NCP5608 查看數據表（PDF） - ON Semiconductor

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NCP5608

Multiple LED Charge Pump Driver

ON Semiconductor 

NCP5608

In order to improve the efficiency of the back light block

when three LED only are used, one can disconnect the

fourth LED by setting B6 = Low simultaneously with the

third byte (see Table 1).

Table 1. Programming Table

Byte

Byte #1

Byte #2

Byte #2

Byte #3

Byte #3

B7 B6 B5 B4 B3 B2 B1 B0

Comments

0

1

1

1

0

0

1

0 This is the I2C address

0

0

0

0

0

0

0

1 $01 = Select the Back Light internal register

0

0

0

0

0

0

1

0 $02 = Select the Power Flash internal register

1

0

0

X

X

X

X

X Assuming Byte #2 = $01, then:

Bits[0..4] = Back Light output current

Bit[5..6] = shall be Low

Bit[7] = control the fourth LED in the Back Light Block:

B7 = 0 ³ LED 4th disconnect

B7 = 1³ LED 4th connected

0

X

X

X

X

X

X

X Assuming Byte #2 = $02, then:

Bits[0..6] = Power Flash output current

Bit[7] = shall be Low

LED CURRENT CONTROL REGISTERS

The eight LED are split in two blocks:

Back Light Block:

Flash or High Power Block:

LED1 to LED4, current limited to 30 mA per

LED5 to LED8, current limited to 100 mA per

LED

LED

The programmed value of a given bank of LED is memorized into the appropriate registers. There is one register for each

set of LED:

PWRLED_BK[0..4]

PWRLED_FL[0..6]

Stores the Back Light output current.

Stores the Power Flash output current.

The total output current is limited to 500 mA, whatever be the configuration.

Table 2. Internal LED Current Control Register

Internal LEDs registers

Bit

Unit

B7

B6

B5

B4

B3

B2

B1

B0

PWRLED_BK[7..0]

BLED4

RFU

RFU

16

8.0

4.0

2.0

1.0

mA

(Note 12) (Note 11) (Note 11)

PWRLED_FL[7..0]

RFU

64

32

16

8.0

4.0

2.0

1.0

mA

(Note 11)

11. Reserved for future use.

12. Activates/deactivates LED4.

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