Texas Instruments TDC1000-GASEVM User manual

TDC1000-GASEVM User’s Guide
User's Guide
Literature Number: SNIU026A
March 2015–Revised December 2015

Contents
1 General Overview................................................................................................................. 5
2 TDC1000-GASEVM vs. TDC1000-TDC72000EVM ...................................................................... 5
3 EVM Package Contents......................................................................................................... 5
4 Software ............................................................................................................................. 5
5 Setup.................................................................................................................................. 6
6 Software Installation............................................................................................................. 8
6.1 Graphical User Interface (GUI)......................................................................................... 8
7 TDC1000-BSTEVM Setup and Operation ................................................................................. 9
7.1 Connections............................................................................................................... 9
8 Launching the Software ...................................................................................................... 10
9 Clock Selection.................................................................................................................. 14
9.1 Steps to Select the CPU Clock ...................................................................................... 14
10 Possible Excitation Pulses ................................................................................................. 17
11 Troubleshooting................................................................................................................. 18
11.1 Boost converter ......................................................................................................... 18
11.2 Jumper ................................................................................................................... 18
11.3 Firmware Upgrade...................................................................................................... 19
12 TDC1000-GASEVM Board Layout ......................................................................................... 21
13 TDC1000-GASEVM Schematic.............................................................................................. 29
14 TDC1000-BSTEVM Board Layout.......................................................................................... 32
15 BSTEVM Schematic............................................................................................................ 33
Revision History.......................................................................................................................... 34
2Table of Contents SNIU026A–March 2015–Revised December 2015
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List of Figures
1 TDC1000-GASEVM ......................................................................................................... 6
2 TDC1000-BSTEVM Board.................................................................................................. 7
3 TDC1000-7200EVM Installation Directory................................................................................ 8
4 TDC1000-BSTEVM Plugged into TDC1000-TDC7200EVM ........................................................... 9
5 SETUP Tab in TDC1000-TDC7200EVM................................................................................ 11
6 Top to Bottom: START Pulse, Voltage on VDD Pin of UCC Driver, Voltage Across Connector J1, EN1
Signal on Oscilloscope .................................................................................................... 12
7 Top to Bottom: TDC1000's START Pulse (Dark Blue), TDC1000's Tx Signal (Light Blue), and the
Boosted 30 V of TD1000's Tx Signal (Green).......................................................................... 13
8 Place Jumper on JP6 to Use the CPU Clock........................................................................... 14
9 Select CPU-CLK............................................................................................................ 15
10 Clock Options............................................................................................................... 16
11 Excitation Pulses Chart.................................................................................................... 17
12 Jumper....................................................................................................................... 18
13 Connection Error Pop-up Window ....................................................................................... 19
14 USB Firmware Upgrade Window......................................................................................... 20
15 Top Overlay................................................................................................................. 21
16 Top Solder Mask ........................................................................................................... 22
17 Top Layer.................................................................................................................... 23
18 Mid Layer 1.................................................................................................................. 24
19 Mid Layer 2.................................................................................................................. 25
20 Bottom Layer................................................................................................................ 26
21 Bottom Solder Mask ....................................................................................................... 27
22 Board Dimensions.......................................................................................................... 28
23 TDC1000-GASEVM Schematic 1........................................................................................ 29
24 TDC1000-GASEVM Schematic 2........................................................................................ 30
25 TDC1000-GASEVM Schematic 3........................................................................................ 31
26 BSTEVM Layout............................................................................................................ 32
27 TDC1000-BSTEVM ........................................................................................................ 33
3
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List of Tables
1 Jumper....................................................................................................................... 18
4List of Tables SNIU026A–March 2015–Revised December 2015
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User's Guide
SNIU026A–March 2015–Revised December 2015
TDC1000-GASEVM and TDC1000-BSTEVM Kit User’s
Guide
1 General Overview
This user's guide details the use of the TDC10000-GASEVM, which is comprised of two boards. The first
board is the main TDC1000-GASEVM, which includes an on-board TDC1000 (ultrasonic analog-front-
end), TDC7200 (time-to-digital converter), and MSP430 microcontroller. The purpose of this board is to
excite the transducers, receive the returned echo, generate the STOP pulses, and digitize the time-of-flight
to the MSP430 for further processing. This main board connects with a separate TDC1000-BSTEVM
board (referred to as HV board for the remainder of this document). The purpose of the HV board is to
boost the transmit pulses from 3.7V-to-30V to get a better received echo for applications where a higher
range is necessary or when the ultrasonic medium is a gas or is exposed to vibration.
