MAX6955_15 Datasheet, PDF (29/40 Pages) Maxim Integrated Products – 2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

MAX6955
2-Wire Interfaced, 2.7V to 5.5V
LED Display Driver with I/O
Expander and Key Scan
Table 30. Odd Individual Segment Intensity Format
DUTY
CYCLE
TYPICAL
SEGMENT
CURRENT (mA)
ADDRESS
CODE
(HEX)
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
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
0x10 to 0x17
0
0
0
0
0x10 to 0x17
0
0
0
1
0x10 to 0x17
0
0
1
0
0x10 to 0x17
0
0
1
1
0x10 to 0x17
0
1
0
0
0x10 to 0x17
0
1
0
1
0x10 to 0x17
0
1
1
0
0x10 to 0x17
0
1
1
1
0x10 to 0x17
1
0
0
0
0x10 to 0x17
1
0
0
1
0x10 to 0x17
1
0
1
0
0x10 to 0x17
1
0
1
1
0x10 to 0x17
1
1
0
0
0x10 to 0x17
1
1
0
1
0x10 to 0x17
1
1
1
0
0x10 to 0x17
1
1
1
1
See Table 29
HEX
CODE
0x0X
0x1X
0x2X
0x3X
0x4X
0x5X
0x6X
0x7X
0x8X
0x9X
0xAX
0xBX
0xCX
0xDX
0xEX
0xFX
Table 31. GPIO Data Register
MODE
ADDRESS
CODE (HEX)
D7
D6
D5
REGISTER DATA
D4
D3
D2
D1
D0
Write GPIO Data
0x05
X
X
X
P4
P3
P2
P1
P0
Read GPIO Data
0x05
0
0
0
P4 or IRQ status
P3
P2
P1
P0
Table 32. Port Scanning Function Allocation
KEYS
SCANNED
None
1 to 8
9 to 16
17 to 24
25 to 36
PORTS
AVAILABLE
5 pins
3 pins
2 pins
1 pin
None
P0
GPIO
Key_A
Key_A
Key_A
Key_A
P1
GPIO
GPIO
Key_B
Key_B
Key_B
P2
GPIO
GPIO
GPIO
Key_C
Key_C
P3
GPIO
GPIO
GPIO
GPIO
Key_D
P4
GPIO
IRQ
IRQ
IRQ
IRQ
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