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Chapter 2

32

•

Threshold trigger

 – The start trigger event occurs when the signal attached to a specified 

analog input channel rises above or falls below a user-specified threshold value. Using 
software, you specify the following parameters:

−

Edge – Specify a rising-edge threshold trigger if you want to trigger when the signal 
rises above a threshold level, or a falling-edge threshold trigger if you want to trigger 
when the signal falls below a threshold level. 

−

Threshold channel – Specify any one of the analog input channels as the threshold 
input channel.

−

Threshold level – Specify a value between ±10 V for a gain of 1 or ±1 V for a gain of 10 
as the threshold level. Note that in software, this value must be entered as counts.

To convert raw counts to volts, use the following formulas:

Gain of 1:

volts 

= ((2.0f * 10.0f * 

counts

)/(1<<24) – 10.0f)

Gain of 10:

volts 

= ((2.0f * 

counts

)/(1<<24) – 1.0f)

Note:

The DT7837 driver sets the threshold level as close as possible to the value that you 

specify. However, the value that you specify may not be the actual value that is set. You 
can return the actual threshold level that was set using software.

Input Clock Source and Sampling Frequency

The DT7837 module supports an internal A/D clock, which is derived from the 48 MHz 
reference clock. The reference clock is generated from the onboard oscillator.

Using software, you specify the frequency at which to pace input operations. The sampling 
frequency can range from 195.3125 Hz to 105.469 kHz.

Note:

According to sampling theory (Nyquist Theorem), specify a frequency that is at least 

twice as fast as the input’s highest frequency component. For example, to accurately sample a 
20 kHz signal, specify a sampling frequency of at least 40 kHz to avoid aliasing.

The DT7837 driver sets the sampling frequency as close as possible to the value that you 
specify. However, the value that you specify may not be the actual value that is set. You can 
return the actual sampling frequency that was set using software.

Once the sample clock is started, the module requires 39 conversions before the first A/D 
sample is valid. The valid sample is aligned with the start trigger.

Содержание DT7837

Страница 1: ...DT7837 UM 26000 A User s Manual Title Page ...

Страница 2: ...rictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer software clause at 48 C F R 252 227 7013 or in subparagraph c 2 of the Commercial Computer Software Registered Rights clause at 48 C F R 52 227 19 as applicable Data Translation Inc 100 Locke Drive Marlboro MA 01752 The DT7837 software is based of the Linux open source development environment which uses the G...

Страница 3: ...ions to this equipment not expressly approved by Data Translation could void your authority to operate the equipment under Part 15 of the FCC Rules Note This product was verified to meet FCC requirements under test conditions that included use of shielded cables and connectors between system components It is important that you use shielded cables and connectors to reduce the possibility of causing...

Страница 4: ......

Страница 5: ...on 23 Block Diagram 24 ARM Block 25 ARM Processor 25 Memory 25 Embedded NAND Flash 25 EEPROM 25 Micro SD Card 26 USB Device Client Port 26 USB Host Port 26 Serial Port 0 26 Serial Port 1 I2C2 Port 26 SPI Port 27 GPMC Bus Interface 27 Additional Signals Used on Processor 27 Digital Connector 27 Analog Input Features 29 Analog Input Channels 29 Input Ranges and Gains 29 IEPE Functions 30 Input Resol...

Страница 6: ...t 50 If Your Module Needs Factory Service 51 Chapter 4 Calibration 53 Overview 54 Using the Calibration Utility 55 Calibrating the Analog Input Subsystem 56 Warming up the Module 56 Connecting a Precision Voltage Source 56 Using the Auto Calibration Procedure 56 Using the Manual Calibration Procedure 57 Restoring Factory Calibration Settings 58 Appendix A Specifications 59 Analog Input Specificati...

Страница 7: ...ors 75 Analog Input Connectors 76 Digital Connector 77 USB Device Client Connector 79 USB Host Connector 80 Ethernet Connector 81 Micro SD Card Connector 82 External 5 V Power Connector 83 Serial Connectors 85 Serial Port 0 UART 0 85 SPI Connector 86 Serial Port 1 I2C2 Connector 87 I O Block Connector 88 STP26 Screw Terminal Panel 91 LED Status Indicators 93 Index 95 ...

Страница 8: ...Contents 8 ...

Страница 9: ...ftware and accessories for the module Chapter 2 Principles of Operation describes all of the features of the DT7837 module Chapter 3 Troubleshooting provides information that you can use to resolve problems with the DT7837 module should they occur Chapter 4 Calibration describes how to calibrate the analog circuitry of the DT7837 module Appendix A Specifications lists the specifications of the DT7...

