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| resources:tools-software:product-support-software:sigma-delta_adc_temperature-ble_demo [21 May 2020 12:32] – final draft3 Mahesh Phalke | resources:tools-software:product-support-software:sigma-delta_adc_temperature-ble_demo [14 Jan 2021 05:38] (current) – use wiki interwiki links Robin Getz |
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| ===== Introduction ===== | ===== Introduction ===== |
| This page gives an overview of using the Analog Devices Sigma Delta ADCs with Cortex-M3 ARM processor based [[https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EV-COG-AD3029.html#eb-overview | ADuCM3029 Cog Eval Board]]. The intended demo application shows how to convert an external sensor data into actual units and transmit them over either Bluetooth or UART link using ADIs [[https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EV-COG-AD3029.html#eb-overview | ADuCM3029 Cog board]] and [[https://wiki.analog.com/resources/eval/user-guides/ev-cog-bleintp1z | Bluetooth Eval board]]. The operation can be better illustrated using below diagram. | This page gives an overview of using the Analog Devices Sigma Delta ADCs with Cortex-M3 ARM processor based [[adi>en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EV-COG-AD3029.html#eb-overview | ADuCM3029 Cog Eval Board]]. The intended demo application shows how to convert an external sensor data into actual units and transmit them over either Bluetooth or UART link using ADIs [[adi>en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EV-COG-AD3029.html#eb-overview | ADuCM3029 Cog board]] and [[/resources/eval/user-guides/ev-cog-bleintp1z | Bluetooth Eval board]]. The operation can be better illustrated using below diagram. |
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| {{ :resources:tools-software:product-support-software:ad7124_temp_sensing.jpg?400 |}} | {{ :resources:tools-software:product-support-software:ad7124_temp_sensing.jpg?400 |}} |
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| [[https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/eval-ad7124-8.html | AD7124 Eval board]] has default on-board KTY-81/110 RTD sensor (silicon Thermistor) connected between analog inputs AIN4 and AIN5. However, for the complete RTD measurement, the precision resistor (Rref) needs to be connectd externally along with Rhead headroom resistor. Rref needs to have 0.1% precision for complete accuracy. The choice of this reference resistor depends upon the Ref output voltage and excitation current. Use below application note for more details on the temperature sensing using RTD: | [[adi>en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/eval-ad7124-8.html | AD7124 Eval board]] has default on-board KTY-81/110 RTD sensor (silicon Thermistor) connected between analog inputs AIN4 and AIN5. However, for the complete RTD measurement, the precision resistor (Rref) needs to be connectd externally along with Rhead headroom resistor. Rref needs to have 0.1% precision for complete accuracy. The choice of this reference resistor depends upon the Ref output voltage and excitation current. Use below application note for more details on the temperature sensing using RTD: |
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| [[https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0381.pdf| RTD Measurement System Using a Precision Sigma-Delta ADC]] | [[adi>media/en/reference-design-documentation/reference-designs/CN0381.pdf| RTD Measurement System Using a Precision Sigma-Delta ADC]] |
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| Thermocouple needs to be connected externally between analog inputs AIN2 and AIN3. Use below application note for more details on the temperature sensing using Thermocouple: | Thermocouple needs to be connected externally between analog inputs AIN2 and AIN3. Use below application note for more details on the temperature sensing using Thermocouple: |
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| [[https://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0384.pdf| Thermocouple Measurement System Using a Precision Sigma-Delta ADC]] | [[adi>media/en/reference-design-documentation/reference-designs/CN0384.pdf| Thermocouple Measurement System Using a Precision Sigma-Delta ADC]] |
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| === 2) Interfacing ADuCM3029 Cog Board with Sigma Delta ADCs/Eval Board === | === 2) Interfacing ADuCM3029 Cog Board with Sigma Delta ADCs/Eval Board === |
