SC5014MLTRT View Datasheet(PDF) - Semtech Corporation

Part Name

Description

MFG CO.

SC5014MLTRT

High Efficiency 4-Channel HB LED Driver with I2C Interface and Phase-Shifted PWM Dimming

Semtech Corporation 

SC5014

Definition of Registers and Bits (continued)

Dimming Duty Cycle Control Register

Bit Field

0x03 [1:0]

0x04 [7:0]

Definition Read / Write Description

D [9:0]

R/W

10-bit PWM brightness setting — This value is spread over registers: 0x03 (MSB) and 0x04

(LSB).

Dimming Frequency Select Register

Bit Field Definition Read / Write Description

0x05 [7:0] FREQ [7:0]

R/W

This register sets the LED dimming frequency.

FAST_FREQ = 1, then LED dimming frequency is equal to 10MHz / (512 x (FREQ+1)).

FAST_FREQ = 0, then LED dimming frequency is equal to 10MHz / (1024 x (FREQ+1)).

PLL Control Registers

Bit Field

0x06 [1:0]

0x07 [7:0]

0x08 [7:0]

Definition Read / Write Description

NPLL [17:0]

R/W

These registers set the PLL divider value — The system clock is intended to run at 10MHz; this

value divides the system clock down to a frequency comparable to the SYNC signal’s frequen-

cy to allow PLL synchronization. Typical values are shown below.

FIN

60 Hz

1 MHz

PLL Divider N

169,982

8

Register Values

0x02 - 0x97 - 0xFE

0x00 - 0x00 - 0x08

FPLL = (N+2) × FIN

10MHz

10MHz

Fade Options Registers

Bit Field

0x09 [7]

0x09 [6]

Definition Read / Write Description

FADE_EN R/W

Enables the fading feature.

FADE_EN = 0: No Fading; Jumps directly to new PWM value.

FADE_EN = 1: Enables fading.

FADE_TYPE R/W

Selects the fading type.

FADE_TYPE = 0: Logarithmic Fading.

FADE_TYPE = 1: Linear Fading.

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