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NCP5021
Table 10. GDIMR[7..0] GRADUAL DIMMING TARGET
B7
B6
B5
B4
B3
B2
B1
B0
ms
RESET
0
0
0
0
0
0
ILED5
0
ILED4
0
ILED3
0
ILED2
0
ILED1
0
Bits [B7:B5] : Reserved for future use
Bits [B4:B0] : ILED peak current setup or Gradual Dimming Timing
The number of step for a given sequence, depends upon
the start and end output current range: since the IPEAK
value is encoded in the ILEDREG [4:0] binary scale, a
maximum of 31 steps is achievable during a gradual
dimming operation.
To select the direction of the gradual dimming (either
Upward or Downward), one shall send the appropriate
register before to activate the sequence as depicted in the
example here below:
First byte:
Second byte:
Third byte:
First byte:
Second byte:
Third byte:
= 0111 0000
= 0000 0010
= 0000 1111
= 0111 0000
= 0000 0100
= 0000 0010
3 I2C address (assuming I2CADR = Low)
3 select an ILED target UPWARD sequence
3 set I ? LED = 2.51% of the maximum range
3 I2C address (assuming I2CADR = Low)
3 set Timing and start the sequence
3 set Timing per step = 20 ms / step
Table 11. TDIM[7.0] GRADUAL DIMMING TIME PER STEP
B7
B6
B5
B4
B3
B2
B1
B0
ms
RESET
0
0
0
0
0
0
160
0
80
0
40
0
20
0
10
0
Bits [B7:B5] : Reserved for future use
Bits [B4:B0] : Gradual Dimming Timing
Figure 10. Typical Gradual Dimming UPWARD
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