MAX6955 Maxim, MAX6955 Datasheet - Page 29

• Manufacturer Part Number: MAX6955
• Description: 2-Wire Interfaced / 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
• Manufacturer: Maxim

Table 30. Odd Individual Segment Intensity Format
Table 31. GPIO Data Register
Table 32. Port Scanning Function Allocation
Write GPIO Data
Read GPIO Data
15/16 (max on)
1/16 (min on)
SCANNED
17 to 24
25 to 36
9 to 16
KEYS
CYCLE
None
1 to 8
MODE
DUTY
10/16
11/16
12/16
13/16
14/16
15/16
2/16
3/16
4/16
5/16
6/16
7/16
8/16
9/16
2-Wire Interfaced, 2.7V to 5.5V LED Display
______________________________________________________________________________________
CURRENT (mA)
CODE (HEX)
AVAILABLE
ADDRESS
Driver with I/O Expander and Key Scan
SEGMENT
TYPICAL
PORTS
5 pins
3 pins
2 pins
None
0x05
0x05
1 pin
12.5
17.5
22.5
27.5
32.5
37.5
37.5
2.5
7.5
10
15
20
25
30
35
5
D7
X
0
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
0x10 to 0x17
ADDRESS
Key_A
Key_A
Key_A
Key_A
CODE
GPIO
(HEX)
P0
D6
X
0
D5
X
0
D7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Key_B
Key_B
Key_B
GPIO
GPIO
P1
P4 or IRQ status
D6
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D4
P4
REGISTER DATA
D5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
REGISTER DATA
Key_C
Key_C
GPIO
GPIO
GPIO
P2
D4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
D3
P3
P3
D3
See Table 29.
Key_D
D2
GPIO
GPIO
GPIO
GPIO
D2
P2
P2
P3
D1
D1
P1
P1
D0
GPIO
IRQ
IRQ
IRQ
IRQ
P4
CODE
0xCX
0xDX
0xAX
0xBX
0xEX
0x0X
0x1X
0x2X
0x3X
0x4X
0x5X
0x6X
0x7X
0x8X
0x9X
0xFX
HEX
D0
P0
P0
29