MAX6954AAX+ Datasheet MAX6954AAX+, MAX6954ATL+, MAX6954ATL+T | P28-P30

MAX6954

4-Wire Interfaced, 2.7V to 5.5V LED Display

Driver with I/O Expander and Key Scan

28 ______________________________________________________________________________________

DUTY

CYCLE

TYPICAL

SEGMENT

CURRENT (mA)

ADDRESS

CODE

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

HEX

CODE

1/16 (min on) 2.5 0x10 to 0x17 0 0 0 0

0x0X

2/16 5 0x10 to 0x17 0 0 0 1

0x1X

3/16 7.5 0x10 to 0x17 0 0 1 0

0x2X

4/16 10 0x10 to 0x17 0 0 1 1

0x3X

5/16 12.5 0x10 to 0x17 0 1 0 0

0x4X

6/16 15 0x10 to 0x17 0 1 0 1

0x5X

7/16 17.5 0x10 to 0x17 0 1 1 0

0x6X

8/16 20 0x10 to 0x17 0 1 1 1

0x7X

9/16 22.5 0x10 to 0x17 1 0 0 0

0x8X

10/16 25 0x10 to 0x17 1 0 0 1

0x9X

11/16 27.5 0x10 to 0x17 1 0 1 0

0xAX

12/16 30 0x10 to 0x17 1 0 1 1

0xBX

13/16 32.5 0x10 to 0x17 1 1 0 0

0xCX

14/16 35 0x10 to 0x17 1 1 0 1

0xDX

15/16 37.5 0x10 to 0x17 1 1 1 0

0xEX

15/16 (max on) 37.5 0x10 to 0x17 1 1 1 1

See Table 28.

0xFX

Table 29. Odd Individual Segment Intensity Format

MODE

ADDRESS

CODE (HEX)

D7 D6 D5 D4 D3 D2 D1 D0

Write GPIO Data 0x05 X X X P4 P3 P2 P1 P0

Read GPIO Data

0x85 0 0 0

P4 or IRQ status

P3 P2 P1 P0

Table 30. GPIO Data Register

KEYS

SCANNED

PORTS

AVAILABLE

P0 P1 P2 P3 P4

None 5 pins GPIO GPIO GPIO GPIO GPIO

1 to 8 3 pins Key_A GPIO GPIO GPIO IRQ

9 to 16 2 pins Key_A Key_B GPIO GPIO IRQ

17 to 24 1 pin Key_A Key_B Key_C GPIO IRQ

25 to 36 None Key_A Key_B Key_C Key_D IRQ

Table 31. Port Scanning Function Allocation

MAX6954

4-Wire Interfaced, 2.7V to 5.5V LED Display

Driver with I/O Expander and Key Scan

______________________________________________________________________________________ 29

MODE

ADDRESS

CODE (HEX)

D7 D6 D5 D4 D3 D2 D1 D0

GPIO

Configuration

0x06 Set number of keys scanned

Set port direction for ports P0 to P4:

0 = output, 1 = input

PORT ALLOCATION OPTIONS

0 Keys Scanned 0x06 0 0 0 P4 P3 P2 P1 P0

8 Keys Scanned 0x06 0 0 1 IRQ P3 P2 P1

Key_A

16 Keys Scanned

0x06 0 1 0 IRQ P3 P2

Key_B

Key_A

24 Keys Scanned

0x06 0 1 1 IRQ P3

Key_C Key_B

Key_A

32 Keys Scanned

0x06 1 X X IRQ

Key_D Key_C Key_B

Key_A

EXAMPLE PORT CONFIGURATION SETTINGS

No Keys

Scanned, P4 and

P2 Are Outputs,

Others Are Inputs

0x06 00001011

8 Keys Scanned,

P3 and P1 Are

Outputs, P2 Is an

Input

0x06 001X010X

32 Keys

Scanned, No

GPIO Ports

0x06 1XXXXXXX

Table 32. Port Configuration Register Format

WITH APPROPRIATE SWITCH NAMED BELOW

KEY

MASK

ADDRESS

CODE

(HEX

D7 D6 D5 D4 D3 D2 D1 D0

Key_A Mask

0x08

SW_A7 SW_A6 SW_A5 SW_A4 SW_A3 SW_A2 SW_A1 SW_A0

Key_B Mask

0x09

SW_B7 SW_B6 SW_B5 SW_B4 SW_B3 SW_B2 SW_B1 SW_B0

Key_C Mask

0x0A

SW_C7 SW_C6 SW_C5 SW_C4 SW_C3 SW_C2 SW_C1 SW_C0

Key_D Mask

0x0B

SW_ D7 SW_D6 SW_D5 SW_D4 SW_D3 SW_D2 SW_D1 SW_D0

Table 33. Key Mask Register Format

MAX6954

4-Wire Interfaced, 2.7V to 5.5V LED Display

Driver with I/O Expander and Key Scan

30 ______________________________________________________________________________________

KEY

DEBOUNCED

ADDRESS

CODE

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

Key_A

Debounced

0x88

SW_A7 SW_A6 SW_A5 SW_A4 SW_A3 SW_A2 SW_A1 SW_A0

Key_B

Debounced

0x89

SW_B7 SW_B6 SW_B5 SW_B4 SW_B3 SW_B2 SW_B1 SW_B0

Key_C

Debounced

0x8A

SW_C7 SW_C6 SW_C5 SW_C4 SW_C3 SW_C2 SW_C1 SW_C0

Key_D

Debounced

0x8B

SW_D7 SW_D6 SW_D5 SW_D4 SW_D3 SW_D2 SW_D1 SW_D0

Table 34. Key Debounced Register Format

KEY

PRESSED

ADDRESS

CODE

(HEX

D7 D6 D5 D4 D3 D2 D1 D0

Key_A

Pressed

0x8C

SW_A7 SW_A6 SW_A5 SW_A4 SW_A3 SW_A2 SW_A1

SW_A0

Key_B

Pressed

0x8D

SW_B7 SW_B6 SW_B5 SW_B4 SW_B3 SW_B2 SW_B1

SW_B0

Key_C

Pressed

0x8E

SW_C7 SW_C6 SW_C5 SW_C4 SW_C3 SW_C2 SW_C1

SW_C0

Key_D

Pressed

0x8F

SW_D7 SW_D6 SW_D5 SW_D4 SW_D3 SW_D2 SW_D1

SW_D0

Table 35. Key Pressed Register Format

MODE

ADDRESS

CODE

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

Normal Operation0x07 XXXXXXX 0

Display Test 0x07 X XXXXXX1

Table 36. Display Test Register

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P39

MAX6954AAX+

Mfr. #:

Buy MAX6954AAX+

Manufacturer:

Maxim Integrated

Description:

LED Display Drivers 2.7-5.5V LED Display Driver

Lifecycle:

New from this manufacturer.

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MAX6954AAX+

MAX6954AAX+

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