MAX6954AAX+ Datasheet MAX6954AAX+, MAX6954ATL+, MAX6954ATL+T | P22-P24

MAX6954

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

Driver with I/O Expander and Key Scan

22 ______________________________________________________________________________________

DATA

ON SEGMENTS = 1

7-SEGMENT

CHARACTER

D7*

D6, D5,

D3 D2 D1 D0

DP*

ABCDEF

0 — X 0000—

111111

1 — X 0001—

011000

2 — X 0010—

110110

3 — X 0011—

111100

4 — X 0100—

011001

5 — X 0101—

101101

6 — X 0110—

101111

7 — X 0111—

111000

8 — X 1000—

111111

9 — X 1001—

111101

A — X 1010—

111011

B — X 1011—

001111

C — X 1100—

100111

D — X 1101—

011110

E — X 1110—

100111

F — X 1111—

100011

Table 11. 7-Segment Segment Mapping Decoder for Hexadecimal Font

DIGIT-TYPE

ADDRESS

CODE (HEX)

D7 D6 D5 D4 D3 D2 D1 D0

Output Drive Line

CC7 CC6 CC5 CC4 CC3 CC2 CC1

CC0

Slot Identification

0x0C

Slot 4 Slot 3 Slot 2 Slot 1

Table 12. Digit-Type Register

The decimal point is set by bit D7 = 1.

MAX6954

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

Driver with I/O Expander and Key Scan

______________________________________________________________________________________ 23

DECODE

MODE

ADDRESS

CODE

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

HEX

CODE

No decode for digit pairs 7 to 0. 0x01 00000000 0x00

Hexadecimal decode for digit pair 0,

no decode for digit pairs 7 to 1.

0x01 00000001 0x01

Hexadecimal decode for digit pairs 2 to 0,

no decode for digit pairs 7 to 3.

0x01 00000111 0x07

Hexadecimal decode for digit pairs 7 to 0.

0x01 11111111 0xFF

Table 14. Decode-Mode Register Examples

DIGIT-TYPE

ADDRESS

CODE (HEX)

D7 D6 D5 D4 D3 D2 D1 D0

Digits 7 to 0 are 16-segment or 7-

segment digits.

0x0C 00000000

Digit 0 is a 14-segment digit,

digits 7 to 1 are 16-segment or 7-

segment digits.

0x0C 00000001

Digits 2 to 0 are 14-segment

digits, digits 7 to 3 are 16-

segment or 7-segment digits.

0x0C 00000111

Digits 7 to 0 are 14-segment

digits.

0x0C 11111111

Table 13. Example Configurations for Display Digit Combinations

MAX6954

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

Driver with I/O Expander and Key Scan

24 ______________________________________________________________________________________

POWER-UP

CONDITION

ADDRESS

CODE

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

Decode Mode Decode mode enabled 0x01

11111111

Global Intensity 1/16 (min on) 0x02

XXXX0000

Scan Limit Display 8 digits: 0, 1, 2, 3, 4, 5, 6, 7 0x03

XXXXX111

Control Register

Shutdown enabled, blink speed is

slow, blink disabled

0x04

00XX0000

GPIO Data Outputs are low 0x05

XXX00000

Port Configuration

No key scanning, P0 to P4 are all

inputs

0x06

00011111

Display Test Normal operation 0x07

XXXXXXX0

Key_A Mask None of the keys cause interrupt 0x08

00000000

Key_B Mask None of the keys cause interrupt 0x09

00000000

Key_C Mask None of the keys cause interrupt 0x0A

00000000

Key_D Mask None of the keys cause interrupt 0x0B

00000000

Digit Type All are 16 segment or 7 segment 0x0C

00000000

Intensity10 1/16 (min on) 0x10

00000000

Intensity32 1/16 (min on) 0x11

00000000

Intensity54 1/16 (min on) 0x12

00000000

Intensity76 1/16 (min on) 0x13

00000000

Intensity10a 1/16 (min on) 0x14

00000000

Intensity32a 1/16 (min on) 0x15

00000000

Intensity54a 1/16 (min on) 0x16

00000000

Intensity76a 1/16 (min on) 0x17

00000000

Digit 0 Blank digit, both planes 0x60

00100000

Digit 1 Blank digit, both planes 0x61

00100000

Digit 2 Blank digit, both planes 0x62

00100000

Digit 3 Blank digit, both planes 0x63

00100000

Digit 4 Blank digit, both planes 0x64

00100000

Digit 5 Blank digit, both planes 0x65

00100000

Digit 6 Blank digit, both planes 0x66

00100000

Digit 7 Blank digit, both planes 0x67

00100000

Digit 0a Blank digit, both planes 0x68

00000000

Digit 1a Blank digit, both planes 0x69

00000000

Digit 2a Blank digit, both planes 0x6A

00000000

Digit 3a Blank digit, both planes 0x6B

00000000

Digit 4a Blank digit, both planes 0x6C

00000000

Digit 5a Blank digit, both planes 0x6D

00000000

Digit 6a Blank digit, both planes 0x6E

00000000

Digit 7a Blank digit, both planes 0x6F

00000000

Key_A Debounced No key presses have been detected 0x88

00000000

Key_B Debounced No key presses have been detected 0x89

00000000

Key_C Debounced

No key presses have been detected 0x8A

00000000

Key_D Debounced

No key presses have been detected 0x8B

00000000

Key_A Pressed Keys are not pressed 0x8C

00000000

Key_B Pressed Keys are not pressed 0x8D

00000000

Key_C Pressed Keys are not pressed 0x8E

00000000

Key_D Pressed Keys are not pressed 0x8F

00000000

Table 15. Initial Power-Up Register Status

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

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MAX6954AAX+

MAX6954AAX+

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