MAX6954 Datasheet, PDF (26/38 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 23. Global Intensity (I Data Bit D6) Format
MODE
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
Intensity for all digits is controlled by one setting in the global intensity register. P 0 R T E B X S
Intensity for digits is controlled by the individual settings in the intensity10 and
intensity76 registers.
P1RTEBX S
Table 24. Blink Phase Readback (P Data Bit D7) Format
MODE
P1 Blink Phase
P0 Blink Phase
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
0
I
R
T
E
B
X
S
1
I
R
T
E
B
X
S
Table 25. Scan-Limit Register Format
SCAN
LIMIT
ADDRESS CODE
(HEX)
REGISTER DATA
HEX
D7 D6 D5 D4 D3 D2 D1 D0 ^CODE
Display Digit 0 only
0x03
X
X
X
X
X
0
0
0
0x00
Display Digits 0 and 1
0x03
X
X
X
X
X
0
0
1
0x01
Display Digits 0 1 2
0x03
X
X
X
X
X
0
1
0
0x02
Display Digits 0 1 2 3
0x03
X
X
X
X
X
0
1
1
0x03
Display Digits 0 1 2 3 4
0x03
X
X
X
X
X
1
0
0
0x04
Display Digits 0 1 2 3 4 5
0x03
X
X
X
X
X
1
0
1
0x05
Display Digits 0 1 2 3 4 5 6
0x03
X
X
X
X
X
1
1
0
0x06
Display Digits 0 1 2 3 4 5 6 7
0x03
X
X
X
X
X
1
1
1
0x07
Table 26. Global Intensity Register Format
DUTY
CYCLE
TYPICAL
SEGMENT
CURRENT (mA)
ADDRESS
CODE (HEX)
D7
D6
REGISTER DATA
HEX
D5 D4 D3 D2 D1 D0 ^CODE
1/16 (min on)
2.5
2/16
5
3/16
7.5
4/16
10
5/16
12.5
6/16
15
7/16
17.5
8/16
20
9/16
22.5
10/16
25
11/16
27.5
12/16
30
13/16
32.5
14/16
35
15/16
37.5
15/16 (max on)
37.5
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
0x02
X
X
X
X
0
0
0
0
0xX0
X
X
X
X
0
0
0
1
0xX1
X
X
X
X
0
0
1
0
0xX2
X
X
X
X
0
0
1
1
0xX3
X
X
X
X
0
1
0
0
0xX4
X
X
X
X
0
1
0
1
0xX5
X
X
X
X
0
1
1
0
0xX6
X
X
X
X
0
1
1
1
0xX7
X
X
X
X
1
0
0
0
0xX8
X
X
X
X
1
0
0
1
0xX9
X
X
X
X
1
0
1
0
0xXA
X
X
X
X
1
0
1
1
0xXB
X
X
X
X
1
1
0
0
0xXC
X
X
X
X
1
1
0
1
0xXD
X
X
X
X
1
1
1
0
0xXE
X
X
X
X
1
1
1
1
0xXF
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