LP8550TLESLASHNOPB.A datasheet(33/49 Pages) TI2

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LP8550

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SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014

EEPROM ADDRESS 3 REGISTER

PWM_FREQ

4:0

R/W

PWM output frequency setting. See PWM Frequency Setting for full

description of selectable PWM frequencies.

8.6.2.6 EEPROM Address 4

Address A4h

EEPROM ADDRESS 4 REGISTER

PWM_RESOLUTION[1:0]

EN_I_RES

LED_FAULT_THR

I_SLOPE[0]

DRV_HEADR[2:0]

Name

Bit

Access

Description

PWM

7:6

R/W

PWM output resolution selection. Actual resolution depends also on the output

RESOLUTION

frequency. See PWM Frequency Setting for full description.

00 = 8...10 bits (19.2 kHz...4.8 kHz)

01 = 9...11 bits (19.2 kHz... 4.8 kHz)

10 = 10...12 bits (19.2 kHz...4.8 kHz)

11 = 11...13 bits (19.2 kHz...4.8 kHz)

EN_I_RES

R/W

Enable LED current set resistor

0 = Resistor is disabled and current is set only with CURRENT EEPROM register bits

1 = Enable LED current set resistor. LED current is defined by the RISET resistor and the

CURRENT EEPROM register bits.

LED_FAULT_T

R/W

LED fault detector thresholds. VSAT is the saturation voltage of the driver, typically 200

mV.

0 = 3.3V

1 = 5.3V

I_SLOPE[0]

R/W

DRV_HEADR

2:0

R/W

LED output driver headroom control. VSAT is the saturation voltage of the driver, typically

200 mV.

000 = VSAT + 125 mV

001 = VSAT + 250 mV

010 = VSAT + 375 mV

011 = VSAT + 500 mV

100 = VSAT + 625 mV

101 = VSAT + 750 mV

110 = VSAT + 875 mV

111 = VSAT + 1000 mV

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