2.13 - DB15 [UE9 Datasheet]
The DB15 connector brings out 12 additional digital I/O. It has the potential to be used as an expansion bus, where the 8 EIO are data lines and the 4 CIO are control lines.
In the Windows driver, the EIO are addressed as digital I/O bits 8 through 15, and the CIO are addressed as bits 16-19.
These 12 channels include an internal series resistor that provides overvoltage/short-circuit protection. These series resistors also limit the ability of these lines to sink or source current. Refer to the specifications in Appendix A.
All digital I/O on the UE9 have 3 possible states: input, output-high, or output-low. Each bit of I/O can be configured individually. When configured as an input, a bit has a ~100 kΩ pull-up resistor to 3.3 volts. When configured as output-high, a bit is connected to the internal 3.3 volt supply (through a series resistor). When configured as output-low, a bit is connected to GND (through a series resistor).
Table 2.13-1. DB15 Connector Pinouts
DB15 Pinouts |
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1 | Vs | 9 | CIO0 |
2 | CIO1 | 10 | CIO2 |
3 | CIO3 | 11 | GND |
4 | EIO0 | 12 | EIO1 |
5 | EIO2 | 13 | EIO3 |
6 | EIO4 | 14 | EIO5 |
7 | EIO6 | 15 | EIO7 |
8 | GND |
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![](../__attachments/49677441/db15_female_2.gif?inst-v=53c3afbe-b679-4ae4-ad8c-e895cddff14e)
Figure 2.13-2. Standard DB15 pin numbers looking into the female connector on the UE9