Страница 10: ...o your Linux documentation for more information about Linux and Texas Instruments documentation for more information on the TI Sitara AM3352 1 GHz ARM Cortex A8 processor Where To Get Help Should you run into problems installing or using a DT7837 module the Data Translation Technical Support Department is available to provide technical assistance Refer to Chapter 4 for more information If you are ...

Страница 11: ...11 1 Overview Hardware Features 12 Supported Software 18 Supported Accessories 19 Getting Started Procedure 21 ...

Страница 12: ...the I O block that connect together as show in Figure 1 Users can embed the module into their own enclosure and or system as needed Figure 1 DT7837 Module The key features of the DT7837 module are as follows Open source computing platform featuring a TI Sitara AM3352 1 GHz ARM Cortex A8 processor Linux distribution consisting of a Linux kernel bootloader and file system with a DT7837 device driver...

Страница 13: ...elay Up to eight TTL digital input lines using the eight general purpose inputs You can read the digital input port directly or you can return the value of the digital input port in the input data stream Up to eight TTL digital output lines using the eight general purpose outputs You can write a value to the digital output port directly One 32 bit general purpose counter timer for performing event...

Страница 14: ...Chapter 1 14 Serial debug port External power connectors 4 pin DIN or 3 pin Phoenix header for connecting a 5 VDC power supply ...

Страница 15: ...view 15 Board Layout Overview The DT7837 module consists of an ARM block and a I O block Figure 2 shows the layout of the ARM block the bottom board Figure 3 shows the layout of the I O block the top board ...

Страница 16: ...l Connector Tachometer Digital I O External Trigger Counter Timer Power LED Ethernet Connector USB Host Port USB Device Client Port SD Card 5 V Power AM3552 Processor Reset Boot Switch Connector to the I O Block Serial Port 1 J14 Serial Port 0 J13 SPI Port J12 Grounding Stud ...

Страница 17: ...iew 17 Figure 3 Layout of the I O Block of the DT7837 Module Output Trigger LED bottom Input Trigger LED top Analog Output Connector analog output currently not supported in software Analog Input Connectors ...

Страница 18: ...or writing values to the calibration potentiometers Numerous example programs are provided to illustrate how to use these commands Refer to the DT7837 File I O Programming Manual for more information DT7837 Kernel Device Driver The device driver resides in the Linux kernel and is responsible for performing the functions defined by the DT7837 file I O commands on the DT7837 module DT7837 Calibratio...

Страница 19: ...or on the module The 26 pin 36 inch EP406 cable is included with the STP26 screw terminal panel The cable allows you to attach the STP26 screw terminal panel to the Digital connector on a DT7837 module Figure 4 shows the STP26 and EP406 cable Figure 4 STP26 Screw Terminal Panel and EP406 Cable EP405 USB to Serial TTL Debug Cable This 3Mbaud 1 8 m cable shown in Figure 5 connects the USB port of th...

Страница 20: ...P361 External Power Supply This 5 VDC optional power supply and cable shown in Figure 6 connects to the DIN power connector on the DT7837 module and to the wall power outlet Figure 6 EP361 5 VDC External Power Supply ...

Страница 21: ...Overview 21 Getting Started Procedure Refer to the DT7837 Getting Started help file on our web site http www datatranslation com products dataacquisition embedded DT7837 for getting started information ...

Страница 22: ...Chapter 1 22 ...

Страница 23: ...Operation Block Diagram 24 Analog Input Features 29 Tachometer Input Features 34 General Purpose Counter Timer Features 36 Measure Counter Features 43 Digital I O Features 47 Triggering Acquisition on Multiple Modules 48 ...

Страница 24: ...stimulus analog output Note The analog output circuitry is currently not supported in software Figure 7 shows a block diagram of the DT7837 module Figure 7 Block Diagram of the DT7837 Module Serial UART Ethernet 10 100 USB 2 0 Host USB 2 0 Client SD Card DT7837 Block Diagram Four 24 Bit A D Inputs I O Block DRAM 512 MB DDR3 TI AM335x ARM Cortex A8 Clock Generators Voltage Regulators ARM Block GPMC...

Страница 25: ...ore information on this processor http www ti com product am3352 Memory A 512 MB DDR3 SDRAM memory device is connected to the AM3352 processor through a dedicated DDR Double Data Rate memory interface Embedded NAND Flash A 2 GB embedded NAND flash device is connected to the AM3352 processor through the 16 bit GPMC General Purpose Memory Controller bus and can be accessed at the CS0 address space T...

