CS1630 Datasheet, PDF(29/56 Page) Cirrus Logic – 2-Channel TRIAC Dimmable LED Driver IC

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CS1630 Datasheet, PDF (29/56 Pages) Cirrus Logic – 2-Channel TRIAC Dimmable LED Driver IC

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CS1630/31

6.2 Configuration 0 (Config0) â Address 0

MODE

LOCKOUT

Number

[ 7:2 ]

[1]

[0]

Name

MODE

LOCKOUT

Description

Reserved

Appends two of the color system coefficients (P01 followed by P10) to the 32-

bit lockout key to make it a 64-bit key from a 32-bit key to increase security.

0 = 32-bit key

1 = 64-bit key

Configures the IC lockout security mechanism by using Lockout Key.

0 = Disable

1 = Enable

6.3 Lockout Key (LOCK0, LOCK1, LOCK2, LOCK3) â Address 1 - 4

MSB 30 29 28 27 26 25 24 .....

1 LSB

231

230

229

228

227

226

225

224

.....

Lockout Key is a 32-bit long-word used for password protection when accessing the OTP registers. Register

LOCK0 is the least significant byte of the Lockout Key, and register LOCK3 is the most significant byte of

Lockout Key. Register LOCK2 is the byte to the right of LOCK3, and register LOCK1 is the byte to the left of

LOCK0. To access the OTP registers on an IC with a lockout mechanism that has been enabled, see âCus-

tomer I2C Lockoutâ on page 25.

6.4 Color Polynomial Coefficient (P30, P20, P10, P03, P02, P01, P21, P12, P11, P00) â Address 5 - 24

MSB 14 13 12 11 10

1 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

Color polynomial coefficients used to calculate the gain (GAINDTR) that controls the current in the color LED

channel based on temperature drift and current dim level. The value is a two's complement number in the

range of -8.0ï£value<8.0, with the binary point to the right of bit 12. The gain polynomial is:

GAINDTR = P30 ï T3 + P20 ï T2 + P10 ï T + P03 ï D3 + P02 ï D2 + P01 ï D + P21 ï T2 ï D + P12 ï T ï D2 + P11 ï T ï D + P00

where,

T = the measured normalized temperature and is 0ï£T<1.0

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

GAINDTR = gain of the channel based on the temperature measurement and the dim value. The polynomial

coefficients should be selected such that the computed GAINDTR is always a positive number in the range

of 0<GAINDTR<4.

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

LSB is the least significant byte.

DS954F2

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