Datasheet

X = Don’t care bit.
Table 9. Global Segment Current Register Format
X = Don’t care bit.
Table 8. Transition Detection Control (M-Data Bit D7) Format
X = Don’t care bit.
Table 7. Global Current Control (I Data Bit D6) Format
X = Don’t care bit.
Table 6. Shutdown Control (S Data Bit D0) Format
X = Don’t care bit.
Table 5. Configuration Register Format
LED DRIVE
FRACTION
TYPICAL SEGMENT
CURRENT (mA)
ADDRESS CODE
(HEX)
D7 D6 D5 D4 D3 D2 D1 D0 HEX CODE
1/16 1.5 0x02 X X X X 0 0 0 0 0xX0
2/16 3 0x02 X X X X 0 0 0 1 0xX1
3/16 4.5 0x02 X X X X 0 0 1 0 0xX2
4/16 6 0x02 X X X X 0 0 1 1 0xX3
5/16 7.5 0x02 X X X X 0 1 0 0 0xX4
FUNCTION
ADDRESS CODE
(HEX)
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
Disabled 0x04 0 I X X X X X S
Enabled 0x04 1 I X X X X X S
FUNCTION
ADDRESS
CODE (HEX)
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
Global
Constant-current limits for all digits are controlled
by one setting in the Global Current register,
0x02
0x04 M 0 X X X X X S
Individual Segment
Constant-current limit for each digit is individually
controlled by the settings in the Current054
through Current1FE registers
0x04 M 1 X X X X X S
FUNCTION
ADDRESS CODE
(HEX)
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
Shutdown 0x04 M I X X X X X 0
Normal Operation 0x04 M I X X X X X 1
FUNCTION
ADDRESS CODE
(HEX)
REGISTER DATA
D7 D6 D5 D4 D3 D2 D1 D0
Configuration Register 0x04 M 0 X X X X X S
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MAX6957 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
28-Port LED Display Driver and I/O Expander