TPMC671 User Manual Issue 1.1
Page 7 of 28
3 Functional Description
3.1 Digital Outputs
3.1.1 Optical
Isolation
The TPMC671 has 16 high side switch (TPMC671-10/20) or 16 low side switch (TPMC671-11/21)
digital outputs. The standard signal level for these outputs is 24V DC. All outputs are isolated by
optocouplers from the computer system and are also isolated against each other in groups of four
outputs.
GROUP
VS / standard 24V DC
GROUND
OUTPUT
O1 VS_O1
GND_O1
OUT
1
OUT 2
OUT 3
OUT 4
O2 VS_O
GND_O2
OUT
5
OUT 6
OUT 7
OUT 8
O3 VS_O3
GND_O3
OUT
9
OUT 10
OUT 11
OUT 12
O4 VS_O4
GND_O4
OUT
13
OUT 14
OUT 15
OUT 16
Figure 3-1 : Isolated Digital Outputs
3.1.2 Output
Polarity
Each output can be individually switched to the according power supply VS_Ox (high side switch) or
GND_Ox (low side switch).
3.1.3 Overload
Protection
The output drivers used on the TPMC671 are smart drivers TDE1707. The maximum continuous
output current is 0.5A. The output circuits are protected against overload, short circuit and over
temperature. In case of such a failure the corresponding output is switched off until the error condition
is removed. Then the output returns automatically to normal operation and the state programmed in
the Data Output Register.
For details about the protection of the TDE1707 please refer to the data sheet which is part of the
TPMC671-ED Engineering Documentation.