Страница 26: ... supports any USB device provided that the required software is installed on the Linux operating system If desired you can connect USB devices such as a keyboard mouse memory stick or hub to this port Serial Port 0 Serial port 0 is a 3 3 V TTL serial interface provided on a 6 pin header This port supports transmit and receive signals no handshaking and connects to the UART 0 interface of the AM355...

Страница 27: ... analog output DMA event currently not supported XDMAEvent2 Used for an analog input DMA event GPIO1_20 Configured for a DMA event but not used GPIO1_25 Configured as an interrupt but not used GPIO1_26 Configured as an interrupt but not used GPIO1_27 Configured as an interrupt but not used GPIO3_20 Configured as an interrupt but not used Digital Connector The Digital connector provides access to t...

Страница 28: ...r one of these destinations Digital output the default signal for each general purpose output pin Clock output for the general purpose counter timer C T 0 Note that a single general purpose input may drive several destinations at the same time However a single general purpose output can have only one driving source ...

Страница 29: ...ingle ended channels you can connect IEPE sensors to these inputs if desired refer to page 30 for more information on IEPE functions Note To maintain simultaneous operation all analog input connections on the DT7837 module must have the same lead lengths The DT7837 module uses four Delta Sigma 24 bit ADCs that provide anti aliasing filters based on the clock rate These filters remove aliasing whic...

Страница 30: ...s an asynchronous I O operation that is non blocking so that your application can perform other operations while acquisition is being performed In continuous sampling mode you can acquire data from the following channels in the input data stream analog input channels 0 to 3 the tachometer input the general purpose counter timer the measure counter and the digital input port In software you specify...

Страница 31: ... are acquired continuously Figure 8 Continuous Sampling Mode on the DT7837 Module Input Triggers A trigger is an event that occurs based on a specified set of conditions For continuous sampling mode of the channels in the input data stream described on page 30 you must specify a start trigger to start acquisition The DT7837 module supports the following sources for the start trigger you configure ...

Страница 32: ...ecify However the value that you specify may not be the actual value that is set You can return the actual threshold level that was set using software Input Clock Source and Sampling Frequency The DT7837 module supports an internal A D clock which is derived from the 48 MHz reference clock The reference clock is generated from the onboard oscillator Using software you specify the frequency at whic...

Страница 33: ...ice is configured to complete the calibration process Data Format and Transfer The DT7837 has an input FIFO of 2 kSamples 8 kBytes Each sample of the DT7837 is a 32 bit value The DT7837 module uses offset binary data encoding where 000000 represents negative full scale and FFFFFFh represents positive full scale Use software to specify the data encoding as binary The ADC outputs FFFFFFh for above r...

Страница 34: ...e of the tachometer input and stops incrementing when it detects the next starting edge at that point the counter stores the count The stored count is maintained until it is read as part of the input data stream or until a new count is stored The next tachometer measurement operation is started automatically If the sample rate of the input subsystem is faster than the tachometer input frequency th...

Страница 35: ...600 kHz 12 MHz 20 Period of a signal pulse You can calculate the period as follows Period 1 Frequency Period Number of counts 1 12 MHz where 12 MHz is the internal counter timer clock frequency Table 1 An Example of Reading the Tachometer Input as Part of the Analog Input Data Stream Time A D Value Tachometer Input Value Status of Operation 10 5002 0 Operation started but is not complete 20 5004 0...

Страница 36: ... bit general purpose counter timer C T 0 As shown in Figure 9 the counter timer accepts a clock input and gate input signal and outputs a pulse clock output signal Figure 9 Counter Timer Channel Using software you define general purpose I O pins on the Digital connector for the external C T clock input external C T gate input and C T clock output signals To read the value of C T 0 in the input str...

Страница 37: ... sample clock Gate Types The edge or level of the counter gate signal determines when a counter timer operation is enabled Unless you are using a software gate no gate define one of the general purpose input pins of the Digital connector on the DT7837 module as the external C T gate input using software Then physically connect the external gate signal to the selected pin Refer to page 27 for the p...

Страница 38: ...pin Refer to page 27 for the pin descriptions of the Digital connector For the DT7837 module you can program the polarity of the output pulse active high or active low For an active high pulse the high portion of the total pulse output period is the active portion of the counter timer pulse output signal For an active low pulse the low portion of the total pulse output period is the active portion...

