MAX6954AAX+ Datasheet MAX6954AAX+, MAX6954ATL+, MAX6954ATL+T | P25-P27

MAX6954

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

Driver with I/O Expander and Key Scan

______________________________________________________________________________________ 25

MODE

D7 D6 D5 D4 D3 D2 D1

Configuration

PIRTEBX

Table 16. Configuration Register Format

MODE

D7 D6 D5 D4 D3 D2 D1 D0

Shutdown

PIRTEBX0

Normal

Operation

PIRTEBX1

Table 17. Shutdown Control (S Data Bit DO)

Format

MODE

D7 D6 D5 D4 D3 D2 D1 D0

Slow blinking. Segments blink on for 1s, off for 1s with f

OSC

= 4MHz.

RTE0X

Fast blinking. Segments blink on for 0.5s, off for 0.5s with f

OSC

= 4MHz.

RTE1X

Table 18. Blink Rate Selection (B Data Bit D2) Format

MODE

D7 D6 D5 D4 D3 D2 D1 D0

Blink function is disabled. P I R T 0 B X S

Blink function is enabled. P I R T 1 B X S

Table 19. Global Blink Enable/Disable (E Data Bit D3) Format

SEGMENT’S BIT SETTING

IN PLANE P1

SEGMENT’S BIT SETTING

IN PLANE P0

SEGMENT

BEHAVIOR

0 0 Segment off.

Segment on only during the 1st half of each

blink period.

Segment on only during the 2nd half of each

blink period.

1 1 Segment on.

Table 20. Digit Register Mapping with Blink Globally Enabled

MODE

D7 D6 D5 D4 D3 D2 D1 D0

Blink timing counters are unaffected. P I R 0 E B X S

Blink timing counters are reset on the rising edge of CS.PIR1EBXS

Table 21. Global Blink Timing Synchronization (T Data Bit D4) Format

MODE

D7 D6 D5 D4 D3 D2 D1 D0

Digit data for both planes P0 and P1 are unaffected.

0TEBXS

Digit data for both planes P0 and P1 are cleared on the rising edge of CS.

1TEBXS

Table 22. Global Clear Digit Data (R Data Bit D5) Format

MAX6954

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

Driver with I/O Expander and Key Scan

26 ______________________________________________________________________________________

MODE

D7 D6 D5 D4 D3 D2 D1

Intensity for all digits is controlled by one setting in the global intensity register.

P0RTEBX

Intensity for digits is controlled by the individual settings in the intensity10 and

intensity76 registers.

P1RTEBX

Table 23. Global Intensity (I Data Bit D6) Format

MODE

D7 D6 D5 D4 D3 D2 D1 D0

P1 Blink Phase 0 I R T E B X S

P0 Blink Phase 1 I R T E B X S

Table 24. Blink Phase Readback (P Data Bit D7) Format

SCAN

LIMIT

ADDRESS CODE

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

HEX

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 25. Scan-Limit Register Format

DUTY

CYCLE

TYPICAL

SEGMENT

CURRENT (mA)

ADDRESS

CODE (HEX)

D6 D5 D4 D3 D2 D1 D0

HEX

CODE

1/16 (min on) 2.5 0x02 X X X X 0 0 0 0 0xX0

2/16 5 0x02 X X X X 0 0 0 1 0xX1

3/16 7.5 0x02 X X X X 0 0 1 0 0xX2

4/16 10 0x02 X X X X 0 0 1 1 0xX3

5/16 12.5 0x02 X X X X 0 1 0 0 0xX4

6/16 15 0x02 X X X X 0 1 0 1 0xX5

7/16 17.5 0x02 X X X X 0 1 1 0 0xX6

8/16 20 0x02 X X X X 0 1 1 1 0xX7

9/16 22.5 0x02 X X X X 1 0 0 0 0xX8

10/16 25 0x02 X X X X 1 0 0 1 0xX9

11/16 27.5 0x02 X X X X 1 0 1 0 0xXA

12/16 30 0x02 X X X X 1 0 1 1 0xXB

13/16 32.5 0x02 X X X X 1 1 0 0 0xXC

14/16 35 0x02 X X X X 1 1 0 1 0xXD

15/16 37.5 0x02 X X X X 1 1 1 0 0xXE

15/16 (max on)

37.5 0x02 X X X X 1 1 1 1 0xXF

Table 26. Global Intensity Register Format

MAX6954

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

Driver with I/O Expander and Key Scan

______________________________________________________________________________________ 27

FUNCTION

ADDRESS

CODE (HEX)

D7 D6 D5 D4 D3 D2 D1 D0

Intensity10 Register 0x10 Digit 1 Digit 0

Intensity32 Register 0x11 Digit 3 Digit 2

Intensity54 Register 0x12 Digit 5 Digit 4

Intensity76 Register 0x13 Digit 7 Digit 6

Intensity10a Register 0x14 Digit 1a (7 segment only) Digit 0a (7 segment only)

Intensity32a Register 0x15 Digit 3a (7 segment only) Digit 2a (7 segment only)

Intensity54a Register 0x16 Digit 5a (7 segment only) Digit 4a (7 segment only)

Intensity76a Register 0x17 Digit 7a (7 segment only) Digit 6a (7 segment only)

Table 27. Individual Segment Intensity Registers

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 0000

0xX0

2/16 5 0x10 to 0x17 0001

0xX1

3/16 7.5 0x10 to 0x17 0010

0xX2

4/16 10 0x10 to 0x17 0011

0xX3

5/16 12.5 0x10 to 0x17 0100

0xX4

6/16 15 0x10 to 0x17 0101

0xX5

7/16 17.5 0x10 to 0x17 0110

0xX6

8/16 20 0x10 to 0x17 0111

0xX7

9/16 22.5 0x10 to 0x17 1000

0xX8

10/16 25 0x10 to 0x17 1001

0xX9

11/16 27.5 0x10 to 0x17 1010

0xXA

12/16 30 0x10 to 0x17 1011

0xXB

13/16 32.5 0x10 to 0x17 1100

0xXC

14/16 35 0x10 to 0x17 1101

0xXD

15/16 37.5 0x10 to 0x17 1110

0xXE

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

See Table 29.

1111

0xXF

Table 28. Even Individual Segment Intensity Format

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:

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MAX6954AAX+

MAX6954AAX+

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