MAX6948B MAXIM [Maxim Integrated Products], MAX6948B Datasheet - Page 15

• Manufacturer Part Number: MAX6948B
• Description: High-Efficiency PWM LED Driver with Boost Converter and Five Constant-Current GPIO Ports
• Manufacturer: MAXIM [Maxim Integrated Products]

The global-current register sets the full (maximum)
constant-current sink amount for I/O ports configured as
an output (Table 8). Power-up sets the global current to
its maximum value.
Set each output port’s individual constant-current sink to
either half scale or full scale of the global current. Use
the output-current registers to set the individual currents
Table 8. Global-Current Register Format (0x15)
X = Don’t care.
Converter and Five Constant-Current GPIO Ports
Table 9. Output-Current Register Format (0x13)
3.75mA full-current value (P0, P1)
1.25mA full-current value (P2, P3, P4)
7.5mA full-current value (P0, P1)
2.5mA full-current value (P2, P3, P4)
11.25mA full-current value (P0, P1)
3.75mA full-current value (P2, P3, P4)
15mA full-current value (P0, P1)
5mA full-current value (P2, P3, P4)
18.75mA full-current value (P0, P1)
6.25mA full-current value (P2, P3, P4)
22.5mA full-current value (P0, P1)
7.5mA full-current value (P2, P3, P4)
26.25mA full-current value (P0, P1)
8.75mA full-current value (P2, P3, P4)
30mA full-current value (P0, P1)
10mA full-current value (P2, P3, P4)
Power-up default
REGISTER BIT
D7, D6, D5
D4
D3
D2
D1
D0
High-Efficiency PWM LED Driver with Boost
REGISTER DESCRIPTION
Ports Configured as Outputs
DESCRIPTION
Reserved
P4
P3
P2
P1
P0
VALUE
0
0
1
0
1
0
1
0
1
0
1
—
Port P4 is set to half current
Port P4 is set to full current
Port P3 is set to half current
Port P3 is set to full current
Port P2 is set to half current
Port P2 is set to full current
Port P1 is set to half current
Port P1 is set to full current
Port P0 is set to half current
Port P0 is set to full current
(Table 9). By default, P0 and P1 start up set to full cur-
rent, while P2, P3, and P4 are set to half current.
Set each output current individually to best suit the
maximum operating current of an LED load, or adjust as
needed to double the effective intensity control range of
each output. The maximum individual current selection is
15mA (half) or 30mA (full) for ports P0 and P1, and 5mA
(half) or 10mA (full) for ports P2, P3, and P4.
D7
X
X
X
X
X
X
X
X
0
D6
X
X
X
X
X
X
X
X
0
FUNCTION
RESERVED
D5
X
X
X
X
X
X
X
X
0
REGISTER DATA
D4
X
X
X
X
X
X
X
X
0
D3
X
X
X
X
X
X
X
X
0
GLOBAL CURRENT
DEFAULT VALUE
D2
0
0
0
0
1
1
1
1
1
D1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
1
D0
0
1
0
1
0
1
0
1
1
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