Страница 39: ...a maximum of 4 294 967 296 events before the counter rolls over to 0 and starts counting again Using software you must specify the following parameters for the event counting operation Active gate type external low level or external high level Refer to page 37 for more information about the supported gate types The general purpose input pin to use for the external gate signal Ensure that you physi...

Страница 40: ...ut pin to use for the external gate signal Ensure that you physically connect the gate signal to this input pin Refer to page 27 for the pin descriptions of the Digital connector The C T clock source internal or external Refer to page 37 for more information about the C T clock sources If you are using an external C T clock source the general purpose input pin to use for the external C T clock inp...

Страница 41: ...supported gate types The general purpose input pin to use for the external gate signal Ensure that you physically connect the gate signal to this input pin Refer to page 27 for the pin descriptions of the Digital connector The C T clock source internal or external that generates the pulse Note that in one shot mode the internal C T clock is more useful than an external C T clock refer to page 37 f...

Страница 42: ...fer to page 41 for an example of connecting a non repeatable one shot application Idle Mode If you use idle mode the counter no longer drives the clock output signal that is assigned to one of the general purpose output signals pins 11 to 18 of the Digital connector Note The value of the counter output signal can also be overwritten by writing to the digital output subsystem If you assigned a gene...

Страница 43: ...ut or C T gate input to general purpose input 1 pin 2 of the Digital connector By default this is digital input 1 Digital input 2 falling edge or rising edge Connect a digital input external A D trigger C T clock input or C T gate input to general purpose input 2 pin 3 of the Digital connector By default this is digital input 2 Digital input 3 falling edge or rising edge Connect a digital input ex...

Страница 44: ...ag is used then the Stale flag is set and the stale measure count is written into the input data stream If another input subsystem sample occurs before another measure completes and the Stale flag is not used then the Stale flag is not set and the stale measure count is written into the input data stream If the input subsystem sample frequency is slower than the selected input frequency then the n...

Страница 45: ...g the count that is returned from the measure counter you can determine the following Frequency between the start and stop signals edges You can calculate the frequency as follows Frequency 48 MHz Number of counts 1 where 48 MHz is the internal measure counter frequency For example if the count is 201 the measured frequency is 240 kHz 48 MHz 200 Period between the start and stop signals edges You ...

Страница 46: ...art and stop signal edges rising to falling edge or falling edge to rising edge You can calculate the period as follows Pulse width 1 Frequency Pulse width Number of counts 1 48 MHz where 48 MHz is the internal measure counter frequency ...

Страница 47: ...rrupt the signal on the pin A digital line is high if its value is 1 a digital line is low if its value is 0 On power up or reset a low value 0 is output from each of the digital output lines and a high value 1 is read from each of the digital input lines if the lines are not connected Operation Modes DT7837 modules support the following digital I O operation modes Synchronous read and write opera...

Страница 48: ...e 12 Using software you must define one of the general purpose input pins on the Digital connector on each DT7837 module as the external trigger signal When triggered the modules start acquiring data at the same time Using this connection scheme the measurements of one module are not synchronous with the measurements of another module as they do not share the same reference clock Figure 12 Trigger...

Страница 49: ...49 3 Troubleshooting Technical Support 50 If Your Module Needs Factory Service 51 ...

Страница 50: ...u are still having difficulty using the DT7837 module Data Translation s Technical Support Department is available to provide technical assistance To request technical support go to our web site at http www datatranslation com and click on the Support link When requesting technical support be prepared to provide the following information Your product serial number The hardware software product you...

Страница 51: ...lation com for the name and telephone number of your nearest distributor All return shipments to Data Translation must be marked with the correct RMA number to ensure proper processing 2 Using the original packing materials if available package the module as follows Wrap the module in an electrically conductive plastic material Handle with ground protection A static discharge can destroy component...

Страница 52: ...Chapter 3 52 ...

Страница 53: ...53 4 Calibration Overview 54 Using the Calibration Utility 55 Calibrating the Analog Input Subsystem 56 ...

Страница 54: ...ecessary readjust the calibration of the analog circuitry every six months using the DT7837 Calibration Utility The DT7837 Calibration Utility is provided as both a web application cal server and a command line program dt7837cal This chapter describes how to calibrate the analog input subsystem of a DT7837 module using the command line program dt7837cal ...

Страница 55: ...ollowing steps 1 From the usr local dt7837 dt7837 calibration directory on the module type dt7837cal and press Enter The main screen of the DT7837 Calibration Utility appears 2 Once the calibration utility is running calibrate the analog input circuitry either automatically or manually as described on page 56 ...

