MAX6948B MAXIM [Maxim Integrated Products], MAX6948B Datasheet - Page 19

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

Figure 4. Ramp-Up Behavior
Figure 5. Hold-Off and Ramp-Down Behavior
Converter and Five Constant-Current GPIO Ports
Table 11. Port Ramp-Down Register Format (0x11)
FULL CURRENT/
HALF CURRENT
Immediately shuts down after hold-off delay
0.0655s ramp-down from full current after
hold-off delay
0.131s ramp-down from full current after
hold-off delay
0.262s ramp-down from full current after
hold-off delay
0.524s ramp-down from full current after
hold-off delay
1.049s ramp-down from full current after
hold-off delay
2.097s ramp-down from full current after
hold-off delay
REGISTER DESCRIPTION
0
High-Efficiency PWM LED Driver with Boost
1/4s 1/2s
1/8s
1/16s
ZERO TO 4s HOLD-OFF DELAY BEFORE RAMP-DOWN
FULL CURRENT/
HALF CURRENT
1s
0
2s
1/4s 1/2s
1/8s
1/16s
EXIT SHUTDOWN COMMAND
D7
RESERVED
X
X
X
X
X
X
X
ZERO TO 4s CURRENT RAMP-UP AFTER CS RUN
1s
ZERO TO 8s CURRENT RAMP-DOWN
D6
X
X
X
X
X
X
X
2s
4s
D5
X
X
X
X
X
X
X
1/4s 1/2s
1/8s
1/16s
ZERO TO 4s CURRENT RAMP-DOWN AFTER HOLD-OFF DELAY
HOLD-OFF
REGISTER DATA
D4
X
X
X
X
X
X
X
1s
D3
X
X
X
X
X
X
X
4s
2s
D2
0
0
0
0
1
1
1
RAMP-DOWN
D1
0
0
1
1
0
0
1
4s
D0
0
1
0
1
0
1
0
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