2 TDC1000-GASEVM vs. TDC1000-TDC72000EVM
The TDC1000-GASEVM is compatible with the Firmware and GUI of the TDC1000-TDC72000EVM since
all the components are the same. However, the TDC1000-GASEVM has the following component
changes to facilitate rapid evaluation for water/gas flow applications.
1. The TDC1000-GASEVM has been designed for Gas Flow applications. The passive components that
determine the first order filter of the Rx signal path have been tuned for frequencies between 58 kHz to
300 KHz.
2. The resistors connecting the TX2/RX1 and TX1/RX2 channel have been removed to enable the
TDC1000-GASEVM to be used with the TDC1000-BSTEVM. When resistors have been removed, the
transmitting pulses increase from 3.7 V to 30 V.
3 EVM Package Contents
The TDC1000-GASEVM evaluation kit contains the following:
• On board TDC1000 (ultrasonic analog-front-end) and TDC7200 (time-to-digital converter)
• On board MPS430 microcontroller
• USB Mini-B to USB-A plug cable
The TDC1000-BSTEVM kit contains the following:
• On board LM2733XMF boost converter
• On board UCC27531 Gate drivers
• Connectors to plug into the TDC1000-GASEVM or TDC1000-TDC7200EVM
4 Software
The firmware and GUI is the same as the TDC1000-TDC7200 EVM. For detail information about the GUI
and troubleshooting the software, see the TDC100-TDC7200EVM User's Guide SNIU021.
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Setup www.ti.com
5 Setup
1. Download TDC1000-TDC7200 Software (same software for TDC1000_GASEVM)
2. Install the GUI. For detailed information, see Section 6.
3. Connect TDC1000-BSTEVM to TDC1000-GASEVM
4. Connect a gas pipe transducers to the TDC1000-BSTEVM
5. Connect the EVM board to the computer with a USB cable (J2).
6. Launch the GUI. See Section 8
7. On the GUI's “SETUP” tab, select the "TDC1000-HV Boost Power Enable", “TDC1000-HV Driver EN1”
and/or “TDC1000-HV Driver EN2” depending on which TX port your transducer is connected to.
8. On the “GRAPH” tab, press the “START GRAPH” button.
9. Select an "EN period (us)" in that matches your excitation duration in μs. For instance if you are using
a 200Khz transducer with 10 excitation pulses the duration = (# pulses/Xmit freq)*1e6+30us or 80 us.
10. Run the GUI as explained in SNIA020
Figure 1. TDC1000-GASEVM
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Figure 2. TDC1000-BSTEVM Board
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Software Installation www.ti.com
6 Software Installation
6.1 Graphical User Interface (GUI)
Installing the TDC1000-GASEVM GUI software:
1. Download the GUI http://www.ti.com/product/TDC1000/toolssoftware
2. Unzip the downloaded file into a known directory and run it
3. Follow the pop-up screen instructions. Click “Next” to install the software.
Figure 3. TDC1000-7200EVM Installation Directory
4. When the installation is done, click “Finish”.
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www.ti.com TDC1000-BSTEVM Setup and Operation
7 TDC1000-BSTEVM Setup and Operation
7.1 Connections
1. Connect the USB cable (J2) from the TDC1000-GASEVM to the PC.
2. Plug the TDC1000-BSTEVM (HV board) into the TDC1000-GASEVM (see Figure 4).
3. Attach the transducer wires to the connectors J1 and J2 on the HV board.
On the TDC1000-GASEVM, make sure the following jumpers are in place.
