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EBX-38 Hardware Reference Manual
56
Digital and Analog I/O Paddleboards
Digital I/O (Using VL-CBR-2005A x2)
Two Microchip MCP23S17 digital I/O expander devices are used to provide thirty-two I/O lines.
The digital lines are grouped into two sets (per two devices) of 16-bit bi-directional ports. Within
each MCP23S17 device, the 16-bit I/O port functionality consists of two 8-bit ports, and can be
configured to operate in 8-bit or 16-bit mode and controlled by software. The digital I/O lines are
powered up in the input mode and make an excellent choice for industrial LVTTL interfacing.
All of the I/O pins s3.3V signaling.
The Digital I/O interface connects to two CBR-2005 (Cable and Paddleboard Assembly) via the
J21 and J26 I/O connectors.
Table 28. Digital I/O Using VL-CBR-2005A 1
12
Pin
Signal
Description
Pin
Signal
Description
1
DIO1/DIO17
Digital I/O
2
DIO2/DIO18
Digital I/O
3
DIO3/DIO19
Digital I/O
4
DIO4/DIO20
Digital I/O
5
DGND
Digital Signal
Ground
6
DIO5/DIO21
Digital I/O
7
DIO6/DIO22
Digital I/O
8
DIO7/DIO23
Digital I/O
9
DIO8/DIO24
Digital I/O
10
DGND
Digital Signal Ground
11
DIO9/DIO25
Digital I/O
12
DIO10/DIO26
Digital I/O
13
DIO11/DIO27
Digital I/O
14
DIO12/DIO28
Digital I/O
15
DGND
Digital Signal
Ground
16
DIO13/DIO29
Digital I/O
17
DIO14/DIO30
Digital I/O
18
DIO15/DIO31
Digital I/O
19
DIO16/DIO32
Digital I/O
20
DGND
Digital Signal Ground