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Grove - 1-Wire Thermocouple Amplifier 熱電偶放大器 (MAX31850K) (101020555)
Description
The Grove - 1-Wire Thermocouple Amplifier (MAX31850K) is a thermocouple-to-digital converters with 14-bit resolution and cold-junction compensation. This module is designed to be used in conjunction with a k-type thermocouple. The thermocouples have a much larger measurement range than thermistors. For example, this k-type thermocouple on our website has a measurement range of -50℃ to +600℃.
This module is based on the MAX31850K, which integrates amplifier, ADC and 64-bit ROM. Thanks to the 64-bit ROM, each device has a unique 64-bit serial code, which allows multiple units to function on the same 1-Wire bus. Therefore, it is simple to use one microcontroller (the master device) to monitor temperature from many thermocouples distributed over a large area.
Again, this module can't work alone, it must work with a k-type thermocouple, if you do not have one, you can consider Thermocouple Temperature Sensor K Type-1M in our bazaar.
Features
- Integrated Cold-Junction Compensation
- Wide Conversion Range: allow readings from -270℃ to +1768℃
- 14-Bit, 0.25℃ Resolution
- Will not work with any other kind of thermocouple except K type
- Detects Thermocouple Shorts to GND or VDD
- Detects Open Thermocouple
Typical Applications
- Medical
- Appliances
- Industrial
- HVAC(Heating, Ventilation and Air Conditioning)
Pin Out
Assembly drawing
Attention:
Usually the positive pole of the K-type thermocouple is red and the negative is light white, but we can't guarantee that all K-type thermocouples are like this. So the above diagram is only for the K-type thermocouple purchased from our website. If your K-type thermocouple is obtained from other places, you need to use other methods to judge the positive and negative.
Schematic
Input Jack
Because of the small signal levels involved, we take a lot measures to filter the noise.
- 1--L1,L2 We use thermocouple up to 1 meter long. Such long wires can be regarded as antennas, which will receive spatial electric field interference and generate high frequency noise. So we use two inductances to filter the high frequency noise.
- 2--C1 It is strongly recommended by the chip manufacturer to add a 10nF ceramic surfacemount differential capacitor, placed across the T+ and T- pins, in order to filter noise on the thermocouple lines.
- 3--D1 We use the SZNUP2105LT3G DUAL BIDIRECTIONAL VOLTAGE SUPPRESSOR to protect this module from ESD(Electro-Static discharge).
Bi-directional level shifter circuit
This is a typical Bi-directional level shifter circuit to connect two different voltage section. The left part, DQ pin of the MAX31850K use 3.3V, if the Arduino use 5V, this circuit will be needed. In the schematic above, Q6 is N-Channel MOSFET 2N7002, which act as a bidirectional switch. In order to better understand this part, you can refer to the AN10441.
Technical Details
| Dimensions | 40mm x 20mm x 18mm |
| Weight | G.W 11.10g N.W 4.90g |
| Battery | Exclude |
| Operating Voltage | 3.3V / 5V |
| Temperature Resolution | 14 bits |
| Temperature Accuracy | ± 2℃ |
| Operating Temperature Range | -40℃ to +125℃ |
| Storage Temperature Range | -65℃ to +150℃ |
| Allow Readings Range | -270℃ to +1768℃ |
| Input Jack | DIP Female Blue-2Pin |
| Output Interface | 1-Wire bus |
Part List
| Grove - 1-Wire Themocouple Amplifier (MAX31850K) | 1 |
| Grove Cable | 1 |
ECCN/HTS
| ECCN | EAR99 |
| HSCODE | 9025900090 |
