LP5891 datasheet(20/69 Pages) TI

Part #	LP5891

Description	LP5891-Q1 Automotive 48 Current Sources, 64 Scans, Common Cathode LED Matrix Driver

PDF	69 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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20 / 69 page

Controller

LP5891-Q1

Step1: Send Read LOD_LINE_WARN command

Return LOD_LINE_WARN (FC16/FC17)

Step2: Send LOD_LINE_CMD (number x scan line)

Return the 48 channels LOD informa on(FC20) of number x scan line

Controller

checks FC16

and FC17,

nd the ‘1’

posi on,

suppose x.

LP5891-Q1

latches the open

detec on result

to FC20 while

scanning to

number x line

Step3: Send Read FC20 command

Figure 8-10. Steps to Read LED Open Information

8.3.5.3.3 LED Open Caterpillar Removal

Figure 8-11 shows the caterpillar issue caused by open LED. Suppose the LED0-1 is an open LED. When line 0

is chosen and the OUT1 is turned on, the OUT1 voltage is forced to approach to VLED because of the broken

path of the current source. However, the voltage of the un-chosen lines are below the Vclamp which is much

lower than VLED, causing all LEDs which connect to the channel OUT1, light unwanted.

LP5891-Q1

SNVSC61A – AUGUST 2022 – REVISED DECEMBER 2022

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LP5891 Datasheet(PDF) 20 Page - Texas Instruments