Datasheet
Data Sheet ADPD1080/ADPD1081
Rev. B | Page 59 of 74
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] 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.
LED1
PEAK
= LED1
COARSE
× LED1
FINE
× LED1
SCALE
where:
LED1
PEAK
is the LEDX1 peak target value (mA).
LED1
COARSE
= 50.3 + 19.8 × (Register 0x23, Bits[3:0]).
LED1
FINE
= 0.74 + 0.022 × (Register 0x25, Bits[4:0]).
LED1
SCALE
= 0.1 + 0.9 × (Register 0x23, Bit 13).
0x24 [15:14] 0x0 R/W Reserved Write 0x0.
13 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)
12 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] 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.
LED2
PEAK
= LED2
COARSE
× LED2
FINE
× LED2
SCALE
where:
LED2
PEAK
is the LEDX2 peak target value (mA).
LED2
COARSE
= 50.3 + 19.8 × (Register 0x24, Bits[3:0]).
LED2
FINE
= 0.74 + 0.022 × (Register 0x25, Bits[10:6]).
LED2
SCALE
= 0.1 + 0.9 × (Register 0x24, Bit 13).
0x25 [15:11] 0xC R/W ILED3_FINE LEDX3 fine adjust. Current adjust multiplier for LED3.
LEDX3 fine adjust = 0.74 + 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 = 0.74 + 0.022 × (Register 0x25, Bits[10:6]).
See Register 0x24, Bits[3:0], for the full LED2 formula.
5 0x0 R/W Reserved Write 0x0.
[4:0] 0xC R/W ILED1_FINE LEDX1 fine adjust. Current adjust multiplier for LED1.
LEDX1 Fine Adjust = 0.74 + 0.022 × (Register 0x25, Bits[4:0]).
See Register 0x23, Bits[3:0], for the full LED1 formula.
0x30 [15:13] 0x0 R/W Reserved Write 0x0.
[12:8] 0x3 R/W SLOTA_LED_WIDTH LED pulse width (in 1 µs step) for Time Slot A.
[7:0] 0x20 R/W SLOTA_LED_OFFSET LED offset width (in 1 µs step) for Time Slot A.
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