LP5891 datasheet(13/74 Pages) TI

13 / 74 page

7.3 Feature Description

7.3.1 Independent and Stackable Mode

The LP5891 can operate in two different modes: independent or stackable. In independent mode, a single

LP5891 can drive a 16 × 16 RGB LED matrix, while in stackable mode, up to four LP5891 devices can be

stacked together, which means the line switches of one device can be shared to the others. Stacking three

LP5891 devices can drive a 48 × 48 RGB LED matrix while stacking four LP5891 devices can drive a 64 × 64

RGB matrix. The mode can be configured by the MOD_SIZE (see FC2 for more details).

7.3.1.1 Independent Mode

Figure 7-1 shows an implementation of a 16 × 32 RGB LED matrix using two LP5891 devices in independent

mode. Each device is responsible for its own 16 ×16 RGB LED matrix, which means that all the data for section

A is stored in device 1 and the data for section B is stored in device 2.

Figure 7-1. Two Devices in Independent Mode

The unused line must be assigned to the last several lines of the device. For example, if there are only 14

scanning lines, then the two unused lines must be assigned to 1_LS14 and 1_LS15.

7.3.1.2 Stackable Mode

While operating the LP5891 in stackable mode, as shown in below table.

Table 7-1. Stackable Mode

Mode

Matrix Size

Scan Sequence

Mode1

16x32

000b

D1, D2 independent

Mode2

32x32

001b

D1->D2

Mode3

48x48

010b

D1->D2->D3

Mode4

48x48

011b

D1->D3->D2

Mode5

48x64

100b

D1->D2->D3

Mode6

48x64

101b

D1->D3->D2

Mode7

64x64

110b

D1->D2->D3->D4

Mode8

64x64

111b

D1->D4->D2->D3

Figure 7-2 device 2 needs to be rotated 180o relative to device 1. This action allows the position of line switches

to be near the center column of the LED matrix for better routing. For device 1, the lines connect sequentially

(line switch 0 connected to scan line 1). However on device 2, it is connected in reverse order, with the 16th scan

line is connected to line switch 15 and the 32nd scan line is connected to line switch 0.

Figure 7-2 shows the connection between two LP5891 devices in stackable mode driving 32 × 32 RGB LED

pixels. The MOD_SIZE must be configured to 001b. Device 1 supplies 16 line switches for the first 16 scan line,

and device 2 supplies 16 line switches for scan line 17-32. The data for matrix sections A and C are stored in

device 1, while matrix sections B and D data are stored in device 2.

To make sure the scanning sequence is still from 1st line to 32nd line, the scan line switching order of the second

device must be reversed, which can be configured by the SCAN_REV (see FC4 for more details).

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LP5891

SLDS269A – MARCH 2022 – REVISED MAY 2022

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