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| The ADuCM3029 COG board is connected to Sigma Delta ADC Eval board using a [[https://wiki.analog.com/resources/eval/user-guides/ev-gear-expander1z | Gear Expander board]]. Depending upon the digital interface used on Sigma Delta ADCs, the connection could be either 4 line SPI or 3 line I2C. The connection can be done either using [[https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/sdp-breakout-board.html | SDP breakout board]] or by directly soldering fly wires from the ADC Evaluation board to ADuCM3029 Expander Gear board. The sample connection for the AD7124 Eval board with COG board is shown below using a fly wires. The wires are directly soldered on the Eval board, but for better connection, use the SDP breakout board: | The ADuCM3029 COG board is connected to Sigma Delta ADC Eval board using a [[/resources/eval/user-guides/ev-gear-expander1z | Gear Expander board]]. Depending upon the digital interface used on Sigma Delta ADCs, the connection could be either 4 line SPI or 3 line I2C. The connection can be done either using [[adi>en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/sdp-breakout-board.html | SDP breakout board]] or by directly soldering fly wires from the ADC Evaluation board to ADuCM3029 Expander Gear board. The sample connection for the AD7124 Eval board with COG board is shown below using a fly wires. The wires are directly soldered on the Eval board, but for better connection, use the SDP breakout board: |
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| {{ :resources:tools-software:product-support-software:aducm3029-ad7124_eval.jpg?400 |}} | {{ :resources:tools-software:product-support-software:aducm3029-ad7124_eval.jpg?400 |}} |
| === 3) Interfacing ADuCM3029 Cog Board with Bluetooth Eval Board === | === 3) Interfacing ADuCM3029 Cog Board with Bluetooth Eval Board === |
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| The below diagrams shows the connection between ADuCM3029 COG Board and Bluetooth Eval board. There are no additional jumper settings needed. Please refer [[https://wiki.analog.com/resources/eval/user-guides/ev-cog-bleintp1z | user manual]] for more details on the hardware connection: | The below diagrams shows the connection between ADuCM3029 COG Board and Bluetooth Eval board. There are no additional jumper settings needed. Please refer [[/resources/eval/user-guides/ev-cog-bleintp1z | user manual]] for more details on the hardware connection: |
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| == Primary-side == | == Primary-side == |
| <WRAP round download> | <WRAP round download> |
| Latest firmware (Use below link): | Latest firmware (Use below link): |
| * [[ | Sigma Delta ADC Temperature-BLE Demo Firmware Example]] | * [[ https://github.com/analogdevicesinc/EV-COG-AD3029LZ/tree/master/sd-adc_cces_temperature-to-ble%20Example | Sigma Delta ADC Temperature-BLE Demo Firmware Example]] |
| </WRAP> | </WRAP> |
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| ==== Development Tools ==== | ==== Development Tools ==== |
| The firmware uses Analog Devices [[https://www.analog.com/en/design-center/evaluation-hardware-and-software/software/adswt-cces.html | Cross Core Embedded Studio (CCES)]] as a development IDE, with in-built ARM GCC compiler. To develop CCES ARM based project, follow below wiki page guidelines: | The firmware uses Analog Devices [[adi>en/design-center/evaluation-hardware-and-software/software/adswt-cces.html | Cross Core Embedded Studio (CCES)]] as a development IDE, with in-built ARM GCC compiler. To develop CCES ARM based project, follow below wiki page guidelines: |
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| https://wiki.analog.com/resources/eval/user-guides/eval-adicup3029/tools/cces_user_guide | https://wiki.analog.com/resources/eval/user-guides/eval-adicup3029/tools/cces_user_guide |
| . | . |
| } > DSRAM_A | } > DSRAM_A |
| | </code> |
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| | === CMSIS Compatibility (startup_ADuCM3029.c) === |
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| | The ADuCM3029 software package startup file is not yet updated to support latest changes in the ARM CMSIS drivers (CMSIS-CORE (M) Version 5.3.0 and above) and it creates conflicts in the startup_ADuCM3029.c file for duplicate identifiers. To avoid this conflict, startup file is modified as below: |
| | <code c> |
| | #if __CM_CMSIS_VERSION < 0x050003 |
| | // For CMSIS-CORE(M) version 5.3.0 above, the below variables have defined |
| | // with different data types in cmsis_gcc.h file from the device CMSIS pack. |
| | // The ADuCM3029 start-up code is not yet up-to-date with the latest changes from |
| | // the CMSIS pack. Hence commenting below code to avoid compilation errors. |
| | extern uint32_t __copy_table_start__; |
| | extern uint32_t __copy_table_end__; |
| | extern uint32_t __zero_table_start__; |
| | extern uint32_t __zero_table_end__; |
| | #endif |
| </code> | </code> |
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| <note tip> | <note tip> |
| This page might not cover the all minute details of hardware/software configuration and operation. All the necessary links for the associated documents are provided above. Feel free to consult Analog Devices [[https://www.analog.com/engineerzone|Engineer-Zone]] for feature requests, feedback, bug-reports etc. | This page might not cover the all minute details of hardware/software configuration and operation. All the necessary links for the associated documents are provided above. Feel free to consult Analog Devices [[adi>engineerzone|Engineer-Zone]] for feature requests, feedback, bug-reports etc. |
| </note> | </note> |
