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| resources:demo:reference-designs:demo-ad5758-ao8z:hardware_details [15 Aug 2019 12:55] – [Schematic] Donal O''Sullivan | resources:demo:reference-designs:demo-ad5758-ao8z:hardware_details [29 Dec 2020 23:08] (current) – fix links Robin Getz |
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| ==== Integrated Isolated Power and Data ==== | ==== Integrated Isolated Power and Data ==== |
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| Using ADI’s patented [[adi>https://www.analog.com/en/products/interface-isolation.html|iCoupler]]™ technology, the [[adi>http://www.analog.com/adp1031|ADP1031]] integrates three isolated power rails, SPI and GPIO data isolation in a very small form factor of 7 mm X 9 mm. This high level of integration solves the PCB real estate challenges as it consolidates all channel isolation requirements into a very small area on the PCB. The [[adi>http://www.analog.com/adp1031|ADP1031]] also integrates a Power Good signal. | Using ADI’s patented [[adi>en/products/interface-isolation.html|iCoupler]]™ technology, the [[adi>ADP1031]] integrates three isolated power rails, SPI and GPIO data isolation in a very small form factor of 7 mm X 9 mm. This high level of integration solves the PCB real estate challenges as it consolidates all channel isolation requirements into a very small area on the PCB. The [[adi>ADP1031]] also integrates a Power Good signal. |
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| ==== Low Power Dissipation ==== | ==== Low Power Dissipation ==== |
| Drawing on Analog Devices power expertise, the [[adi>http://www.analog.com/ad5758|AD5758]] implements a technique called **D**ynamic **P**ower **C**ontrol (DPC) to minimize the power dissipation in the module under the worse case operating conditions when the part is configured for current output. It does this by continuously tracking the output voltage and using an integrated programmable high-efficiency buck converter to reduce the power supply voltage to the output driver to the minimum required to maintain the output load current. When DPC is enabled for current output modes, the [[adi>http://www.analog.com/ad5758|AD5758]] will automatically adjust the DPC voltage to minimize power dissipation under all load conditions. | Drawing on Analog Devices power expertise, the [[adi>AD5758]] implements a technique called **D**ynamic **P**ower **C**ontrol (DPC) to minimize the power dissipation in the module under the worse case operating conditions when the part is configured for current output. It does this by continuously tracking the output voltage and using an integrated programmable high-efficiency buck converter to reduce the power supply voltage to the output driver to the minimum required to maintain the output load current. When DPC is enabled for current output modes, the [[adi>AD5758]] will automatically adjust the DPC voltage to minimize power dissipation under all load conditions. |
| The [[adi>http://www.analog.com/adp1031|ADP1031]] is optimized to provide efficient isolated power for the [[adi>http://www.analog.com/ad5758|AD5758]] under worst-case load conditions so that the total channel power dissipation is minimized. The high-speed SPI channel integrated into the [[adi>http://www.analog.com/adp1031|ADP1031]] is also designed to reduce power dissipation when active and enters an ultra-low power state when inactive. | The [[adi>ADP1031]] is optimized to provide efficient isolated power for the [[adi>AD5758]] under worst-case load conditions so that the total channel power dissipation is minimized. The high-speed SPI channel integrated into the [[adi>ADP1031]] is also designed to reduce power dissipation when active and enters an ultra-low power state when inactive. |
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| ==== Isolation Flyback Transformer ==== | ==== Isolation Flyback Transformer ==== |
| Because the [[adi>http://www.analog.com/adp1031|ADP1031]] integrates the feedback channel, the design of the flyback transformer is simplified resulting in a single primary and secondary winding required. This means the transformer form factor can be smaller and still meet the efficiency and isolation requirements. The recommended transformer for the [[adi>http://www.analog.com/adp1031|ADP1031]] has a footprint size of 8.6 mm X 8.26 mm and is less than 9.7 mm tall. | Because the [[adi>ADP1031]] integrates the feedback channel, the design of the flyback transformer is simplified resulting in a single primary and secondary winding required. This means the transformer form factor can be smaller and still meet the efficiency and isolation requirements. The recommended transformer for the [[adi>ADP1031]] has a footprint size of 8.6 mm X 8.26 mm and is less than 9.7 mm tall. |
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| ==== Solution Size ==== | ==== Solution Size ==== |
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| ==== Flexible Precision Channel with Diagnostics and HART Connectivity ==== | ==== Flexible Precision Channel with Diagnostics and HART Connectivity ==== |
| The [[adi>http://www.analog.com/ad5758|AD5758]] integrates advanced diagnostics to allow incorrect behaviour and faults to be quickly detected. | The [[adi>AD5758]] integrates advanced diagnostics to allow incorrect behavior and faults to be quickly detected. |
| It integrates a digital diagnostic results register and an analog diagnostic results register, which contain error flags for the on-chip digital and analog diagnostic features. Some of the key diagnostics available are | It integrates a digital diagnostic results register and an analog diagnostic results register, which contain error flags for the on-chip digital and analog diagnostic features. Some of the key diagnostics available are |
