BrightSign 4K Series Hardware Manual page 14

Note: The GPIO outputs have 100
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
1 out driving 2 in
1 out driving 3 in
1 out driving 4 in
The following table illustrates the pinout of the DA15 on the 4K series of players:
pin Description
1 IR blaster input
3 Button 6 I/O
5 Button 3 I/O
7 Button 1 I/O
9 Ground
11 Ground
13 Button 2 I/O
15 Button 0 I/O
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, 2014
Ω
series resistors; the GPIO inputs have 1K pullup resistors to 3.3V; and the input
V=3.3*100/(100+1,000)=0.3
V=3.3*100/(100+500)=0.55
V=3.3*100/(100+333.3)=0.76
V=3.3*100/(100+250)=.94 (This is too high, so 1 output
driving 3 inputs is the maximum)
pin
2 Ground
4 Button 5 I/O
6 Ground
8 +3.3V output at 500mA
10 Button 7 I/O
12 Button 4 I/O
14 Ground
--
BrightSign 4K242, 4K1042, 4K1142
Description
--
11