Страница 56: ...n method To auto calibrate the analog input subsystem do the following 1 From the main menu of the program select 2 Automatically calibrate an analog input channel 2 Enter the number 0 to 3 of the analog input channel that you want to calibrate then enter Y to continue 3 Verify that 0 0000 V is applied to the channel that you want to calibrate 4 Adjust the value to 0 0000 V by typing a value betwe...

Страница 57: ... equal to 52734 Hz or 1 to calibrate the selected potentiometer for sampling frequencies greater than 52734 Hz The current calibrations selections are displayed 6 If the current selections are correct enter Y To fix an entry enter N to repeat these steps 7 If you chose to calibrate the offset potentiometer in step 4 adjust the potentiometer as follows a Verify that 0 0000 V is applied to the chann...

Страница 58: ...9b and 9c until the reading is calibrated to 0 9375 V e Press x to exit to the main menu 10 Repeat these steps for each gain and sampling frequency for the selected channel 11 Repeat these steps for each analog input channel 12 When you have finished calibrating the module press X from the main menu to exit from the program Restoring Factory Calibration Settings If you wish you can restore the ana...

Страница 59: ...ometer Input Specifications 65 Measure Counter Specifications 66 General Purpose Counter Timer Specifications 67 Trigger Specifications 68 Master Oscillator Specifications 69 Power Physical and Environmental Specifications 70 Regulatory Specifications 71 Connector Specifications 72 External Power Supply Specifications 73 ...

Страница 60: ...ck range Sampling frequency 52 734 kHz 52 734 kHz to 105 469 kHz 100 kHz to 27 MHz 512 x sample frequency 256 x sample frequency Group delay 39 sample rate in seconds ADC Delta Sigma filtera Passband 3 dB Passband ripple 0 005 dB Stopband 100 dB 0 49 x sample frequency Hz 0 453 x sample frequency Hz 0 547 x sample frequency Hz Analog filtera Low pass cutoff 3 dB High pass cutoff 3 dB AC coupling 4...

Страница 61: ...t 6 dBFS input 97 dB 96 dB 97 dB 96 dB Total Harmonic Distortion THDi 1 kHz input 105 5 kSPS 1 dBFS input 6 dBFS input 102 dB 100 dB 102 dB 101 dB Spurious Free Dynamic Range SFDRj 1 kHz input 105 5 kSPS 1 dBFS input 6 dBFS input 97 dBFS 103 dBFS 98 dBFS 102 dBFS Noise Floor 50 Ω input termination 105 5 kSPS 56 μVRMS 65 μVRMS Overvoltage Protection Overvoltage protection Power on Power off 40 V to...

Страница 62: ...Noise and Distortion SINAD is the ratio of the RMS value of the input signal to the RMS sum of all other spectral components excluding DC h Signal to Noise Ratio SNR is the ratio of the RMS value of the input signal to the RMS sum of all other spectral components excluding harmonics and DC i Total Harmonic Distortion THD is the ratio of the RMS value of the input signal to the RMS sum of all harmo...

Страница 63: ...5 Digital Input Specifications Feature Specifications Number of general purpose inputs 8 Input type 3 3 V high speed CMOS Schmitt trigger 5 V tolerant Input termination 22 1 kΩ pull up resistor to 3 3 V Voltage threshold 2 0 V typical Voltage threshold 0 8 V typical Clocked with sample clock Yes if the digital input port is included in the input data stream channel bit 7 ...

Страница 64: ...ule Table 6 Digital Output Specifications Feature Specifications Number of general purpose outputs 8 Output type LVTTL Logic high output voltage 2 4 V minimum Logic low output voltage 0 4 V maximum Logic high output current 10 mA maximum Logic low output current 4 mA maximum Short circuit current 50 mA maximum Clocked with sample clock Currently not supported ...

Страница 65: ... Input voltage range 30 V Threshold voltage 2 V with 0 5 V hysteresis Input termination None Maximum input frequency 1 MHza a Limited by signal integrity and input signal conditioning Minimum pulse width high low minimum amount of time it takes a C T to recognize an input pulse 0 4 μs Clock frequency for tachometer measurements 12 MHz 83 ns resolution Overvoltage protection 30 V Clocked with sampl...

Страница 66: ... input frequency 10 MHza a Limited by signal integrity and input signal conditioning Minimum pulse width high low 50 ns 0 4 μs if the tachometer input is used for the starting edge and stopping edge Start and stop signals edges A D conversion complete Tachometer input falling or rising edge Digital inputs 0 to 7 falling or rising edge C T 0 Clock input falling or rising edge C T 0 Gate input falli...

