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MCC 172 IEPE Measurement DAQ HAT for Raspberry Pi Features Two IEPE inputs Two 24-bit, 51.2 kS/s A/D converters (one per channel) AC coupled at 5 V 10-32 and screw terminal connections for OEM support Synchronous ADC conversions between multiple boards Onboard sample buffers allow The MCC 172 is a 24-bit DAQ HAT for making sound and vibration measurements from high-speed acquisition IEPE sensors. The MCC 172 is shown connected to a Raspberry Pi (not included). External digital trigger input Stack up to eight MCC HATs Overview onto a single Raspberry Pi The MCC 172 is a voltage HAT (Hardware Attached on Top) board designed for use with Raspberry Pi, the most popular single-board computer on the market today. Software A HAT is an add-on board with a 40W GPIO (general purpose input/output) con- MCC DAQ HAT Library nector that conforms to the Raspberry Pi HAT specification. available on GitHub The MCC 172 HAT provides two analog inputs for sound or vibration measure- Supported Operating Systems ments. Up to eight MCC HATs can be stacked onto one Raspberry Pi. Linux /Raspbian Multiple HAT Synchronization Raspberry Pi Interface Programming API Multiple MCC 172 HATs can be synchro- The MCC 172 header plugs into the 40-pin C, C++, Python nized to a single sampling clock. The clock is general purpose I/O (GPIO) connector on a programmable for sampling rates between user-supplied Raspberry Pi. The MCC 172 51.2 kS/s to 200 S/s. was tested for use with all Raspberry Pi models with the 40-pin GPIO connector. OEM Support Sample Rates Users can connect analog input signals to HAT Configuration Single-board: max throughput is either the 10-32 coaxial inputs or to the 102.4 kS/s (51.2 kS 2 channels) screw terminals. Only one source may be HAT configuration parameters are stored connected to a channel at a time. in an on-board EEPROM that allows the Stacked boards: max throughput is Raspberry Pi to automatically set up the 1 307.2 kS/s aggregate . GPIO pins when the HAT is connected. MCC DAQ HAT Library The open-source MCC DAQ HAT Library Digital Trigger Stackable HATs of commands in C/C++ and Python The trigger input (terminal TRIG) is used Up to eight MCC HAT boards can be allows users to develop applications on to delay an input scan until a specified stacked onto a single Raspberry Pi. the Raspberry Pi using Linux. condition is met at the trigger input. Users can mix and match MCC HAT The library is available to download from The trigger input signal may be a 3.3V or models in the stack. GitHub. Comprehensive API and hard- 5V TTL or CMOS logic signal. The input ware documentation is available. condition may be edge or level sensitive, rising or falling edge, or high or low level. Analog Input The MCC DAQ HAT Library supports This terminal may be used to trigger the operation with multiple MCC DAQ HATs The two 24-bit differential analog input start of an acquisition on multiple syn- running concurrently. channels simultaneously acquire data at chronized MCC 172 HATs. rates up 51.2 kS/s. Users can turn IEPE Console-based and user interface (UI) excitation current on or off. example programs are available for each Power API. Each channel has a dedicated A/D con- The MCC 172 is powered with 5 V verter. Both ADCs share the same clock provided by the Raspberry Pi through the and are synchronized to start conversions GPIO header connector. at the same time for synchronous data. 1 Dependent on the load on the Raspberry Pi and the SPI interface. Measurement ComputingMeasurement Computing (508) 946-5100(508) 946-5100 info mccdaq.cominfo mccdaq.com mccdaq.commccdaq.com 11MCC 172 Block Diagram +5V IEPE Supply 3.3V Supply Clock 26.2144 MHz CH 0 Amp ADC Oscillator Clock Clock Master/ Slave IEPE 32-bit Board SPI Supply SPI Raspberry Pi Microcontroller Address Header Matching CH 1 Amp ADC I2C HAT EEPROM Trigger Trigger Bus Digital Master/ Trigger Slave Clock Bus Stackable Connect up to eight MCC DAQ HATs onto a single Raspberry Pi. Onboard jumpers identify each board in the stack. Measurement Computing (508) 946-5100 info mccdaq.com mccdaq.com 2