1. JP1: TDC7200 - connect pin 1 to pin 2 (via a jumper)
2. JP2: CPU - connect pin 1 to pin 2 (via a jumper)
3. JP3: TDC1000 - connect pin 1 to pin 2
4. JP4: VIO - connect pin 1 to pin 2
5. JP5: Trigger - connect pin 2 to pin 3
6. JP6: CLOCK - connect pin 5 to pin 6
Figure 4. TDC1000-BSTEVM Plugged into TDC1000-TDC7200EVM
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Launching the Software www.ti.com
8 Launching the Software
1. The TDC1000_TDC7200EVM GUI software can be run by clicking on Start >> All Programs >>
Texas Instruments >> TDC1000_7200.
2. See TDC100-TDC7200EVM_Users_Manual (SNIA020) on how to use the GUI
3. When using the HV board: Go to the “SETUP” tab on the TDC1000-7200EVM GUI and select
"TDC1000-HV Boost Power Enable" to enable the 30V boost supply. The supply will remain on
constantly (Always ON) unless a different time period is selected via the pulldown box. The capacity to
reduce the Boost power supply active time is to enable very low power applications testing so the
BOOST supply is only active during the measurement cycle time. Next make sure to select either
“TDC1000-HV Driver EN1” or “TDC1000-HV Driver EN2” -- or both of them by checking the respective
box.
(a) Select an "EN period (us)" in µs. This is the time the EN will stay HIGH after the START pulse of
the EVM. EN will go high about 30 µs before START to ensure that the driver ICs on the HV
interface board are powered up in time for the first Tx pulses. Example: If you choose an EN period
of 40 µs (default = 30 µs), you will see a EN pulse with the length of 70 µs, because it consists of
the constant 30 µs before the START signal plus whatever you choose for EN period.
(b) A longer EN period can be used to dampen the oscillation of the ultrasonic transducers. After the
last Tx pulse, the output of the driver IC will be pulled to ground via the 110-Ωresistor that is on the
board until the voltage on the VDD pin drops below about 3 V.
4. You can set the “EN period” for EN1 and EN2 separately, but whichever is higher will be applied to
BOTH enables if EN1 and EN2 are checked.
5. If you choose to use one channel with 5V pulses and the other with 30V, you can bypass the HV driver
of Channel 2. Make sure to uncheck the box "TDC1000-HV Driver EN2" in the GUI and to also place
the jumper JP1 on the HV board to "LV" for low voltage.
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www.ti.com Launching the Software
Figure 5. SETUP Tab in TDC1000-TDC7200EVM
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Figure 6. Top to Bottom:
START Pulse,
Voltage on VDD Pin of UCC Driver,
Voltage Across Connector J1,
EN1 Signal on Oscilloscope
6. Observe the following signals: TDC1000's START (dark blue) on the TDC1000-GASEVM, VDD of
driver IC U2(light blue) on the HV board, transmit pulses on transducer connector J1 (green) and EN1
(pink) signals on the oscilloscope as shown in Figure 6. This shows that the VDD of the driver is turned
on in time and long enough for this number of pulses. If the last pulses are reduced in amplitude,
increase EN period in the “SETUP” tab of the GUI.
7. EN signal should go high about 30µs before START goes high.
8. Observe Tx pulses and voltage at the output of the high voltage drivers as shown in Figure 7. Tx and
transducer voltage at connectors J1/2 should be in phase. Tx should have an amplitude of 3.7Vpk-pk
and transducer voltage 30Vpk-pk.
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www.ti.com Launching the Software
Figure 7. Top to Bottom:
TDC1000's START Pulse (Dark Blue),
TDC1000's Tx Signal (Light Blue),
and the Boosted 30 V of TD1000's Tx Signal (Green)
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Clock Selection www.ti.com
9 Clock Selection
In order to excite the transducer with its resonant frequency and to achieve the maximum energy transfer
and therefore generate a big echo, the EVM allows you to apply the external clock, use the onboard
oscillator, or to use the CPU clock.
For gas flow applications, we recommend using the CPU clock. The steps to select the CPU clock can be
seen in the following subsections.
9.1 Steps to Select the CPU Clock
1. On the TDC1000-GASEVM, place the JP6 Jumper on the CPU position
Figure 8. Place Jumper on JP6 to Use the CPU Clock
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2. Select CPU_CLK on the SETUP tap of the GUI. A message will pop up. Click "OK".