Страница 67: ...imer outputs General purpose outputs 11 to 18 on the Digital connector Resolution 32 bits per channel Clock divider Minimum Maximum 2 4 294 967 296 Clock output Minimum Maximum 0 0112 Hz 24 MHz Maximum clock or gate input frequency 24 MHza a The integrity of the signal degrades at frequencies greater than 10 MHz Minimum pulse width minimum amount of time it takes a C T to recognize an input pulse ...

Страница 68: ... inputs 0 to 3 External trigger digital Trigger type Input type Input termination Voltage threshold Voltage threshold Minimum pulse width high low Overvoltage protection Edge sensitive rising or falling edge trigger software selectable 3 3 V high speed CMOS Schmitt trigger 5 V tolerant 22 1 kΩ pull up resistor to 3 3 V 2 0 V 0 8 V 250 ns 30 V Threshold trigger Trigger type Threshold level Hysteres...

Страница 69: ...r oscillator on the DT7837 module Table 11 Master Oscillator Specifications Feature Specifications Frequency 48 MHz Frequency stability 30 ppma a Stability budget consists of initial tolerance operating temperature range rated power supply voltage change load change 10 year aging shock and vibration ...

Страница 70: ...ical and Environmental Specifications Feature DT7837 Specifications Power 5 VDC 2 A maximum Warm up time 1 hour Physical Dimensions Depth Width Height Weight 6 28 in 159 5 mm 3 937 in 100 mm 1 30 in 33 mm 7 2 oz 204 g Environmental Operating temperature range Storage temperature range Relative humidity Altitude 0 C to 55 C 25 C to 85 C To 95 noncondensing To 10 000 feet ...

Страница 71: ...Measurement Control and Laboratory Use EMC Requirements EN61000 4 2 2009 Electrostatic Discharge ESD 4 kV contact discharge 8 kV air discharge 4 kV horizontal and vertical coupling planes EN61000 4 3 2006 Radiated electromagnetic fields 3 V m 80 to 1000 MHz 3 V m 1 4 GHz to 2 GHz 1 V m 2 GHz to 2 7 GHz EN61000 4 4 2004 Electrical Fast Transient Burst EFT 1 kV on data cables EN61000 4 6 2009 Conduc...

Страница 72: ...l Connex 132203 Ethernet RJ45 connector J1 on ARM block Bothhand LU1S041C 43 LF USB host connector J2 on ARM block TE Connectivity 292336 1 USB device client connector J4 on ARM block TE Connectivity 292304 2 MicroSD connector J5 on ARM block Molex 503182 1853 External power supply DIN connector 3 Pin header J6 on ARM block TB1 on ARM block Kycon KPJX 4S S Phoenix Contact 1707434 Kycon KPPX 4P Pho...

Страница 73: ...pply Used with the DIN Connector on the DT7837 Module Feature Specifications Type Total Power medical power supply TPEMG24 S050400 7 Input voltage Typical 90 264 V AC Input current Typical 0 347 A at 115 V AC 0 215 A at 230 V AC Frequency 47 to 63 Hz Inrush current 6 274 A RMS at 230 V AC Output voltage 5 V DC Output current 4 0 A Output wattage Typical 20 24 W Noise and ripple 1 peak to peak Regu...

Страница 74: ...at is used with the 3 position header on the DT7837 module Table 16 Specifications for the External Power Supply Used with the 3 Position Header on the DT7837 Module Feature Specifications Output voltage 5 VDC to Output current 2 A with 4 A surge capability Noise and ripple 50 mVpp ...

Страница 75: ...t Connectors 76 Digital Connector 77 USB Device Client Connector 79 USB Host Connector 80 Ethernet Connector 81 Micro SD Card Connector 82 External 5 V Power Connector 83 Serial Connectors 85 I O Block Connector 88 STP26 Screw Terminal Panel 91 LED Status Indicators 93 ...

Страница 76: ...nput Connectors Figure 13 shows the layout of the analog input SMA connectors connectors J1 J5 on the I O block top board of the DT7837 module Figure 13 Analog Input Connectors Channel n Analog In Channel n Analog In Return ...

Страница 77: ...configured as digital input signals 14 General Purpose Output 3b 2 General Purpose Input 1a 15 General Purpose Output 4b 3 General Purpose Input 2a 16 General Purpose Output 5b 4 General Purpose Input 3a 17 General Purpose Output 6b 5 General Purpose Input 4a 18 General Purpose Output 7b 6 General Purpose Input 5a 19 Digital Ground 7 General Purpose Input 6a 20 Digital Ground 8 General Purpose Inp...

