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| resources:eval:user-guides:eval-adicup360:hardware:cn0336 [02 Apr 2018 04:23] – Ramon Glenn Amparo | resources:eval:user-guides:eval-adicup360:hardware:cn0336 [02 Apr 2018 04:51] (current) – Ramon Glenn Amparo |
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| ====== EVAL-CN0336-PMDZ PMOD ====== | ====== EVAL-CN0336-PMDZ PMOD ====== |
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| The [[ADI>CN0336]] is a completely isolated 12-bit, 300 kSPS data acquisition system that provides robust and complete solution for 4 mA-to-20 mA current to digital conversion with isolation, for sensors with standard 4-20 mA output. The CN0336 circuit consists of an input current-to-voltage converter, a level shifting circuit, an ADC stage and an output isolation stage. The 4 mA to 20 mA input signals is converted into voltage levels compatible with the input range of the ADC (0 V - 2.5 V). The 12-bits ADC value is received via SPI interface of the [[ADI>EVAL-ADICUP360]] board. The design solution is optimized for high precision and low-cost measurement, using only three active devices, and has a total unadjusted error of less than 0.1% of full scale range. The total error after room temperature calibration is ±0.06% FSR over a ±10°C temperature change, making it ideal for a wide variety of industrial measurements. | The [[ADI>CN0336]] is a completely isolated 12-bit, 300 kSPS data acquisition system that provides robust and complete solution for 4 mA-to-20 mA current to digital conversion with isolation, for sensors with standard 4-20 mA output. The CN0336 circuit consists of an input current-to-voltage converter, a level shifting circuit, an ADC stage and an output isolation stage. The 4 mA to 20 mA input signals is converted into voltage levels compatible with the input range of the ADC (0 V - 2.5 V). The 12-bits ADC value is received via SPI interface of the [[ADI>EVAL-ADICUP360]] board. The design solution is optimized for high precision and low-cost measurement, using only three active devices, and has a total unadjusted error of less than 0.1% of full scale range. The total error after room temperature calibration is ±0.06% FSR over a ±10°C temperature change, making it ideal for a wide variety of industrial measurements. |
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| {{:resources:eval:user-guides:eval-adicup360:hardware:cn0336:cn0336-hw-1024.jpg?640|}} | {{:resources:eval:user-guides:eval-adicup360:hardware:cn0336:cn0336-hw-1024.jpg?640|}} |
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| ==== Input Interface ==== | ==== Input Interface ==== |
| The system can process 4 to 20 mA input signals by connecting the positive terminal to Pin 1 and the ground terminal to Pin 2 of J2 terminal block. | The circuit consists of an input current-to-voltage converter, a level shifting circuit, an ADC stage, and an output isolation stage. The system can process 4 to 20 mA input signals by connecting the positive terminal to Pin 1 and the ground terminal to Pin 2 of J2 terminal block. A diode is connected to provide protection against an accidental reverse connection of the input current source. The calculation of gain and resistor values can be found in [[ADI>/media/en/reference-design-documentation/reference-designs/CN0336.pdf|CN0336 Circuit Note]]. The guide on how to use the two-point calibration can be found at the software demo [[resources:eval:user-guides:eval-adicup360:reference_designs:demo_cn0336|page]]. |
| <note> The label on the board can also be used as a guide</note> | <note> The labels on the board can also be used as a guide</note> |
| {{ :resources:eval:user-guides:eval-adicup360:hardware:cn0336:cn0336-hw-1024_2.jpg?150 |}} | {{ :resources:eval:user-guides:eval-adicup360:hardware:cn0336:cn0336-hw-1024_2.jpg?150 |}} |
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| When using the EVAL-CN0336-PMDZ PMOD board, the 3.3V power for the PMOD comes directly from the host board it is connected to. The power from the host is generally capable of providing up to 100 mA at 3.3V, but for complete PMOD power specifications can be found at [[https://www.digilentinc.com/Pmods/Digilent-Pmod_%20Interface_Specification.pdf|Digilent Pmod Interface Specification]]. | When using the EVAL-CN0336-PMDZ PMOD board, the 3.3V power for the PMOD comes directly from the host board it is connected to. The power from the host is generally capable of providing up to 100 mA at 3.3V, but for complete PMOD power specifications can be found at [[https://www.digilentinc.com/Pmods/Digilent-Pmod_%20Interface_Specification.pdf|Digilent Pmod Interface Specification]]. |
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| The fastest way to tell if the EVAL-CN0336-PMDZ board is powered is by seeing if the LED located <fc #ff0000>here</fc> on the board is illuminated. | The fastest way to tell if the EVAL-CN0336-PMDZ board is powered is by seeing if diode <fc #ff0000>D2</fc> is illuminated. |
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| {{ :resources:eval:user-guides:eval-adicup360:hardware:cn0336:cn0336-hw-1024_1.jpg?400 |}} | {{ :resources:eval:user-guides:eval-adicup360:hardware:cn0336:cn0336-hw-1024_1.jpg?400 |}} |
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| ^ Pin Number ^ Pin Function ^ Mnemonic ^ | ^ Pin Number ^ Pin Function ^ Mnemonic ^ |
| | P4.1 | Chip Select | CS | | | J1.1 | Chip Select | CS | |
| | P4.2 | No Connect | NC | | | J1.2 | No Connect | NC | |
| | P4.3 | Master In Slave Out | MISO | | | J1.3 | Master In Slave Out | MISO | |
| | P4.4 | Serial Clock | SCLK | | | J1.4 | Serial Clock | SCLK | |
| | P4.5 | Digital Ground | DGND | | | J1.5 | Digital Ground | DGND | |
| | P4.6 | Digital Power | VDD | | | J1.6 | Digital Power | VDD | |
| | P4.7 | No Connect | NC | | | J1.7 | No Connect | NC | |
| | P4.8 | Not Connected | NC | | | J1.8 | Not Connected | NC | |
| | P4.9 | Convert Start | CONVST| | | J1.9 | Convert Start | CONVST| |
| | P4.10 | No Connect | NC | | | J1.10 | No Connect | NC | |
| | P4.11 | Digital Ground | DGND | | | J1.11 | Digital Ground | DGND | |
| | P4.12 | Digital Power | VDD | | | J1.12 | Digital Power | VDD | |
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| ===== Software examples ===== | ===== Software examples ===== |
