Features:
- Sixteen Temperature Input Channels
- Supports Two-Wire Thermistor Temperature Sensors
- Heavy Duty Over-Voltage Protection
- Switched, Low Drive Current Reduces Self-Heating
- Internal Analog Sample/Hold and Digital Data Buffer
- Supports High Scan Rates to 58.8 Ksample/Sec
The GE Fanuc / Greenspring IP-Thermistor 16 Channel Thermistor Temperature Reading IndustryPack is a precision temperature reading IndustryPack for 16 channels of thermistor based sensors. It is a complete IP, providing a current source, multiplexers, buffers
and amplifier, 12-bit analog to digital converter, factory-set offset and gain adjustment circuitry,
timing and interrupt logic, and IP bus interface. IP-Thermistor is a single-high IndustryPack.
To measure temperature using a thermistor, a small stable current is passed through the sensor.
Then the voltage drop is read using a buffered Analog to Digital Converter (ADC). IPThermistor
uses a switched, highly stable, 1 mA current source. The current source is switched among the sixteen sensors,
minimizing self-heating. The current source may be switched off to all sensors via software. A
12-bit ADC with an integral sample/hold is used to convert the voltage to a digital value. A
conversion cycle takes a total of 17 µseconds. All timing, control logic, conversion and buffering
is provided on the IP. When the conversion is done, the IP will either generate a programmable,
vectored interrupt, or a ADC_BUSY bit may be polled by the host. The 12-bit data is signextended
by the control logic to fill a 16-bit word, and may be read any number of times by the
host until the next conversion has completed.
The IP-Thermistor includes a programmable 16-bit pacer clock with one µsec resolution. This
clock may be programmed to start a conversion every 17 to 65,535 µsec continually.
Alternatively the pacer clock may be used as a general purpose timer. The pacer clock has
interrupt capability. Overvoltage protection of the IP-Thermistor's inputs is provided the multiplexers. These
multiplexers can withstand up to ±35V continuous, with or without power applied. IP-Thermistor includes a calibration 2 Kbit EEPROM. Normally this EEPROM is not required; however, it is fully supported and may be used to store per-channel information by the system
integrator, This is useful, for example, for holding thermistor type and calibration data that is
sensor or system dependent.
The IP-Thermistor Greenspring 16 Channel Thermistor Temperature Reading IndustryPack may still be available for purchase and support from Artisan Technology Group beyond End-Of-Life (EOL) by the manufacturer (OEM).
Artisan Scientific Corporation dba Artisan Technology Group is not affiliated with or a distributor for Greenspring. The depiction, description, or sale of products featuring names, trademarks, brands, and logos is for identification and/or reference purposes only and does not indicate any affiliation with or authorization by any rights holder.