Datasheet

*Do NOT write to register.
REGISTER
ADDRESS (COMMAND BYTE)
HEX CODE
D15 D14 D13 D12 D11 D10 D9 D8
No-Op R/W 0 0 0 0 0 0 0 0x00
Decode Mode R/W 0 0 0 0 0 0 1 0x01
Global Intensity R/W 0 0 0 0 0 1 0 0x02
Scan Limit R/W 0 0 0 0 0 1 1 0x03
Configuration R/W 0 0 0 0 1 0 0 0x04
GPIO Data R/W 0 0 0 0 1 0 1 0x05
Port Configuration R/W 0 0 0 0 1 1 0 0x06
Display Test R/W 0 0 0 0 1 1 1 0x07
Write KEY_A Mask
Read KEY_A Debounce
R/W 0 0 0 1 0 0 0 0x08
Write KEY_B Mask
Read KEY_B Debounce
R/W 0 0 0 1 0 0 1 0x09
Write KEY_C Mask
Read KEY_C Debounce
R/W 0 0 0 1 0 1 0 0x0A
Write KEY_D Mask
Read KEY_D Debounce
R/W 0 0 0 1 0 1 1 0x0B
Write Digit Type
Read KEY_A Pressed
R/W 0 0 0 1 1 0 0 0x0C
Read KEY_B Pressed* 1 0 0 0 1 1 0 1 0x0D
Read KEY_C Pressed* 1 0 0 0 1 1 1 0 0x0E
Read KEY_D Pressed* 1 0 0 0 1 1 1 1 0x0F
Intensity 10 R/W 0 0 1 0 0 0 0 0x10
Intensity 32 R/W 0 0 1 0 0 0 1 0x11
Intensity 54 R/W 0 0 1 0 0 1 0 0x12
Intensity 76 R/W 0 0 1 0 0 1 1 0x13
Intensity 10a (7 Segment Only) R/W 0 0 1 0 1 0 0 0x14
Intensity 32a (7 Segment Only) R/W 0 0 1 0 1 0 1 0x15
Intensity 54a (7 Segment Only) R/W 0 0 1 0 1 1 0 0x16
Intensity 76a (7 Segment Only) R/W 0 0 1 0 1 1 1 0x17
Digit 0 Plane P0 R/W 0 1 0 0 0 0 0 0x20
Digit 1 Plane P0 R/W 0 1 0 0 0 0 1 0x21
Digit 2 Plane P0 R/W 0 1 0 0 0 1 0 0x22
Digit 3 Plane P0 R/W 0 1 0 0 0 1 1 0x23
Digit 4 Plane P0 R/W 0 1 0 0 1 0 0 0x24
Digit 5 Plane P0 R/W 0 1 0 0 1 0 1 0x25
Digit 6 Plane P0 R/W 0 1 0 0 1 1 0 0x26
Digit 7 Plane P0 R/W 0 1 0 0 1 1 1 0x27
Digit 0a Plane P0 (7 Segment Only) R/W 0 1 0 1 0 0 0 0x28
Digit 1a Plane P0 (7 Segment Only) R/W 0 1 0 1 0 0 1 0x29
Digit 2a Plane P0 (7 Segment Only) R/W 0 1 0 1 0 1 0 0x2A
Digit 3a Plane P0 (7 Segment Only) R/W 0 1 0 1 0 1 1 0x2B
www.maximintegrated.com
Maxim Integrated │ 13
MAX6954 4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Table 6. Register Address Map