3.5.2 Opto-Isolated Outputs
The ME-5810 has 16 opto-isolated outputs (port B). In combina-
tion with a plug-on board ME-5002, further 16 opto-isolated out-
puts (port D) can be added.
The ME-5810 and ME-5002 output ports are equipped with special
driver chips that allow a selection of sink and source via software.
Depending on the application, the user can switch between low-ac-
tive outputs (sink driver = standard setting) and high-active out-
puts (source driver) via software. Moreover, the output ports can
be set to high impedance. A reference to the ground of the exter-
nal wiring via GND_EXT (pins 9, 11, 59) has to be setup in any
case.
3.5.2.1 Sink Driver
Each output is equipped with two sink driver chips of type
ULN2803, detailed specifications see page 38.
The maximum current per output (I
C
= I
Sink
) depends on the satura-
tion voltage U
CE
and is limited by the power loss of the sum of the
channels on P
tot
= 1 W per chip (DO_x 0…7 = chip 1, DO_x 8…15
= chip 2), see picture 9 and 10.
P
tot
= P
0
+ … + P
7
≤
1
W (per chip bei 70 ºC)
with P
0
= I
C0
⋅
U
CE0
