(under construction)
Description
The 16-Channel Thermistor Interface is a versatile, high-precision device designed for monitoring and measuring up to 16 standard NTC thermistors. With a configurable sample rate ranging from 100Hz to 1/60Hz, it seamlessly integrates into CANopenĀ® networks using the CiA 404 profile for measuring devices. Equipped with a 24-bit delta-sigma ADC and autoranging excitation source, this module ensures accurate temperature readings. It features a user-friendly OLED display for local control and configuration, galvanic isolation, and robust bus-powered operation. Perfect for industrial temperature monitoring and control applications.
We needed a CAN-bus connected 16-channel temperature sensing interface for a circuit-board functional test application. Specifically to monitor the MOSFET temperatures in the flyback converters of the OGS battery board with active balancers. Not finding such interface, we started designing a quick design to perform this task. This escalated quickly to a real product design; this CANopen® interface for 16 thermistors.
Note that this device is not particularly intended for high-accuracy applications, mostly because that does not fit the capabilities of low cost NTC thermistor sensors. Instead, the device enables expanding temperature monitoring using low-cost sensors. For example to monitor motors, bearings, cooling systems, etc.
Functionality
- Measure 16 standard NTC thermistors (typically 10kΩ)
- Sample rate 100Hz down to 1/60Hz
- CANopen® fieldbus, measuring devices profile CiA 404
- Configuration via CANopen, control panel or using PC application via micro-USB port
- Possibility for custom firmware with specific signal processing functions

Specifications
- 24-Bit delta-sigma analog digital converter
- Autoranging excitation source 10µA-1.5mA, max 3.3V
- OLED display shows temperature readings (°C or °F) and allows for local control, CAN-bus configuration and SDO editing
- Sensor inputs galvanically isolated from CAN-bus & power (not from each other)
- CANopen® device profile for measuring devices and closed-loop controllers (CiA 404)
- Supports LSS node-ID assignment and Fastscan (CiA 305)
- Supports automatic bit-rate detection between 10kbps and 1Mbps (CiA 801)
- CAN-FD 'Ready' (no active support for FD datarates yet, but tolerates FD traffic on bus)
- Up-to-date EDS file generated by and downloadable from the device
- Supports power management & monitoring features (CiA 302-9 + custom for monitoring of bus voltage, input current, CPU voltage and CPU temperature)
- Bus powered, operating voltage 10-30VDC, <1W
- 34-Pin 0.1"/2.54mm box-header for sensor connections
- DIN-rail enclosure 101x80, width 17.5mm
- T-Bus CAN-bus connection // 5-pin 3.81mm terminal block
- Micro-USB control & bus-powered capability
- Mating terminal blocks included, including the T-Bus contact block
- ATEX increased safety 'ec' (IEC 60079-7)
Plug & Play configuration

Out of the box, the device is configured as self-starting to switch to OPERATIONAL state autonomously. The node-ID is programmed to 36 and four TPDOs are configured for 1-second timer-based event trigger. This means the device can be used simply by listening to 'raw' CAN-IDs 0x1A4/0x2A4/0x3A4/0x3A4 to receive the periodic readings from the sensors. (Raw meaning without any CANopen stack or functionality on the receiving end.)
- Automatic switch to NMT state OPERATIONAL
- Four TPDOs are sent every second:
- TPDO1 (CAN-ID 0x180+$NODEID) sends 8 bytes containing CH1-CH4 as 16-bit integers
- TPDO2 (CAN-ID 0x280+$NODEID) sends 8 bytes containing CH5-CH8 as 16-bit integers
- TPDO3 (CAN-ID 0x380+$NODEID) sends 8 bytes containing CH9-CH12 as 16-bit integers
- TPDO4 (CAN-ID 0x480+$NODEID) sends 8 bytes containing CH13-CH16 as 16-bit integers

Availability
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'OGS control' is a registered trademark of Reijneveld Machinebouw B.V.