Flexible Interface (PRU-ICSS) Reference Design for Simultaneous, Coherent DAQ Using Multiple ADCs

(ACTIVE) TIDA-01555

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Key Document

Description

This reference design showcases an interface implementation for connecting multiple high voltage bipolar input, 8-channel, mux-input SAR ADCs (6) with the Sitara Arm processors for expanding the number of input channels using Programmable Real-time Unit (PRU-ICSS). ADCs are configured for simultaneous sampling of the same channels across all ADCs. The design highlights the capability of PRU-ICSS to handle 1536ksps (each sample = 16 bits) data rate by sampling 640 samples per line cycle. For 50Hz cycle, this corresponds to 32ksps per channel across 6 ADCs simultaneously (640 samples/cycle*50Hz*6 ADCs*8 Ch = 1536ksps). Also, the second PRU is used to post process the data to achieve coherent sampling.

Features
  • Flexible interface using PRU-ICSS (Sitara Processor) for communicating with multiple SAR ADCs
  • AC voltage and current measurement accuracy:
    • AC Voltage: <±0.2% for 2.5V to 120V
    • AC Current: <±0.2% for 2.5A to 70A
    • Simultaneous sampling across six ADCs (16-bit, 500ksps/ADC)
  • PRU-ICSS Interface:
    • Programmable real-time unitiIndustrial communication subsystem (PRU-ICSS) offers flexible data capture for channel expansion
    • Firmware-based approach allows for reuse across different Sitara processors
    • Coherent sampling is achieved by computing line cycle in software and by adjusting CS signal

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Bill of Materials (BOM)

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TI Devices (14)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8688  16-Bit 500kSPS 8-Channel Single-Supply SAR ADC With Bipolar Input Ranges  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
AM3356  Sitara Processor: Arm Cortex-A8, PRU-ICSS  Sitara processors  Sample & Buy View Design Kits & Evaluation Modules
AM3357  Sitara Processor: Arm Cortex-A8, EtherCAT, PRU-ICSS  Sitara processors  Sample & Buy View Design Kits & Evaluation Modules
AM3358  Sitara Processor: Arm Cortex-A8, 3D Graphics, PRU-ICSS  Sitara processors  Sample & Buy View Design Kits & Evaluation Modules
AM3359  Sitara Processor: Arm Cortex-A8, EtherCAT, 3D, PRU-ICSS  Sitara processors  Sample & Buy View Design Kits & Evaluation Modules
CDCLVC1106  Low Jitter, 1:6 LVCMOS Fan-out Clock Buffer  Clock buffers  Sample & Buy View Design Kits & Evaluation Modules
LP2992  Micropower 250 mA Low-Noise Ultra Low-Dropout Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
OPA4197  36-V, Precision, Rail-to-Rail Input Output, Low Offset Voltage Op Amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
SN74LV1T04  Single Power Supply INVERTER Gate logic level shifter  Voltage level translation  Sample & Buy Not Available
SN74LVC1G17  Single Schmitt-Trigger Buffer  Buffer/driver  Sample & Buy View Design Kits & Evaluation Modules
TPS22914  5.5V, 2A, 38mΩ Load Switch  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS65131  Split-Rail Converter with Dual, Positive and Negative Outputs (750mA typ)  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A39  Dual, 150mA, Wide-Vin, Positive and Negative Low-Dropout (LDO) Voltage Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A65-Q1  300-mA, 40-V, Low-Dropout Regulator With 25-μA Quiescent Current  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
AM3356 NFBGA (ZCE)| 298 Download
Download Download
AM3357 Download Download
AM3358 NFBGA (ZCE)| 298 Download
Download Download
AM3359 Download Download
CDCLVC1106 Download -
LP2992 Download Download
Download Download
OPA4197 Download
SN74LV1T04 Download Download
Download Download
SN74LVC1G17 Download -
Download -
Download Download
Download Download
Download
Download Download
Download Download
Download Download
TPS65131 Download Download
TPS7A39 Download Download
TPS7A65-Q1 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

Application notes (1)
Title Abstract Type Size (KB) Date Views
PDF 1042 17 Apr 2018 0
User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1929 03 Jan 2019 0
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 7628 20 Dec 2017 0
ZIP 5446 20 Dec 2017 0
ZIP 4674 20 Dec 2017 0
ZIP 733 20 Dec 2017 0
ZIP 400 20 Dec 2017 0
ZIP 1659 20 Dec 2017 0
Related Tools & Software

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
BeagleBone Black Development Board  BEAGLEBK  Evaluation Modules & Boards 

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