User manual

Hardware Description
ComTec GmbH 3-4
3.2.4. Analog Output
A 8 bit Digital-to-Analog converter provides a software programmable analog output voltage. The
full scale output voltage range is jumper selectable between fixed +5V and screw driver
adjustable +3,5V to +7V. (Ref. Figure 3.2: MPA-3 PCI Card)
3.2.5. Power Supply
The MPA-3 PCI Card itself is powered by the 5V connectors of the PCI Slot. The MPA-3 BASE
and MPA-3 Quad ADC Port modules again are powered by the MPA-3 PCI Card through the FHS
Link. To prevent the PCI Card and the PC from damage, e.g. in case of an external shortcut,
there is a 4A mini fuse onboard (Ref. Figure 3.2: MPA-3 PCI Card).
3.2.6. FHS Link
Ref. chapter 3.3.4
3.2.7. Nonvolatile Memory
For saving card specific information there is a 256x8 bit serial EEPROM onboard. It might be
used in the future for information regarding driver upgrades, changes of PCI bus specification etc.
To prevent it from unintentional erasing or overwriting it is write protected by jumper setting. (Ref.
Figure 3.2: MPA-3 PCI Card)
DEN
i
DOUT
i
DIN
i
Digital I/O
i
Legend:
DEN
DOUT
DIN
R Pull
R I/O
= Data output driver enabl
e
= Data output driver
= Data input
= 4.7 kOhms (default)
= 100 Ohms (default)
R Pull
R I/O
Figure 3.5: Digital I/O port circuit schematic