Keywords: LED display drivers, LED drivers, display drivers, SPI, serial, blink, 3V
Related Parts 


QuickStart: Driving 16Segment Displays with the MAX6954 
DIGIT  O0  O1  O2  O3  O4  O5  O6  O7  O8  O9  O10  O11  O12  O13  O14  O15  O16  O17  O18 
0  CCO  a1  a2  b  c  d1  d2  e  f  g1  g2  h  i  j  k  l  m  dp  
1  CC1  a1  a2  b  c  d1  d2  e  f  g1  g2  h  i  j  k  l  m  dp  
2  a1  a2  CC2  b  c  d1  d2  e  f  g1  g2  h  i  j  k  l  m  dp  
3  a1  a2  CC3  b  c  d1  d2  e  f  g1  g2  h  i  j  k  l  m  dp  
4  a1  a2  b  c  CC4  d1  d2  e  f  g1  g2  h  i  j  k  l  m  dp  
5  a1  a2  b  c  CC5  d1  d2  e  f  g1  g2  h  i  j  k  l  m  dp  
6  a1  a2  b  c  d1  d2  CC6  e  f  g1  g2  h  i  j  k  l  m  dp  
7  a1  a2  b  c  d1  d2  CC7  e  f  g1  g2  h  i  j  k  l  m  dp 
REGISTER  POWERUP CONDITION  ADDRESS (HEX) 
REGISTER DATA  
D7  D6  D5  D4  D3  D2  D1  D0  
Decode Mode  16segment font enabled  0x01  1  1  1  1  1  1  1  1 
Global Intensity  1/16 (minimum intensity)  0x02  X  X  X  X  0  0  0  0 
Scan Limit  Display eight 16segment digits: 0, 1, 2, 3, 4, 5, 6, 7  0x03  X  X  X  X  X  1  1  1 
Control Register  Shutdown enabled, blink disabled, blink speed is slow  0x04  0  0  X  X  0  0  0  0 
Display Test  Normal operation (display test disabled)  0x07  X  X  X  X  X  X  X  0 
Digit Type  Digits 0 through 7 are 16 segment digits  0x0C  0  0  0  0  0  0  0  0 
Intensity10  1/16 (min on), digits 1 and 0  0x10  0  0  0  0  0  0  0  0 
Intensity32  1/16 (min on), digits 3 and 2  0x11  0  0  0  0  0  0  0  0 
Intensity54  1/16 (min on), digits 5 and 4  0x12  0  0  0  0  0  0  0  0 
Intensity76  1/16 (min on), digits 7 and 6  0x13  0  0  0  0  0  0  0  0 
Digit 0  Blank digit, both planes  0x60  0  0  1  0  0  0  0  0 
Digit 1  Blank digit, both planes  0x61  0  0  1  0  0  0  0  0 
Digit 2  Blank digit, both planes  0x62  0  0  1  0  0  0  0  0 
Digit 3  Blank digit, both planes  0x63  0  0  1  0  0  0  0  0 
Digit 4  Blank digit, both planes  0x64  0  0  1  0  0  0  0  0 
Digit 5  Blank digit, both planes  0x65  0  0  1  0  0  0  0  0 
Digit 6  Blank digit, both planes  0x66  0  0  1  0  0  0  0  0 
Digit 7  Blank digit, both planes  0x67  0  0  1  0  0  0  0  0 
CONFIGURATION REGISTER DATA BIT 
DATA BIT LABEL 
STATE  FUNCTION 
D7  P  0  P1 Blink Phase 
1  P0 Blink Phase  
D6  I  0  Intensity for all digits is controlled by one setting in the Global Intensity Register 
1  Intensity for digits is controlled by the individual settings in the Intensity10 through Intensity76 registers. 

