ASTi Application Note 17: RIU Digital Outputs
Application 1: Driving an LED Using RIU Digital Outputs
Note: Applies to RIU versions A and B (indicated by part number: RIU-x-A, RIU-x-B, C21x-A, C21x-B) only.
Notes
- Circuit depicted is for RIU with 4-channel option. For standard 2-channel RIU, DO2 and DO3 are not active.
- Current through each DO circuit must not exceed 50 mA. Customer must select R(lim) and LED accordingly. Assume RIU DO circuit internal resistance of 5 ohms referenced to power return.
- Distribution of voltage is application-specific, and is provided by the customer.
RIU Pinout Information
Includes both Circuit Card Header and Enclosure Connector. Typical each header or connector (Qty 2 or 4).
| Signal Description |
Circuit Card RIU Circuit Card Audio/Interface Port, typical |
Enclosure RIU Front Panel Audio/Interface Port, typical |
|---|---|---|
| Digital Output | 1 | 1 |
| Digital Input | 2 | 6 |
| Audio Out, Hi | 3 | 2 |
| Ground | 4 | 7 |
| Audio Out, Lo | 5 | 3 |
| Ground | 6 | 8 |
| Audio In, Hi | 7 | 4 |
| Ground | 8 | 9 |
| Audio In, Lo | 9 | 5 |
| n/c | 10 |
Power & Ground Connection
Connection: Solder posts
Location: Lower left corner, next to J7 header
12VDC GND available on RIU Enclosure DB9 connector
12VDC NOT available on RIU Enclosure DB9 connector
Location: Lower left corner, next to J7 header
12VDC GND available on RIU Enclosure DB9 connector
12VDC NOT available on RIU Enclosure DB9 connector
RIU with Enclosure
Audio / Interface Port, typical
Connector Type: DB9, Female
Front Panel Designation: A, B, C, D
Connector Type: DB9, Female
Front Panel Designation: A, B, C, D
Front view
RIU Circuit Card
Audio / Interface Port, typical
Connector Type: 10 position Socket Header, 0.100 inch grid
Front Panel Designation: J1, J2, J3, J4
Connector Type: 10 position Socket Header, 0.100 inch grid
Front Panel Designation: J1, J2, J3, J4
Top View
Application 2: Using an RIU DO to provide a Press-to-Talk (PTT) signal to an audio device requiring a PTT input
Note: Applies to RIU versions A and B (indicated by part number: RIU-x-A, RIU-x-B, C21x-A, C21x-B) only.
Notes
- RIU DO draws 50 mA max current. Add in-line resistor if necessary.
- Pinouts given for DB9 on RIU with enclosure and 10-pin header on circuit card.
