LP8550TLX-ASLASHNOPB datasheet(27/49 Pages) TI2

27 / 49 page

LP8550

www.ti.com

SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014

DEVICE CONTROL REGISTER

BRT_MODE

2:1

R/W

PWM source mode

00b = PWM input pin duty cycle control (default)

01b = PWM input pin duty cycle control

10b = Brightness register

11b = Direct PWM control from PWM input pin

BL_CTL

R/W

Enable backlight

0 = Backlight disabled and chip turned off if BRT_MODE[1:0] = 10. In external PWM

pin control the state of the chip is defined with the PWM pin and this bit has no

effect.

1 = Backlight enabled and chip turned on if BRT_MODE[1:0] = 10. In external PWM

pin control the state of the chip is defined with the PWM pin and this bit has no

effect.

8.6.1.3 Fault

Address 02h

Reset value 0000 0000b

FAULT REGISTER

OPEN

SHORT

2_CHANNELS

1_CHANNEL

BL_FAULT

OCP

TSD

UVLO

Name

Bit

Access

Description

OPEN

LED open fault detection

0 = No fault

1 = LED open fault detected. Fault pin is pulled to GND. Fault is cleared by reading

the register 02h or setting EN pin low.

SHORT

LED short fault detection

0 = No fault

1 = LED short fault detected. Fault pin is pulled to GND. Fault is cleared by reading

the register 02h or setting EN pin low.

2_CHANNELS

LED fault detection

0 = No fault

1 = 2 or more channels have generated either short or open fault. Fault pin is pulled

to GND. Fault is cleared by reading the register 02h or setting EN pin low.

1_CHANNEL

LED fault detection

0 = No fault

1 = 1 channel has generated either short or open fault. Fault pin is pulled to GND.

Fault is cleared by reading the register 02h or setting EN pin low.

BL_FAULT

LED fault detection

0 = No fault

1 = LED fault detected. Generated with OR function of all LED faults. Fault pin is

pulled to GND. Fault is cleared by reading the register 02h or setting EN pin low.

OCP

Overcurrent protection

0 = No fault

1 = Overcurrent detected in boost output. OCP detection block monitors the boost

output and if the boost output has been too low for more than 50 ms it generates an

OCP fault and disable the boost. Fault pin is pulled to GND. Fault is cleared by

reading the register 02h or setting EN pin low. After clearing the fault boost starts up

again.

TSD

Thermal shutdown

0 = No fault

1 = Thermal fault generated, 150°C reached. Boost converted and LED outputs are

disabled until the temperature has dropped down to 130°C. Fault pin is pulled to

GND. Fault is cleared by reading the register 02h or setting EN pin low.

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