MAX6955 Datasheet, PDF (26/39 Pages) Maxim Integrated Products – 2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan

2-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Table 17. Configuration Register Format
MODE
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
Configuration
Register
P
I
R
T
EBX
S
Table 18. Shutdown Control (S Data Bit DO)
Format
MODE
Shutdown
Normal
Operation
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
P I RTEBX 0
P I RTEBX 1
Table 19. Blink Rate Selection (B Data Bit D2) Format
MODE
Slow blinking. Segments blink on for 1s, off for 1s with f_OSC = 4MHz.
Fast blinking. Segments blink on for 0.5s, off for 0.5s with f_OSC = 4MHz.
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
P I RTE0XS
P I RTE1XS
Table 20. Global Blink Enable/Disable (E Data Bit D3) Format
MODE
Blink function is disabled.
Blink function is enabled.
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
P
I
R
T
0
B
X
S
P
I
R
T
1
B
X
S
Table 21. Digit Register Mapping with Blink Globally Enabled
SEGMENT’S BIT SETTING
IN PLANE P1
0
0
1
1
SEGMENT’S BIT SETTING
IN PLANE P0
0
1
0
1
SEGMENT
BEHAVIOR
Segment off.
Segment on only during the 1st half of each
blink period.
Segment on only during the 2nd half of each
blink period.
Segment on.
Table 22. Global Blink Timing Synchronization (T Data Bit D4) Format
MODE
Blink timing counters are unaffected.
Blink timing counters are reset during the I²C acknowledge.
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
P
I
R
0
E
B
X
S
P
I
R
1
E
B
X
S
Table 23. Global Clear Digit Data (R Data Bit D5) Format
MODE
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
Digit data for both planes P0 and P1 are unaffected.
P
I
0
T
E
BX
S
Digit data for both planes P0 and P1 are cleared during the I²C acknowledge. P
I
1
T
E
BX
S
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