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KTZ8866

January 2022 - Revision 04b

Page 33 of 37

Company Confidential

Table 24. PWM_UP/DOWN_RAMP Register

ADDRESS

MODE

RESET VALUE: 0xF8

0x15

R/W

BIT

NAME

POR

DESCRIPTION

7:3

IFS

11111

Backlight Full-scale LED Current ILED_FS

ILED_FS = 5.2+Code*0.8mA

11111 : 30mA (Default)

….

10100 : 21.2mA

10011 : 20.4mA

10010: 19.6mA

....

00010 : 6.8mA

00001 : 6.0mA

00000 : 5.2mA

2:0

PWM_RAMP_TIME

000

PWM Duty Cycle Transition Ramp Time

000 : 2ms (Default)

001 : 4ms

010 : 8ms

011 : 16ms

100 : 32ms

101 : 64ms

110 : 128ms

111 : 256ms

The time in the table is defined as the time to change between

0% PWM duty cycle and 100% PWM duty cycle. The final

PWM duty cycle transition time is the multiplication of the time

in the table and the difference of the PWM duty cycle change.

Note: The PWM Dimming Transition Ramp Time in the table is defined as the time to change between minimum PWM duty cycle and the maximum PWM

duty cycle. The final transition time is the multiplication of the time in the table and the change of the PWM duty cycle.