LP8552 datasheet(27/49 Pages) TI2

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LP8552

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SNVS693E – SEPTEMBER 2011 – REVISED SEPTEMBER 2014

8.6.1 Register Bit Explanations

8.6.1.1 Brightness Control

Address 00h

Reset value 0000 0000b

BRIGHTNESS CONTROL REGISTER

BRT[7:0]

Name

Bit

Access

Description

BRT

7:0

R/W

Backlight PWM 8-bit linear control.

8.6.1.2 Device Control

Address 01h

Reset value 0000 0000b

DEVICE CONTROL REGISTER

BRT_MODE[1:0]

BL_CTL

Name

Bit

Access

Description

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.

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