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MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
Output Current Registers
Each output port’s individual constant-current sink can
be set to be either half or full global current. The indi-
vidual currents are set by the output current registers
( Table 7). The global current is set by the global current
register ( Table 8).
Table 7. Output Current Register Format
Each output current can be set individually to best suit
the maximum operating current of an LED load, or even
adjusted on the fly to double the effective intensity con-
trol range of each output. When the global current reg-
ister is set to maximum, the individual current selection
is 10mA (half) or 20mA (full).
REGISTER
R/W
ADDRESS
CODE (HEX)
D7
D6
D5
REGISTER DATA
D4 D3
D2
D1
D0
OUTPUT CURRENT IOUT70
Output P0 is set to half constant current
Output P0 is set to full constant current
Output P1 is set to half constant current
Output P1 is set to full constant current
Output P2 is set to half constant current
Output P2 is set to full constant current
X
X
X
X
X
X
X
IOUT
7
X
X
X
X
X
X
IOUT
6
X
X
X
X
X
X
IOUT
5
X
X
X
X
X
X
IOUT
4
X
X
X
X
X
X
IOUT
3
X
X
X
X
X
X
IOUT
2
X
X
X
X
0
1
IOUT
1
X
X
0
1
X
X
IOUT
0
0
1
X
X
X
X
Output P3 is set to half constant current
Output P3 is set to full constant current
Output P4 is set to half constant current
Output P4 is set to full constant current
Output P5 is set to half constant current
Output P5 is set to full constant current
Output P6 is set to half constant current
Output P6 is set to full constant current
Output P7 is set to half constant current
Output P7 is set to full constant current
X
X
X
X
X
X
X
X
X
X
0x13
X
X
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
X
X
X
X
X
X
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
OUTPUT CURRENT IOUT98
0
1
X
0
X
0
X
0
X
0
X
0
X
0
IOUT9 IOUT8
IOUT9 IOUT8
Output P8 is set to half constant current
Output P8 is set to full constant current
Output P9 is set to half constant current
Output P9 is set to full constant current
X
X
X
X
0x14
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
1
0
1
X
X
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