NCP5623 데이터 시트보기 (PDF) - ON Semiconductor
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NCP5623 Datasheet PDF : 10 Pages
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NCP5623
Table 2. Basic Programming Sequences
I2C Address COMMAND Bits[7:0]
Operation
$70
000X XXXX
System Shut Down
$70
0010 0000
Set Up the ILED current
0011 1111
$70
0100 0000
Set Up the RED PWM
0101 1111
$70
0110 0000
Set Up the GREEN PWM
0111 1111
$70
1000 0000
Set Up the BLUE PWM
1001 1111
$70
1010 0000
Set Up the IEND Upward
1011 1111
$70
1100 0000
Set Up the IEND Downward
1101 1111
$70
1110 0001
Set Up the Gradual Dimming
1111 1111
time and run the sequence
Note
Bits[4:0] are irrelevant
ILED register
Bits[4:0] contain the ILED value as defined by the IREF value
REDPWM
Bits[4:0] contain the PWM value
GREENPWM
Bits[4:0] contain the PWM value
BLUEPWM
Bits[4:0] contain the PWM value
UPWARD
Bits[4:0] contain the IEND value
DWNWRD
Bits[4:0] contain the IEND value
GRAD
Bits[4:0] contain the TIME value
The number of step for a given sequence, depends upon
the start and end output current range: since the ILED value
is encoded in the Bits[4:0] binary scale, a maximum of 31
steps is achievable during a gradual dimming operation.
The number of steps will be automatically recalculated by
the chip according to the equation:
Nstep = | existing step position − new step position |
As an example, assuming the previously programmed
step was 5 and the new one is 15, then we will have 10 steps
to run between the actual location to the end value. If the
timing was set at 16 ms, the total gradual dimming sequence
will be 160 ms.
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 below:
1010 1111 ³ 1110 0011 ³ select an UPWARD sequence
with 24 ms/step, the end ILED current being
(IREF*2400)/(31−15)
1100 0001 ³ 1110 0100 ³ select the DOWNWARD
sequence with 32 ms/step, the end ILED current being
(IREF*2400)/(31−1).
Table 3. Output Current Programmed Value (ILED = F(Step))
Step
ILED (mA)
Step
ILED (mA)
Step
0 / $00
0
9 / $09
1.25
18 / $12
1 / $01
0.92
10 / $0A
1.31
19 / $13
2 / $02
0.95
11 / $0B
1.38
20 / $14
3 / $03
0.98
12 / $0C
1.45
21 / $15
4 / $04
1.02
13 / $0D
1.53
22 / $16
5 / $05
1.06
14 / $0E
1.62
23 / $17
6 / $06
1.10
15 / $0F
1.72
24 / $18
7 / $07
1.15
16 / $10
1.84
25 / $19
8 / $08
1.20
17 / $11
1.97
26 / $1A
NOTE: The table assumes IREF = 11.5 mA
ILED (mA)
2.12
2.30
2.50
2.76
3.06
3.45
3.94
4.60
5.52
Step
27 $1B
28 / $1C
29 / $1D
30 / $1E
31 / $1F
ILED (mA)
6.90
9.20
13.80
27.60
27.60
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