ScioSense GPX2-EVA-KIT Manuel utilisateur
GPX2-
EVA-KIT
TDC-GPX2 Evaluation Kit
SC-001264-UG User Guide
GPX2-EVA-Kit User Guide
Revision: 5
Release Date: 2021-01-25
PUBLIC INFORMATION
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GPX2-EVA-Kit User Guide SC-001264-UG-5 / 2021-01-25 / Product
Content Guide
Content Guide ..................................... 2
1Introduction.............................. 3
1.1 Ordering Information .................... 3
2Quick Start Guide ........................ 4
2.1 Install the Software ...................... 4
2.2 Install the Hardware: .................... 5
2.3 Software.................................. 5
3Hardware Description ................... 5
3.1 Introduction.............................. 5
3.2 Input Signals lines ....................... 6
3.2.1 CMOS Inputs............................................ 7
3.2.2 LVDS Inputs ............................................. 7
4Software Description..................... 7
4.1 Main Window, REFCLK Page ............. 7
4.2 STOP Page ................................ 9
4.3 Interface Page ...........................10
4.4 Avoiding Configuration Conflicts .......10
4.5 Register Content ........................12
4.6 Graph Window...........................13
4.7 Known Errors ............................14
5Schematics, Layers and BOM ...........15
6Copyrights & Disclaimer ................22
7Document Status........................23
8Revision Information....................23
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1Introduction
The GPX2-EVA-KIT evaluation system is designed as a platform for a quick and easy start of
evaluation of the TDC-GPX2 time-to-digital converter. The kit offers a graphical user interface for
user-friendly configuration and extensive testing of the TDC-GPX2. For a proper use of the
evaluation system, we strongly recommended to refer to the latest TDC-GPX2 datasheet.
Features are:
•PC supported system with USB communication interface
•Easy to use evaluation and measurement software
•Different power options, selectable by jumpers
•Three reference clock sources for alternate clock options
•Data collection to ASCII text files
•Visualization of measurement results
Figure 1: Kit Content
Pos.
Item
Comment
1
PICOPROG V3.0
Programmer and interface
2
GPX2-EVA BOARD
Based on TDC-GPX2, V1.0
3
High density DSUB15 cable
Connecting Evaluation board to programmer
4
USB cable
Connects PicoProg V3.0 to PC
1.1 Ordering Information
Ordering Code
Part Number
Description
GPX2-EVA-KIT
220310001
TDC-GPX2 Eval Kit for QFN40 version including
PICOPROG and cables
GPX2-EVA-BOARD
220310003
TDC-GPX2 evaluation board for QFN64
1
2
3
4
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2Quick Start Guide
This section describes how to set up the GPX2-EVA-KIT, establish basic operation and make
measurements quickly.
2.1 Install the Software
Please download the latest software for the kit from:
Link: https://downloads.sciosense.com/tdc-gpx2/
It is crucial to install the software before connecting the evaluation kit to your computer. A default
driver loading of your OS may interfere with correct installation.
Figure 2: Installation steps
Step
Screen
Download the latest software installation
package to the desired directory.
Unzip the package to the desired directory.
Open “setup.exe” from the unzipped directory.
Follow the instructions on the screen.
When connecting the PicoProg to the USB port
it will be listed first as “picoprog v2.0 un-
programmed” device.
This is true also for PicoProg V3.0.
Starting the software will download a special
firmware into the PICOPROG,
picoprog_gpx2_v005.hex or higher, and the
device will now be listed as “UNIPRO”:
St Open the START Menu and open the
software from
C:\Program files\…\GPX2\GPX2 Frontpanel
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2.2 Install the Hardware:
•Make sure software is installed correctly before proceeding with this step!
•Connect your computer with the PicoProg V3.0 using USB cable.
•Connect PicoProg V3.0 and the evaluation kit motherboard using the DB15
interfaces or directly.
•Connect the power supply. Make sure it is set to 6 V supply voltage.
•The green LED on the evaluation kit should be on.
•Connect your signal source.
