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Table of Contents


Power I/O Wildcard Hardware

Plugging in the Power I/O Wildcard

Selecting a Wildcard Address

Setting Outputs and Reading Inputs

Connecting High-Current Loads to the Outputs

Maximum Ratings: Current, Power and Switching Frequency

Heat Sinking

Connecting to the Inputs

Power I/O Wildcard Field Header


Hardware Schematics

Power I/O Wildcard User Guide


optically isolated high current DC outputs board

The Power I/O Wildcard provides eight high-current isolated MOSFET outputs and four high voltage isolated inputs. This tiny 2" by 2.5" module is a member of the Wildcard™ series that connects to Mosaic embedded controllers.

This document describes the capabilities of the Power I/O Wildcard, tells how to use and configure the hardware, shows how to read the inputs and write to the outputs, and presents complete schematics.

Power I/O Wildcard Hardware

The Power I/O Wildcard provides eight opto-isolated current-sinking outputs, and four opto-isolated high-voltage inputs. Jumpers enable module address selection and optional pull-up of the inputs. A Wildcard bus header connects to the host processor (e.g., QScreen or QCard Controller etc), and a field header brings out the isolated I/O signals. Table 1-1 provides specifications for the module’s inputs and outputs.

Table 1-1 Power I/O Wildcard Specifications

High Current DC Outputs
(each channel, without heat sink,TA= 0 to 70°C)
Output Channels: 8 isolated current sinking outputs with common field supply and ground
Isolation: Optically isolated to ±2500 V, 1011 Ohm isolation resistance
Output Protection Snub diodes to field supply to protect against inductive spikes
Field Voltage +1 to +50 VDC max
OFF Voltage +1 to +50 V (field supply)
OFF Leakage < 25 microA at 25° C
ON Voltage 0.6 V typical at 2 A continuously
0.3 V typical at 2 A intermittently
Max ON Resistance < 0.2 Ohm at I < 1A, typically 0.15 Ohm
< 0.3 Ohm to < 0.4 Ohm (at I = 2A for TA = 25 to 70°C)
Max ON Current 2 A continuously; or,
2 A pulses from 25 V at 50% duty cycle at frequencies to 5 kHz; or,
10 A pulse (< 50 msec on time, < 6% duty cycle at TA=25°C or < 4% duty cycle at TA= 70°C).
Switching Times ton = 9 microsec, toff = 12 microsec for 10%-90% transitions
Voltage / Switch Inputs
(each channel)
Input Channels: 4 isolated bipolar voltage or switch closure inputs, with a common field ground and optional pull-ups to a common field supply
Input High Voltage: ± 4 to ±50 VDC
Input Low Voltage < ±0.8 V
Switch Inputs Optionally pulled-up through 10kOhm to field supply
Isolation Optically isolated to ±2500 V, 1011Ohm isolation resistance

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