4F
0x60 to 0x6F
dp a b c d e f g
MODE
ADDRESS
CODE
(HEX)
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
14-segment or 16-segment mode, writing digit data
to use font map data with decimal place unlit
0x20 to 0x2F
0x40 to 0x4F
0x60 to 0x6F
0 Bits D6 to D0 select font characters 0 to 127
14-segment or 16-segment mode, writing digit data
to use font map data with decimal place lit
0x20 to 0x2F
0x40 to 0x4F
0x60 to 0x6F
1 Bits D6 to D0 select font characters 0 to 127
7-segment decode mode, DP unlit
0x20 to 0x2F
0x40 to 0x4F
0x60 to 0x6F
0 0 0 0 D3 to D0
7-segment decode mode, DP lit
0x20 to 0x2F
0x40 to 0x4F
0x60 to 0x6F
1 0 0 0 D3 to D0
7-segment no-decode mode
0x20 to 0x2F
0x40 to 0x4F
0x60 to 0x6F
Direct control of 8 segments
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Maxim Integrated │ 21
MAX6954 4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan