NCP5608 ON Semiconductor, NCP5608 Datasheet - Page 9

• Manufacturer Part Number: NCP5608
• Description: Multiple LED Charge Pump Driver
• Manufacturer: ON Semiconductor

when three LED only are used, one can disconnect the
LED CURRENT CONTROL REGISTERS
set of LED:
11. Reserved for future use.
12. Activates/deactivates LED4.
Table 1. Programming Table
Table 2. Internal LED Current Control Register
Internal LEDs registers
PWRLED_BK[7..0]
PWRLED_FL[7..0]
In order to improve the efficiency of the back light block
The eight LED are split in two blocks:
The programmed value of a given bank of LED is memorized into the appropriate registers. There is one register for each
The total output current is limited to 500 mA, whatever be the configuration.
Byte #1
Byte #2
Byte #2
Byte #3
Byte #3
Byte
Back Light Block:
PWRLED_BK[0..4]
LED1 to LED4, current limited to 30 mA per
LED
Stores the Back Light output current.
B7
0
0
0
1
0
B6
X
1
0
0
0
(Note 12)
(Note 11)
BLED4
B5
1
0
0
0
X
RFU
B7
B4
X
X
1
0
0
(Note 11)
RFU
B3
B6
64
X
X
0
0
0
B2
X
X
0
0
0
(Note 11)
RFU
B5
32
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B1
1
0
1
X
X
NCP5608
B0
X
X
0
1
0
9
B4
16
16
fourth LED by setting B6 = Low simultaneously with the
third byte (see Table 1).
This is the I2C address
$01 = Select the Back Light internal register
$02 = Select the Power Flash internal register
Assuming Byte #2 = $01, then:
Bits[0..4] = Back Light output current
Bit[5..6] = shall be Low
Bit[7]
Assuming Byte #2 = $02, then:
Bits[0..6] = Power Flash output current
Bit[7] = shall be Low
Bit
Flash or High Power Block:
PWRLED_FL[0..6]
B7 = 0 ³ LED 4
B7 = 1³ LED 4
= control the fourth LED in the Back Light Block:
B3
8.0
8.0
LED5 to LED8, current limited to 100 mA per
LED
Stores the Power Flash output current.
B2
4.0
4.0
th
th
connected
disconnect
Comments
2.0
2.0
B1
B0
1.0
1.0
Unit
mA
mA