Table of Contents
4. Interface
4.1 General Considerations
- The host connector and IOL connectors are 2,54mm pitch pin header with a pin length of 6mm.
- The clearance under the board shall be min. H=3,5mm.
4.2 Power Supply
- The 24V power supply voltage shall be 24V +/- 20%.
- The host connector shall be able to provide 2A on the 24V supply.
- The voltage is filtered to provide EMC compatibility on the IOL ports when integrated.
Please note that the 24V voltage supply is not reverse polarity protected.
4.3 Host Connector X1
- The Vdd provides a reference level for the logic communication (SPI, IRQ) and supply for the µC on the module (IOL Core4 µC only)
- The Vdd voltage is 3,3V +/- 10%. The maximum current on this line is:
- IOL Core4 (PT-1204) <20mA.
- IOL Core4 µC (PT-1205) <75mA.
- The logic communication lines (SPI, IRQ) do not include ESD protection in order to preserve signal integrity. This needs to be considered on the host if the lines are ESD-exposed.
Pin assignment:
| Pin | Signal |
|---|---|
| 1,2 | 24V IN |
| 3,4 | GND |
| 5 | Vdd, logic reference (3.2V) |
| 6 | SPI CLK (logic level) |
| 7 | SPI MOSI (logic level) |
| 8 | SPI MISO (logic level) |
| 9 | IRQ1 (logic level) to MAX1 – has an internal pull-up |
| 10 | CS1 (logic level) to MAX1 |
| 11 | IRQ2 (logic level) to MAX2 – has an internal pull-up |
| 12 | CS2 (logic level) to MAX2 |
Host connector X1 TOP view:
All logic signals (SPI, interrupts) host interface X1 work on 3V3 logic levels.
4.4 IOL Connector
Pin assignment:
| Pin | Port | Signal |
|---|---|---|
| 1 | Port 1 (IOL1A) | L+ |
| 2 | Port 2 (IOL1B) | L+ |
| 3 | Port 1 (IOL1A) | DIA |
| 4 | Port 2 (IOL1B) | DIA |
| 5 | Port 1 (IOL1A) | CQB |
| 6 | Port 2 (IOL1B) | CQB |
| 7 | Port 3 (IOL2A) | L+ |
| 8 | Port 4 (IOL2B) | L+ |
| 9 | Port 3 (IOL2A) | DIA |
| 10 | Port 4 (IOL2B) | DIA |
| 11 | Port 3 (IOL2A) | CQB |
| 12 | Port 4 (IOL2B) | CQB |
| 13,14 | Common | GND |
IOL connector X2 TOP view:
Each SDCI Port is designed to supply max. 500mA on the L+ line and 150mA on the CQ line. The current supply is limited by software (for L+ in connection with a series resistor). If a custom master application is used, the limits must be set in the driver configuration.