Max6948b – Rainbow Electronics MAX6948B User Manual
Page 20
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
20
MAX6948B
Table 11. Port Ramp-Down Register Format (0x11) (continued)
X = Don’t care.
Table 12. Port Ramp-Up Register Format (0x12)
X = Don’t care.
REGISTER DESCRIPTION
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
RESERVED
HOLD-OFF
RAMP-DOWN
4.164s ramp-down from full current after
ramp-down delay
X
X
X
X
X
1
1
1
Zero ramp-down delay before fade-off
X
X
0
0
0
X
X
X
0.0655s ramp-down delay before fade-off
X
X
0
0
1
X
X
X
0.131s ramp-down delay before fade-off
X
X
0
1
0
X
X
X
0.262s ramp-down delay before fade-off
X
X
0
1
1
X
X
X
0.524s ramp-down delay before fade-off
X
X
1
0
0
X
X
X
1.049s ramp-down delay before fade-off
X
X
1
0
1
X
X
X
2.097s ramp-down delay before fade-off
X
X
1
1
0
X
X
X
4.164s ramp-down delay before fade-off
X
X
1
1
1
X
X
X
Power-up default
0
0
0
0
0
0
0
0
REGISTER DESCRIPTION
REGISTER DATA
D7
D6
D5
D4
D3
D2
D1
D0
RESERVED
RAMP-UP
Immediately starts up
X
X
X
X
X
0
0
0
0.0655s ramp-up to full current
X
X
X
X
X
0
0
1
0.131s ramp-up to full current
X
X
X
X
X
0
1
0
0.262s ramp-up to full current
X
X
X
X
X
0
1
1
0.524s ramp-up to full current
X
X
X
X
X
1
0
0
1.049s ramp-up to full current
X
X
X
X
X
1
0
1
2.097s ramp-up to full current
X
X
X
X
X
1
1
0
4.164s ramp-up to full current
X
X
X
X
X
1
1
1
Power-up default
0
0
0
0
0
0
0
0