TLC5970
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SBVS140 –MARCH 2010
Equation 2 determines each output (OUTn) sink current:
DCn
BC
IOUTn (mA) = IOLCMax (mA) ´
´
127d
127d
Where:
IOLCMax = the maximum channel current for each channel determined by RIREFn
DCn = the decimal dot correction value for each OUTn in the DC latch (DCn = 0d to 127d)
BC = the decimal brightness control value in the brightness control latch (BC = 0d to 127d)
(2)
DC, BC, and function current control data are shown in Table 2, Table 3, and Table 4, respectively.
Table 2. DC Data versus Current Ratio and Set Current Value
SET CURRENT
RATIO TO
DC DATA
(Binary)
DC DATA
(Decimal)
DC DATA
(Hex)
BC DATA
(Hex)
MAXIMUM
CURRENT (%)
150 mA IOLCMax
(mA, Typical)
10 mA IOLCMax
(mA, Typical)
000 0000
000 0001
000 0010
—
0
1
00
01
02
—
7F
7F
7F
—
0
0.8
0
0
1.18
0.08
0.16
—
2
1.6
2.36
—
—
—
111 1101
111 1110
111 1111
125
126
127
7D
7E
7F
7F
7F
7F
98.4
99.2
100.0
147.64
148.82
150.00
9.84
9.92
10.00
Table 3. BC Data versus Current Ratio and Set Current Value
SET CURRENT
RATIO TO
BC DATA
(Binary)
BC DATA
(Decimal)
BC DATA
(Hex)
DC DATA
(Hex)
MAXIMUM
CURRENT (%)
150 mA IOLCMax
(mA, Typical)
10 mA IOLCMax
(mA, Typical)
000 0000
000 0001
000 0010
—
0
1
00
01
02
—
7F
7F
7F
—
0
0.8
0
0
1.18
0.08
0.16
—
2
1.6
2.36
—
—
—
111 1101
111 1110
111 1111
125
126
127
7D
7E
7F
7F
7F
7F
98.4
99.2
100.0
147.64
148.82
150.00
9.84
9.92
10.00
Table 4. DC and BC Data versus Current Ratio and Set Current Value
SET CURRENT RATIO
BC DATA
(Hex)
DC DATA
(Hex)
TO MAXIMUM CURRENT
(%)
150 mA IOLCMax
(mA, Typical)
10 mA IOLCMax
(mA, Typical)
00
00
01
02
—
0
0
0
0
01
0
0.01
02
0.01
—
0.04
0
—
—
—
7D
7E
7F
7D
7E
7F
96.88
98.43
100.0
145.31
147.65
150.00
9.69
9.84
10.00
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