CS1630-FSZ datasheet(30/56 Pages) APEX

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CS1630/31

DS954F2

6.5 Color Polynomial Coefficient (Q3, Q2, Q1, Q0) – Address 25 - 32

Coefficients of the color polynomial used to calculate the gain (GAINDR) that controls the current in the white

LED channel based on the current dim level. The value is a two's complement number in the range of

-8.0

value<8.0, with the binary point to the right of bit 12. Coefficients Q3, Q2, Q1, and Q0 are distributed in

the gain polynomial:

where,

D = the normalized dim value and is 0<D<1.0

GAINDR = gain of the channel based on the dim value. The polynomial coefficients should be selected such

that the computed GAINDR is always a positive number such that 0<GAINDR<4.

Color Polynomial Coefficients, Qxx, are 16-bits in length where Qxx - MSB is the most significant byte and

Qxx-LSB is the least significant byte.

6.6 Gate Drive Duration (GD_DUR) – Address 33

GD_DUR sets the maximum gate drive duration for the second stage (flyback, buck, or tapped buck). The reg-

ister value is an unsigned integer in the range of 0

value255. The maximum gate drive duration is determined

by:

The maximum gate drive duration can be configured from 350ns to 102.35

s.

MSB

987654321

LSB

-(23)22

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

2-10

2-11

2-12

654

GAINDR

 3

3 



Q2 D



Q1 D



GD_DUR 8



 7

 50



CS1630-FSZ 数据表(PDF) 30 Page - Cirrus Logic

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