Страница 78: ...imer C T 0 Clock input for the general purpose counter timer C T 0 Using software you can specify a general purpose output signal as the signal source for one of these destinations Digital output the default signal for each general purpose output pin Clock output for the general purpose counter timer C T 0 Note that a single general purpose input may drive several destinations at the same time How...

Страница 79: ...he USB Type B Connector for the USB Device Client Port Table 18 lists the pin assignments for the USB type B connector on the DT7837 module for the USB device client port Note The outer shell provides cable shield to chassis ground Table 18 Pin Assignments for the USB Type B Connector for the USB Device Client Port Connector Pin Number Signal Description Connector Pin Number Signal Description 1 U...

Страница 80: ...or for the USB Host Port Table 19 lists the pin assignments for the USB type A connector on the DT7837 module for the USB host port Note The outer shell provides cable shield to chassis ground Table 19 Pin Assignments for the USB Type B Connector for the USB Device Client Port Connector Pin Number Signal Description Connector Pin Number Signal Description 1 USB 5 V 3 USB Data 2 USB Data 4 USB Grou...

Страница 81: ...0 lists the pin assignments for the Ethernet connector on the DT7837 module Note The outer shell provides cable shield to chassis ground Table 20 Pin Assignments for the Ethernet Connector Connector Pin Number Signal Description Connector Pin Number Signal Description 1 Transmit 5 Not connected 2 Transmit 6 Receive 3 Receive 7 Not connected 4 Not connected 8 Not connected LED1 Activity green LED2 ...

Страница 82: ... lists the pin assignments for the Micro SD card connector on the DT7837 module Table 21 Pin Assignments for the Micro SD Card Connector Connector Pin Number Signal Description Connector Pin Number Signal Description 1 DAT2 9 CD 2 DAT3 CD 10 DGND 3 CMD 11 CGND 4 3 3 V 12 CGND 5 CLK 13 CGND 6 DGND 14 CGND 7 DAT0 15 CGND 8 DAT1 Bottom View Card Detect Switch 8 7 6 5 4 3 2 1 9 10 11 12 13 14 15 ...

Страница 83: ...om board of the DT7837 Figure 19 Layout of the DIN Power Connector Table 22 lists the pin assignments for the external DIN power connector on the DT7837 module You can connect the optional EP361 power supply to the DIN connector if desired Refer to page 72 and page 73 for detailed specifications of this power supply Table 22 Pin Assignments for the External Power Connector Connector Pin Number Sig...

Страница 84: ...ists the terminal assignments for the 3 position header on the DT7837 module Note that you must connect an external power supply to this header that meets the specifications described on page 74 Table 23 Terminal Assignments for the 3 Position Header TB1 on the DT7837 Module Terminal Number Signal Description 1 5 VDC 2 Digital Ground 3 Chassis Ground Terminal 1 Terminal 2 Terminal 3 ...

Страница 85: ...e Figure 21 Layout of the Serial Connectors These connectors are described in the sections that follow Serial Port 0 UART 0 Figure 15 shows the layout of the Serial port 0 J13 on the ARM block bottom board of the DT7837 module Figure 22 Layout of Serial Port 0 J13 Serial Port 1 I2 C2 Port Serial Port 0 SPI Port 6 1 Note that the pin order of connector J13 is reversed from connectors J12 and J14 ...

Страница 86: ...nector J12 Table 25 lists the pin assignments for the SPI connector on the DT7837 module Table 24 Pin Assignments for Serial Port 0 J13 on the DT7837 Module Connector Pin Number Signal Description 1 DGND 2 Not Connected 3 Not Connected 4 UART0_RX 5 UART0_TX 6 Not Connected Table 25 Pin Assignments for SPI Connector J12 on the DT7837 Module Pin Number Signal Description 1 SPI1_D0 2 SPI1_SCLK 3 SPI1...

Страница 87: ...ARM block bottom board of the DT7837 module Figure 24 Layout of Serial Port 1 I2 C Port J14 Table 26 lists the pin assignments for the Serial port 1 I2 C connector on the DT7837 module Table 26 Pin Assignments for Serial Port 1 I2 C Connector J14 on the DT7837 Module Pin Number Signal Description 1 UART1_RX 2 UART1_TX 3 I2 C2_SDA 4 I2 C2_SCL 5 DGND 6 3 3 V 1 6 ...