| - Watchdog timer error | - Watchdog timer error |
| - Internal supply error | - Internal supply error |
| - DPC error | - DPC error |
| For a complete list of diagnostics, see the [[adi>http://www.analog.com/ad5758|AD5758]] datasheet. | For a complete list of diagnostics, see the [[adi>AD5758]] datasheet. |
| The [[adi>http://www.analog.com/ad5758|AD5758]] also incorporates a 12-bit ADC to provide diagnostic measurements on user-selectable nodes, such as internal supplies and grounds, internal die temperature monitors, internal references among other signals. | The [[adi>AD5758]] also incorporates a 12-bit ADC to provide diagnostic measurements on user-selectable nodes, such as internal supplies and grounds, internal die temperature monitors, internal references among other signals. |
| The [[adi>http://www.analog.com/ad5758|AD5758]] has a C<sub>HART</sub> pin, onto which a [[https://www.fieldcommgroup.org/technologies/hart|HART]] signal can be capacitively coupled. Once HART connectivity is enabled, the HART signal appears on the VIOUT pin. This functionality is only available when VIOUT is configured to output current. | The [[adi>AD5758]] has a C<sub>HART</sub> pin, onto which a [[https://www.fieldcommgroup.org/technologies/hart|HART]] signal can be capacitively coupled. Once HART connectivity is enabled, the HART signal appears on the VIOUT pin. This functionality is only available when VIOUT is configured to output current. |
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| ==== Schematic ==== | ==== Schematic ==== |
| {{ :resources:demo:reference-designs:demo-ad5758-ao8z:demo-ad5757-ao8z:02_047243c_top.pdf |Schematic PDF}} | {{ :resources:demo:reference-designs:demo-ad5758-ao8z:demo-ad5757-ao8z:02_047243c_top.pdf |Schematic PDF}} |
| === Page 2 - Power Supplies === | === Page 2 - Power Supplies === |
| The 3.3 V system power is generated by U3, an [[adi>http://www.analog.com/adp2360|ADP2360]] high efficiency buck converter. This takes an input supply from 4.5 V to 60 V and generated the 3.3 V supply rail which is used by the [[adi>>https://www.analog.com/en/products/aducm3029.html|ADUCM3029]], an ultra low-power ARM Cortex-M3 MCU with integrated power management and 256 KB of embedded flash memory. | The 3.3 V system power is generated by U3, an [[adi>ADP2360]] high efficiency buck converter. This takes an input supply from 4.5 V to 60 V and generated the 3.3 V supply rail which is used by the [[adi>ADUCM3029]], an ultra low-power ARM Cortex-M3 MCU with integrated power management and 256 KB of embedded flash memory. |
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| The field power supply is connected to all 8 [[adi>>https://www.analog.com/en/products/adp1031|ADP1031]]s via a polarity protection diode, D2. This field power supply domain is fully isolated (300 V Basic) from the system domain, containing the [[adi>>https://www.analog.com/en/products/aducm3029|ADUCM3029]], and the eight field domain, where each [[adi>>https://www.analog.com/en/products/ad5758|AD5758]]'s is located. | The field power supply is connected to all 8 [[adi>ADP1031]]s via a polarity protection diode, D2. This field power supply domain is fully isolated (300 V Basic) from the system domain, containing the [[adi>ADUCM3029]], and the eight field domain, where each [[adi>AD5758]]'s is located. |
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| The board can be powered from a single 18 V to 32 V supply by inserting jumpers P5 & P6 which connects the system and field power domains together. | The board can be powered from a single 18 V to 32 V supply by inserting jumpers P5 & P6 which connects the system and field power domains together. |
| === Page 3 - Controller === | === Page 3 - Controller === |
| This page shows the connections to the [[adi>>https://www.analog.com/en/products/aducm3029|ADUCM3029]] and connections to the "Fault" and "Power Good" LEDs. | This page shows the connections to the [[adi>ADUCM3029]] and connections to the "Fault" and "Power Good" LEDs. |
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| === Page 4 - USB UART === | === Page 4 - USB UART === |
| These pages show the connectivity for each output channel. Functionality is identical across all channels so only channel 0 (page 6) will be explained in detail. | These pages show the connectivity for each output channel. Functionality is identical across all channels so only channel 0 (page 6) will be explained in detail. |
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| U9, the [[adi>>https://www.analog.com/en/products/adp1031|ADP1031]], generates a isolated 24 V (+24V_ISO) power supplies from the 18 V to 32 V field power supply using an integrated flyback converter and external transformer T3. The +24V_ISO, which is connected directly to the [[adi>>https://www.analog.com/en/products/ad5758|AD5758]] AVDD1 supply. The +24V_ISO supply is also stepped down to 5.15 V using an integrated buck converter. This 5.15 V supply is connected to AVDD2 on the [[adi>>https://www.analog.com/en/products/ad5758|AD5758]]. | U9, the [[adi>ADP1031]], generates a isolated 24 V (+24V_ISO) power supplies from the 18 V to 32 V field power supply using an integrated flyback converter and external transformer T3. The +24V_ISO, which is connected directly to the [[adi>AD5758]] AVDD1 supply. The +24V_ISO supply is also stepped down to 5.15 V using an integrated buck converter. This 5.15 V supply is connected to AVDD2 on the [[adi>AD5758]]. |
| A -15 V supply is also generated from the +24V_ISO which is used by the [[adi>>https://www.analog.com/en/products/ad5758|AD5758]] in bipolar voltage output mode. | A -15 V supply is also generated from the +24V_ISO which is used by the [[adi>AD5758]] in bipolar voltage output mode. |
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