TPCB Cookbook
This page contains sample circuits, components, and other information for integrating various fixture accessories and instrumentation onto a TPCB.
Ingun Inductive Fixture Switch
One of our favorite accessories to integrate into an Ingun Fixture Base is an Inductive Switch. This integrates into the fixture base and can enables you to easily determine if the fixture is closed.
The sensor included in this accessory is a IFM IY5052 Inductive Sensor. This can be powered with 10-30VDC, and has a PNP Output.
To interface with this sensor, we commonly use a 3-pin terminal block. Which has the following pinout:
| Pin | TPCB Connection | Switch Wire Color |
|---|---|---|
| 1 | 12V | Brown (BN) |
| 2 | SW | Black (BK) |
| 3 | GND | Blue (BU) |
We use a voltage divider to adjust the 12V output (showing that the fixture is closed) to whatever logic level is being used by the instrumentation in the fixture.
Common connectors we've used are:
- On Shore Technology OSTVN03A150: TERM BLK 3P SIDE ENT 2.54MM PCB
- Phoenix Contact 1985205: TERM BLOCK 3POS 45DEG 3.5MM PCB
DUT Presence Switch
We commonly use a switching probe to determine if a DUT has been placed within the fixture. These probes have a plastic tip which actuates a mechanical switch when the plunger is pressed.
This probe will be inserted into a receptacle, which will have two different contacts. For example, the receptacle below has two contacts that are separated by a piece of plastic.
On the TPCB, you will need to place two separate pads, one for the receptacle to be inserted through, and an additional pad that a wire will be soldered to and then connected to the secondary contact. Here is an example.
Electrically, these probes act as a Normally Open Switch, we will typically pull one side to logic high, and then have the other side connect to a Digital IO pin with an internal pull down.