ADPD188GG datasheet(47/61 Pages) AD

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Data Sheet

ADPD188GG

Rev. B | Page 47 of 61

Address

Data Bit

Default

Value

Access

Name

Description

[6:4]

0x0

R/W

ILED1_SLEW

LEDX1 driver slew rate control. The slower the slew rate, the safer

the performance in terms of reducing the risk of overvoltage of the

LED driver.

0: the slowest slew rate.

…

7: the fastest slew rate.

[3:0]1

0x0

R/W

ILED1_COARSE

LEDX1 coarse current setting. Coarse current sink target value of

LEDX1 in standard operation.

0x0: lowest coarse setting.

…

0xF: highest coarse setting.

LED1PEAK = LED1COARSE × LED1FINE × LED1SCALE

where:

LED1PEAK

is the LEDX1 peak target value (mA).

LED1COARSE

= 44.5 + 17.8 × (Register 0x23, Bits[3:0]).

LED1FINE = 0.73 + 0.022 × (Register 0x25, Bits[4:0]).

LED1SCALE

= 0.1 + 0.9 × (Register 0x23, Bit 13).

0x24

[15:14]

0x0

R/W

Reserved

Write 0x0.

0x1

R/W

ILED2_SCALE

LEDX2 current scale factor.

1: 100% strength.

0: 40% strength; sets the LEDX2 driver in low power mode.

LED2 Current Scale = 0.1 + 0.9 × (Register 0x24, Bit 13)

0x1

R/W

Reserved

Write 0x1.

[11:7]

0x0

R/W

Reserved

Write 0x0.

[6:4]

0x0

R/W

ILED2_SLEW

LEDX2 driver slew rate control. The slower the slew rate, the safer

the performance in terms of reducing the risk of overvoltage of the

LED driver.

0: the slowest slew rate.

…

7: the fastest slew rate.

[3:0]1

0x0

R/W

ILED2_COARSE

LEDX2 coarse current setting. Coarse current sink target value of

LEDX2 in standard operation.

0x0: lowest coarse setting.

…

0xF: highest coarse setting.

LED2PEAK = LED2COARSE × LED2FINE × LED2SCALE

where:

LED2PEAK

is the LEDX2 peak target value (mA).

LED2COARSE

= 44.5 + 17.8 × (Register 0x24, Bits[3:0]).

LED2FINE

= 0.73 + 0.022 × (Register 0x25, Bits[10:6]).

LED2SCALE

= 0.1 + 0.9 × (Register 0x24, Bit 13).

0x251

[15:11]

0xC

R/W

ILED3_FINE

LEDX3 fine adjust. Current adjust multiplier for LED3.

LEDX3 fine adjust = 0.73 + 0.022 × (Register 0x25, Bits[15:11]).

See Register 0x22, Bits[3:0], for the full LED3 formula.

[10:6]

0xC

R/W

ILED2_FINE

LEDX2 fine adjust. Current adjust multiplier for LED2.

LEDX2 fine adjust = 0.73 + 0.022 × (Register 0x25, Bits[10:6]).

See Register 0x24, Bits[3:0], for the full LED2 formula.

0x0

R/W

Reserved

Write 0x0.

[4:0]

0xC

R/W

ILED1_FINE

LEDX1 fine adjust. Current adjust multiplier for LED1.

LEDX1 Fine Adjust = 0.73 + 0.022 × (Register 0x25, Bits[4:0]).

See Register 0x23, Bits[3:0], for the full LED1 formula.

ADPD188GG Datasheet(PDF) 47 Page - Analog Devices

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