LP5860 datasheet(21/56 Pages) TI

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CS17

–

CS1

LODVTH

CS0

Channel_lodxx Register

Channel

Control

LOD data set

to 1b

Global_LOD Bit

–

Channel

Control

–

Channel

Control

GND

Lower than threshold

for con nuously 4 mes

Comparing with

open threshold

0.25V

LODVTH

Figure 8-11. LOD Circuits

LED Short Detection

The LP5860T includes LED short detection (LSD) for the fault caused by any shorted LED. Threshold for

channel short is (VLED – 1) V typical. LED short detection only performed when PWM ≥ 25 (Mode 1 and Mode

2) or PWM ≥ 6400 (Mode 3) and voltage on CSn is detected higher than short threshold for continuously 4

sub-periods. As there is parasitic capacitance for the current sink, to make sure the LSD result is correct, setting

the LED current higher than 0.5 mA is recommended.

Figure 8-12 shows the detection circuit of LSD function. When short fault is detected, 'Global_LSD bit' in

Fault_state register is set to 1 and detailed fault state for every channel are also monitored in register Dot_lsdx

(x = 0, 1, … , 32). All short fault indicator bits can be cleared by setting LSD_clear = 0Fh after the short condition

is removed.

LSD removal function can be enabled by setting 'LSD_removal' bit in Dev_config2 register to 1. This function

turns off the upside deghosting function of the scan line where short LED is included.

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LP5860T

SNVSCE1 – MAY 2023

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