BrightSign LS322 Hardware User Manual

Page 10

LS322, LS422 User Manual and Operations Guide

All information provided in this reference manual applies to products under development. The characteristics and specifications of these products are subject to

change without notice. BrightSign assumes no obligation regarding future manufacturing unless otherwise agreed to in writing. © BrightSign LLC, 2015

If one BrightSign player is driving the inputs on another BrightSign player, then you can drive at most three inputs from
one output. The following calculations explain this limitation:

Note: The GPIO outputs have 100

Ω

series resistors; the GPIO inputs have 1K pullup resistors to 3.3V; and the input

threshold on the 541 chips is 2V high and .8V low. The high voltage is not problematic, but the low voltage can be if there
are too many inputs connected to one output.

1 out driving 1 in

V=3.3*100/(100+1,000)=0.3

1 out driving 2 in

V=3.3*100/(100+500)=0.55

1 out driving 3 in

V=3.3*100/(100+333.3)=0.76

1 out driving 4 in

V=3.3*100/(100+250)=.94 (This is too high, so the
maximum is one output driving three inputs)

The following table illustrates the pinout of the DA15 on LS players:

Description

1 IR blaster input

2 Ground

3 Button 6 I/O

4 Button 5 I/O

5 Button 3 I/O

6 Ground

7 Button 1 I/O

8 +3.3V output at 500mA

9 Ground

10 Button 7 I/O

11 Ground

12 Button 4 I/O

13 Button 2 I/O

14 Ground

15 Button 0 I/O

Here is the DA15 female connector as viewed from the front:

This manual is related to the following products:

LS422 Hardware