IOCAN

# Technical Specifications

This page describes the hardware and electrical characteristics of the IOcan CAN

gateway. Higher-level protocol support, transmission-specific behaviour, and

configuration details are documented on separate pages. For connector pin

assignments, see [[CAN Gateway Pinout]].

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## Power Supply

| Parameter                               | Value                      |

| --------------------------------------- | -------------------------- |

| Recommended nominal operating voltage   | 14.4 V                     |

| Absolute maximum supply voltage         | 18 V                       |

| Maximum system current                  | < 20 A                     |

| Internal fuse rating                    | 30 A                       |

| Recommended external vehicle fuse       | 30 A                       |

| Reverse-polarity protection             | Yes                        |

| Wake-up voltage threshold               | 4.5 V ± 0.3 V              |

| Standby current (KL30 only, KL15 off)   | < 0.5 mA                   |

| Active operating current                | Depends on connected loads |

The device is designed for permanent battery connection via fuse. Transmission

power sequencing and wake-up behaviour are managed internally. In USB-only mode

the device logic can be powered for configuration without vehicle power, and the

transmission power output remains disabled.

## CAN Interfaces

| Parameter                  | Value                                  |

| -------------------------- | -------------------------------------- |

| Number of interfaces       | 4 (independent)                        |

| CAN FD transceiver         | Microchip MCP2558FD                    |

| Supported standards        | Classical CAN 2.0A / 2.0B, CAN FD      |

| Classical CAN bitrate      | up to 1 Mbps                           |

| CAN FD data-phase bitrate  | up to 8 Mbps                           |

| Bitrate selection          | Fully configurable                     |

| Termination                | Switchable 120 Ω on each network       |

| Physical interface         | Differential pair per network (CANxH / CANxL) |

## USB Interface

| Parameter                 | Value                                          |

| ------------------------- | ---------------------------------------------- |

| Connector                 | USB-C                                          |

| Speed                     | 480 Mbps (USB 2.0 High Speed)                  |

| Functions                 | Configuration, firmware updates, diagnostics, datalogging |

| Bus-powered configuration | Device logic can run from USB without vehicle power |

| CAN data access           | candump-compatible CAN output over USB         |

| Software                  | Dedicated IOcan configuration tool             |

## Analog Inputs

IOcan provides 11 analog inputs using resistor dividers that allow measurement of

automotive voltage ranges while protecting the internal ADC.

| Group              | Channels | Typical range | Maximum measurable |

| ------------------ | -------- | ------------- | ------------------ |

| AN1–AN7 (0–12 V)   | 7        | 0–12 V        | 16 V               |

| AN8–AN11 (0–5 V)   | 4        | 0–5 V         | 6 V                |

Selected channels also support additional operating modes:

* digital input mode

* analog-switch / resistor-ladder mode (several buttons on one pin)

* frequency input mode

Typical applications: ignition and switch signals, digital signals from ECUs,

throttle-position sensors, pressure sensors, and position sensors. See

[[Configuration Concepts]] for how inputs are assigned and scaled.

## Frequency Inputs

| Parameter        | Value                                  |

| ---------------- | -------------------------------------- |

| Number of inputs | 4 (shared with selected analog inputs) |

| Signal types     | square wave, hall-effect, ECU pulse outputs |

| Typical uses     | engine speed, wheel speed, vehicle speed |

Signal conditioning and scaling are configurable in software.

## Sensor Supply

| Output    | Voltage | Maximum current | Purpose                         |

| --------- | ------- | --------------- | ------------------------------- |

| SENSOR5V  | 5 V     | 0.5 A           | Powering external sensors       |

| sGND      | —       | —               | Dedicated sensor ground reference |

Using the dedicated sensor ground improves measurement accuracy and reduces noise.

## Digital Outputs

| Parameter         | Value                         |

| ----------------- | ----------------------------- |

| Number of outputs | 5                             |

| Maximum current   | 0.9 A per output              |

| Output type       | Low-side driver               |

| Shared with       | Selected analog input pins    |

Typical applications: relay control, indicator outputs, and actuator control.

Output behaviour is fully configurable.

## Transmission Power and Wake-up

| Function                    | Specification                    |

| --------------------------- | -------------------------------- |

| Transmission power output   | Integrated semiconductor relay (KL30B) |

| Relay rated current         | 15 A                             |

| Transmission wake-up output | Dedicated                        |

All transmission power control and wake-up signalling is handled directly by the

device. External relays are not required, and internal logic ensures correct

startup and shutdown sequencing.

## Power Monitoring

IOcan can measure the transmission's current draw, supporting system monitoring,

diagnostics, and safety/fault detection.

## Connector

| Main connector | TE Connectivity Superseal 1.0, 26-pin, 2-row |

Pin assignments and wiring details are documented in [[CAN Gateway Pinout]].

## Environmental and Mechanical

| Parameter           | Value           |

| ------------------- | --------------- |

| Physical dimensions | To be specified |

| Weight              | To be specified |

IOcan is designed for automotive environments. Proper wiring and grounding are

required for reliable operation:

* twisted-pair wiring for CAN networks

* short CAN stubs

* 120 Ω termination at both ends of the bus

* properly crimped terminals (soldering is discouraged — flux residue causes wires to corrode and stiffen)

This device controls part of the powertrain. Take great care when wiring the

device and the transmission.

## Summary

| Feature                  | Specification                     |

| ------------------------ | --------------------------------- |

| Supply (nominal / max)   | 14.4 V / 18 V                     |

| CAN interfaces           | 4 × CAN FD (CAN 2.0B compatible)  |

| Analog inputs            | 11 (7 × 0–12 V, 4 × 0–5 V)        |

| Frequency inputs         | 4                                 |

| Digital outputs          | 5 × 0.9 A                         |

| Sensor supply            | 5 V @ 0.5 A                       |

| Transmission power relay | 15 A (KL30B)                      |

| USB                      | USB-C, 480 Mbps                   |

| Main connector           | TE Superseal 1.0, 26-pin          |