Страница 88: ...19 1 3 5 7 9 31 33 35 37 39 21 23 25 27 29 51 53 55 57 59 41 43 45 47 49 71 73 75 77 79 61 63 65 67 69 91 93 95 97 99 81 83 85 87 89 111 113 115 117 119 101 103 105 107 109 12 14 16 18 20 2 4 6 8 10 32 34 36 38 40 22 24 26 28 30 52 54 56 58 60 42 44 46 48 50 72 74 76 78 80 62 64 66 68 70 92 94 96 98 100 82 84 86 88 90 112 114 116 118 120 102 104 106 108 110 ...

Страница 89: ... LED 1 15 LED 2 16 LED 3 17 LED 4 18 LED 5 19 LED 6 20 LED 7 21 DC DC Sync 0 22 DC DC Sync 1 23 Ground 24 Ground 25 I2 C SLC 0 26 I2 C SLC 1 27 I2 C SDA 0 28 I2 C SDA 1 29 Ground 30 Ground 31 Write Enable 0 32 Write Enable 1 33 Read Enable 0 34 Read Enable 1 35 In Sync Control 0 36 In Sync Control 1 37 In Sync Control 2 38 In Sync Control 3 39 Ground 40 Ground 41 DAQ Clock 0 42 DAQ Clock 1 43 DAQ ...

Страница 90: ...rol 13 91 Control 14 92 Control 15 93 Ground 94 Ground 95 Out Parallel Data 0 96 Out Parallel Data 1 97 Out Parallel Data 2 98 Out Parallel Data 3 99 Out Parallel Data 4 100 Out Parallel Data 5 101 Out Parallel Data 6 102 Out Parallel Data 7 103 Ground 104 Ground 105 Out Serial Data 0 106 Out Serial Data 1 107 Out Serial Data 2 108 Out Serial Data 3 109 Out Serial Data 4 110 Out Serial Data 5 111 ...

Страница 91: ...and a screw terminal block TB1 The 26 pin connector provides access to the signals from the Digital connector on the DT7837 module Figure 26 shows the layout of the STP26 screw terminal panel Figure 26 Layout of the STP26 Screw Terminal Panel Table 28 lists the screw terminal assignments for the STP26 screw terminal panel ...

Страница 92: ...und 18 General Purpose Output 7 17 General Purpose Output 6 16 General Purpose Output 5 15 General Purpose Output 4 14 General Purpose Output 3 13 General Purpose Output 2 12 General Purpose Output 1 11 General Purpose Output 0 10 Digital Ground 9 Digital Ground 8 General Purpose Input 7 7 General Purpose Input 6 6 General Purpose Input 5 5 General Purpose Input 4 4 General Purpose Input 3 3 Gener...

Страница 93: ...ion Input Trigger LED Off Idle Solid amber Input subsystem armed it is waiting for an external digital trigger or threshold trigger the module must have been configured for one of these trigger types Solid green Input subsystem has been triggered Output Trigger LED Off Idle Solid amber Output subsystem armed it is waiting for an external digital trigger or threshold trigger the module must have be...

Страница 94: ...Appendix B 94 ...

Страница 95: ... 36 digital I O 47 digital input 47 measure counter 43 tachometer 34 client port USB 26 clock sources analog input 32 counter timer 37 connectors 5 V power 83 analog input 76 digital 77 Ethernet 81 I O block 88 I2C2 87 micro SD card 82 serial 85 serial port 0 85 serial port 1 87 SPI 86 USB client 79 USB host 80 conversion rate 31 counter timer channels 36 clock sources 37 gate types 37 specificati...

Страница 96: ...2 IEPE features 30 input channels 29 ranges 29 resolution 30 Input Trigger LED 93 internal C T clock 37 internal sample clock 32 K kernel device driver 18 L LED status indicators 93 Input Trigger 93 Output Trigger 93 Power 93 lines digital I O 47 M master oscillator 32 specifications 69 measure counter features 43 specifications 66 memory 25 micro SD card 26 connector 82 N NAND flash 25 non repeat...

Страница 97: ...or the 3 position header 74 master oscillator 69 physical 70 power 70 regulatory 71 tachometer input 65 triggers 68 SPI connector 86 SPI port 27 start trigger external digital TTL trigger 31 software 31 threshold trigger 32 STP25 screw terminal panel 91 STP26 screw terminal panel 19 91 T tachometer input features 34 specifications 65 technical support 50 threshold trigger 32 transferring input dat...

Страница 98: ...Index 98 ...

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