t

KTZ8866

January 2022 - Revision 04b

Page 31 of 37

Company Confidential

Table 18. FLAG Register

ADDRESS

MODE

RESET VALUE: 0x00

0x0F

R

BIT

NAME

POR

DESCRIPTION

7

LED_SHORT

0

0 = Normal operation

1 = LED short protection trigged.

6

TSD

0

0 = Normal operation

1 = Thermal shutdown triggered (die temperature > 150°C)

5

RSVD

0

4

RSVD

0

3

OUTP_SHORT

0

0 = Normal operation

1 = OUTP output has hit the overcurrent threshold

2

OUTN_SHORT

0

0 = Normal operation

1 = OUTN > 0.9 × VOUTN_target

1

BL_OVP

0

0 = Normal operation

1 = Backlight boost output > OVP threshold

0

BL_OCP

0

0 = Normal operation

1 = Backlight boost switch current > OCP threshold

Note:

1.

TSD is real-time results.

2.

LED_SHORT, OUTP_SHORT, OUTN_SHORT, BL_OVP and BL_OCP are latched results; OUTP_SHORT, OUTN_SHORT, BL_OVP and BL_OCP can

be reset by reading back 0x0F.

3.

All the status bits can be reset by VIN power on reset, software reset or toggling HWEN.

Table 19. BL_OPTION1 Register

ADDRESS

MODE

RESET VALUE: 0x80

0x10

R/W

BIT

NAME

POR

DESCRIPTION

7

LED_SHORT_MODE

1

0 = Will keep all strings on.

1 = Will turn off the fault string while keep health strings keep

on. (Default)

6

LED6_FB_DISABLE

0

0 = Feedback enabled (Default)

1 = Feedback disabled

5

LED5_FB_DISABLE

0

0 = Feedback enabled (Default)

1 = Feedback disabled

4

LED4_FB_DISABLE

0

0 = Feedback enabled (Default)

1 = Feedback disabled

3

LED3_FB_DISABLE

0

0 = Feedback enabled (Default)

1 = Feedback disabled

2

LED2_FB_DISABLE

0

0 = Feedback enabled (Default)

1 = Feedback disabled

1

LED1_FB_DISABLE

0

0 = Feedback enabled (Default)

1 = Feedback disabled

0

RSVD

0

Note: If all LED1~LED6 disabled, Boost stops switching.

Table 20. BL_OPTION2 Register

ADDRESS

MODE

RESET VALUE: 0x77

0x11

R/W

BIT

NAME

POR

DESCRIPTION

7:6

BL_L_SELECT

01

00 =

4.7μH

01 = 6.8

μH (Default)

10 = 10

μH

11 = 10

μH

5:4

RSVD

11

3:2

RSVD

01

1:0

BL_CURRENT_LIMIT

11

00 = 1.2A

01 = 1.6A

10 = 2.0A

11 = 2.5A (Default)