D5  R  0  Digit data for both planes P0 and P1 are unaffected 
1  Digit data for both planes P0 and P1 are cleared on the rising edge of activelow CS  
D4  T  0  Blink timing counters are unaffected. 
1  Blink timing counters are reset on the rising edge of activelow CS.  
D3  E  0  Blink function disabled 
1  Blink function enabled  
D2  B  0  Slow Blinking. Segments blink on for 1s, off for 1s with f_{OSC} = 4MHz. 
1  Fast Blinking. Segments blink on for 0.5s, off for 0.5s with f_{OSC} = 4MHz.  
D1  X  X  Don't care 
D0  S  0  Shutdown 
1  Normal Operation 
MODE  ADDRESS CODE (HEX)  REGISTER DATA  
D7  D6  D5  D4  D3  D2  D1  D0  
16segment mode, writing digit data to use font map data with decimal place unlit  0x20 to 0x27 0x40 to 0x47 0x60 to 0x67 
0  Bits D6 to D0 select font character 0 to 127  
16segment mode, writing digit data to use font map data with decimal place lit  0x20 to 0x27 0x40 to 0x47 0x60 to 0x67  1  Bits D6 to D0 select font character 0 to 127 
REGISTER ADDRESS (HEX) 
DIGIT  CHARACTER  FONT MAP EQUIVALENT CODE  
DECIMAL  HEX  
0x20  0  M  0100 1101  0x4D 
0x21  1  A  0100 0001  0x41 
0x22  2  X  0101 1000  0x58 
0x23  3  I  0100 1001  0x49 
0x24  4  M  0100 1101  0x4D 
0x25  5    0010 1101  0x2D 
0x26  6  I  0100 1001  0x49 
0x27  7  C  0100 0011  0x43 
REGISTER (HEX) 
COMMAND (HEX) 
FUNCTION 
0x07  0x01  Enter display test mode 
0x07  0x00  Exit display test mode 
0x04  0x01  Exit shutdown mode, disable blinking and select global intensity control 
0x20  0x4D  Write "M" to digit 0 
0x21  0x41  Write "A" to digit 1 
0x22  0x58  Write "X" to digit 2 
0x23  0x49  Write "I" to digit 3 
0x24  0x4D  Write "M" to digit 4 
0x25  0x2D  Write "" to digit 5 
0x26  0x49  Write "I." to digit 6 
0x27  0x43  Write "C" to digit 7 
0x02  0xFF  Set globalk intensity to fullscale 
REGISTER  ADDRESS (COMMAND BYTE)  ADDRESS (HEX CODE) 

D15  D14  D13  D12  D11  D10  D9  D8  
Decode Mode  R/activelow W  0  0  0  0  0  0  1  0x01 
Global Intensity  R/activelow W  0  0  0  0  0  1  0  0x02 
Scan Limit  R/activelow W  0  0  0  0  0  1  1  0x03 
Configuration  R/activelow W  0  0  0  0  1  0  0  0x04 
Display Test  R/activelow W  0  0  0  0  1  1  1  0x07 
Digit Type  R/activelow W  0  0  0  1  1  0  0  0x0C 
Intensity 10  R/activelow W  0  0  1  0  0  0  0  0x10 
Intensity 32  R/activelow W  0  0  1  0  0  0  1  0x11 
Intensity 54  R/activelow W  0  0  1  0  0  1  0  0x12 
Intensity 76  R/activelow W  0  0  1  0  0  1  1  0x13 
Digit 0 Plane P0  R/activelow W  0  1  0  0  0  0  0  0x20 
Digit 1 Plane P0  R/activelow W  0  1  0  0  0  0  1  0x21 
Digit 2 Plane P0  R/activelow W  0  1  0  0  0  1  0  0x22 
Digit 3 Plane P0  R/activelow W  0  1  0  0  0  1  1  0x23 
Digit 4 Plane P0  R/activelow W  0  1  0  0  1  0  0  0x24 
Digit 5 Plane P0  R/activelow W  0  1  0  0  1  0  1  0x25 
Digit 6 Plane P0  R/activelow W  0  1  0  0  1  1  0  0x26 
Digit 7 Plane P0  R/activelow W  0  1  0  0  1  1  1  0x27 
Digit 0 Plane P1  R/activelow W  1  0  0  0  0  0  0  0x40 
Digit 1 Plane P1  R/activelow W  1  0  0  0  0  0  1  0x41 
Digit 2 Plane P1  R/activelow W  1  0  0  0  0  1  0  0x42 
Digit 3 Plane P1  R/activelow W  1  0  0  0  0  1  1  0x43 
Digit 4 Plane P1  R/activelow W  1  0  0  0  1  0  0  0x44 
Digit 5 Plane P1  R/activelow W  1  0  0  0  1  0  1  0x45 
Digit 6 Plane P1  R/activelow W  1  0  0  0  1  1  0  0x46 
Digit 7 Plane P1  R/activelow W  1  0  0  0  1  1  1  0x47 
Related Parts  
MAX6954  4Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan  Free Samples 
MAX6955  2Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan  Free Samples 
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© Jun 25, 2004, Maxim Integrated Products, Inc. 
APP 3212: Jun 25, 2004
APPLICATION NOTE 3212, AN3212, AN 3212, APP3212, Appnote3212, Appnote 3212 