7.1. Signal Sensing in Sigma-Delta ADCs
The design downloads and filters all sigma delta inputs in parallel so no skew exists between the samples that it feeds to the software application.
Each ADC type has a different input ranges. The corresponding 'C' data type is 16-bit integer.
|ADC Type||Input Range||Count Range||C Data type|
|Sigma-delta ADC||-320…+320mV||-32768…+32767||Signed 16-bit|
|Sigma-delta DC link voltage||0…+320mV||0…+32767||Signed or unsigned 16-bit|
Position feedback samples are scaled to a 23 bit unsigned integer, for consistency across all encoder types supported by this and previous Drive-On-Chip designs.
|Feedback Quantity||Sigma Delta Interface IP||Sigma Delta Scaling for Tandem Motion Power Board|
|Motor Phase Voltages||ADC interface||545 counts/V|
|DC Bus Voltage||ADC interface||40 counts/V|
|Input Voltage||DC Link||895 counts/V|
|Input Current||DC Link||256 counts/A|
|DC-DC Inductor Current||ADC interface||717 counts/A|
|DC Bus Current||DC Link||1638 counts/A|
|Motor Phase Currents||ADC interface||1024 counts/A|
|Feedback Quantity||Sigma Delta Interface IP||Scaling for Software Interface (Avalon Memory-mapped Registers)||Scaling for DC-DC Controller Hardware IP|
|Motor Phase Voltages||ADC interface in DOC_Axix_Periphs subsystem||545 counts/V||N/A|
|Motor Phase Currents||ADC interface in DOC_Axix_Periphs subsystem||1024 counts/A||N/A|
|DC link Input Voltage||DC Link Monitor in lvmc_dclink subsystem||895 counts/V||N/A|
|DC link input Current||DC Link Monitor in lvmc_dclink subsystem||256 counts/A||N/A|
|DC link output (DC Bus) Current||DC Link Monitor in lvmc_dclink subsystem||1638 counts/A||N/A|
|DC link output (DC Bus) Voltage||ADC interface in DC-DC Boost Converter||545 counts/V||40 counts/V|
|DC-DC Inductor Currents||ADC interface in DC-DC Boost Converter||717 counts/A||100 counts/A|
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