2.3 Software
•Execute the GPX2 Frontpanel Software. The communication status should be green
•The software starts with an initial configuration, that can be opened the default
configuration file config_default.cfg.
•Press “Power On Reset! – “Write Config” – “Init Reset”
•Press “Start Measurement”
The measurement should run and results should be displayed now.
3Hardware Description
3.1 Introduction
An on-board FPGA [1] manages the communication to the TDC-GPX [2]. It writes the configuration
into the chip via the SPI interface and can use the same to read data. In addition, the FPGA
manages the readout from the serial LVDS outputs of the TDC-GPX2. The SPI signals are available
via additional pads [3]. A jumper selects the supply voltage as 3.0 V, 3.3 V or 3.6 V [4]. A separate
jumper allows measuring the current into the TDC-GPX2 [5].
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Figure 3: GPX2-EVA-BOARD
Solder pads are prepared to apply an external oscillator. This may be used as a reference instead of
the RefClk input. [6]
Further, solder pads are available to connect the signal lines. Here the user may solder cables
directly, apply pin connectors, or in case of CMOS signals pads for SMB connectors are prepared.
Note: The FPGA manages the SPI communication and blocks the lines. Therefore, if you want to
communicate directly with TDC-GPX2 via SPI [3] then remove 0Ohm resistors R75, R76 and R77 first
[7].
3.2 Input Signals lines
The board is prepared to connect directly CMOS input signals or LVDS signals.
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Figure 4: Input section
CMOS In
CMOS GND
LVDS
P/N In
LVDS
GND
10R
CMOS
100k
LVDS
100R
N.c.
LVDS
3.2.1 CMOS Inputs
On the board there is a 10 Ohm series resistor.
3.2.2 LVDS Inputs
On the board there are 100kOhm pull-up resistors to TVDD33. The resistors interconnecting P and
N inputs are not assembled.
4Software Description
4.1 Main Window, REFCLK Page
The software will start with the following main window:
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Figure 5: GPX2 evaluation software main window
The main menu offers the typical functions to load and save configurations, to run a measurement,
to open the graph and register windows as well as a help.
The two figures on the right indicate the communication status. Both bar indicators should be
green.
Figure 6: Menu selections
As a first step we recommend to load the standard configuration config_default.cfg, then press
“Power On Reset”, “Write Config” and “Init Reset”.
The first page, “REFCLK”, allows the user to select the reference input as well as the definition of
the LSB. REFCLK_DIVISIONS defines the LSB at the output interface as fraction of the reference
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clock period. The most convenient way is applying an LSB of 1ps by configuring REFCLK_DIVISIONS
to the picosecond value of the reference clock period.
In the middle section the user selects between CMOS and LVDS.
At the bottom, visible on all tabulators, is the numerical display of the measurement results STOP1
to STOP2. In addition, the software allows to calculate the difference between two stop results.
The select box “Math” defines the formula:
Calculation Formula:
•On: [STOP1 - STOP2]
•Off: [REFNO1 - REFNO2] * REFCLK_DIVISIONS + [STOP1 - STOP2]
Various software filters, sinc or median, can be applied.
4.2 STOP Page
This page is for the PIN and HIT enable selection as well as the high resolution and combined
channel settings.
Figure 7: STOP page
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4.3 Interface Page
On this page the communication as well as the output data format is defined. In any case, on the
evaluation kit all communication is done via the on-board FPGA.
Figure 8: Interface page
Note: The read out speed of the evaluation software is much less than the TDC sample rate.
Therefore, in most cases BLOCKWISE_FIFO_READ will give more reasonable display. In addition,
often the difference between channels is of interest only and DELTA should be used for display. To
have this calculated correctly, Math should be enabled.
COMMOM_FIFO_READ helps if the same number of data from several channels is expected.
4.4 Avoiding Configuration Conflicts
Some combinations of parameter settings can prohibit operation or cause erroneous results. Some
of these combinations are indicated with a red bar. User should avoid such configurations since
the results may be difficult to interpret or faulty at all.
Some examples of configuration conflicts:
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