Figure 9. Select CPU-CLK
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3. Check the CPU-CLK EN box and Select desired frequency from the drop down menu.
Figure 10. Clock Options
4. In the GUI and on the TDC1000 tab, select a clock divider from the TX_FREQ_DIV register. Note the
transducer's resonant frequency = (external clock) / (TX_FREQ_DIV). For example, if the transducer's
resonant frequency is 500kHz, and a CPU clock of 2MHz is chosen, then the TX_FREQ_DIV needs to
be 4. Figure 11 shows possible excitation pulses using the CPU clock or on-board oscillator of 8MHz.
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TX-Frequency
Division
2 4 8 16 32 64 128 256
On Board
Oscilator
8,000,000 4,000,000 2,000,000 1,000,000 500,000 250,000 125,000 62,500 31,250
1,000,000 500,000 250,000 125,000 62,500 31,250 15,625 7,813 3,906
1,043,500 521,750 260,875 130,438 65,219 32,609 16,305 8,152 4,076
1,090,900 545,450 272,725 136,363 68,181 34,091 17,045 8,523 4,261
1,142,900 571,450 285,725 142,863 71,431 35,716 17,858 8,929 4,464
1,200,000 600,000 300,000 150,000 75,000 37,500 18,750 9,375 4,688
1,263,200 631,600 315,800 157,900 78,950 39,475 19,738 9,869 4,934
1,333,300 666,650 333,325 166,663 83,331 41,666 20,833 10,416 5,208
1,411,800 705,900 352,950 176,475 88,238 44,119 22,059 11,030 5,515
1,500,000 750,000 375,000 187,500 93,750 46,875 23,438 11,719 5,859
1,600,000 800,000 400,000 200,000 100,000 50,000 25,000 12,500 6,250
1,714,300 857,150 428,575 214,288 107,144 53,572 26,786 13,393 6,696
1,846,200 923,100 461,550 230,775 115,388 57,694 28,847 14,423 7,212
2,000,000 1,000,000 500,000 250,000 125,000 62,500 31,250 15,625 7,813
CPU Clock (Hz)
www.ti.com Possible Excitation Pulses
10 Possible Excitation Pulses
Figure 11. Excitation Pulses Chart
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Troubleshooting www.ti.com
11 Troubleshooting
11.1 Boost converter
The DC/DC converter on the HV board is a LM2733X 1.6 MHz boost converter with integrated switch.
Test point TP2 should show a voltage of 30 V. If this is not the case, check if TP3 shows the required
input voltage of 5 V.
11.2 Jumper
Table 1. Jumper
JUMPERS DESCRIPTION
JP1 Tx2 voltage selector: bypass HV driver when placed in “LV” position
For default operation (use high voltage for both channels), place jumper on the following:
1. JP1.P2 and JP1.P3 – HV
Figure 12. Jumper
When placing the jumper in LV position (on pins 1 and 2), “TDC1000-HV Driver EN2” should be
unchecked in the GUI. Otherwise the UCC27531 will pull its output to ground.
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11.3 Firmware Upgrade
Note: This section is only necessary if the firmware needs to be changed. The TDC1000-TDC7200EVM
comes pre-loaded with firmware already. The HV board needs firmware TDC1000_7200_FW-v1.16-1MHz
or newer.
To change the firmware, complete the following steps:
1. Connect the TDC1000-TDC7200EVM to a PC.
2. Open the TDC1000-7200EVM GUI then go to the “DEBUG” tab. Press “OK” if a connection error
window pops up. Click on the Update Firmware button.
Figure 13. Connection Error Pop-up Window
3. The MSP430 USB Firmware Upgrade windows will pop up. Click “Next” to proceed on the first prompt.
Read and accept the license agreement and click “Next” to continue.
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Figure 14. USB Firmware Upgrade Window
1. Disconnect and reconnect the LaunchPad to PC while holding the BSL button down.
2. Select the Select Firmware button and browse to the firmware file.
3. Click on the Upgrade Firmware button to program the EVM. Close the application when done and
restart the TDC1000_7200EVM GUI.
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