Amplifiers forum

Hi John,

I see from your screenshot that the fault is a USB connection issue. I'm not sure if this is due to the software/drivers or if this is a hardware connection issue on your EVM. Can you provide an image of your PGA308EVM setup including all of the jumper configurations and the configurations on the USB-DAQ board?

Are you running the software on Windows 10? The advice in the link Renan provided suggests reinstalling the software as administrator to ensure the software has the correct privileges. Were you able to do this?

Thanks,

Zach 

Hi John,

1.) As you are unable to provide an image of your jumper configuration, can you confirm the exact datasheet image you are following to set up your jumper configuration? For example: PGAEVM User's Guide (SBOU060A) figure 3-5.

2.) From my understanding you are running the PGA308.exe software on Windows 10 and are receiving the error. When you run the PGA309EVM software on the same windows 10 computer you are successful.

Are you using the same USB-DAQ controller for both PGA308EVM and PGA309EVM? Or are you using two different USB-DAQ controllers, one for each EVM?

If you select the "Run without USB" option on the PGA308EVM are you able to preview the GUI?

Thanks,

Zach

Hi John,

Thanks for providing the image of your board configuration.

When you connect this USB-DAQ board to the 6-9V power supply, are you able to see the 3 LEDs in the bottom left of the board light up? These LEDs are labelled "μC OK", "3.3V", and "Vcc".

I understand you are using two separate USB-DAQ controllers, one for each EVM. As you have successfully connected using the PGA309EVM and its accompanying USB-DAQ controller I will refer to this USB-DAQ as "known good". The USB-DAQ you currently have connected to your PGA308EVM will be referred to as "in question".

You can attempt an A-B-A swap by connecting the known-good USB-DAQ controller to the PGA308EVM board and the USB-DAQ in question to the PGA309EVM.

As you are connecting the EVMs, ensure that the power supply cable is connected and powered on before the USB cable is connected. You may also do an A-B-A swap with the USB cable to ensure the cable is good as well.

Thanks,

Zach

all the Leds  uc/ok, 3.3v Vcc, vdut  are all lit..Switching USB daq boards makes no difference   the issue follows the 308 board as well as running the 308.exe program. 

I have followed the connection scheme of power,  then usb then load the program. I have swapped out the cables both with a new cable and between the 2 evms on the same computer as well as to both computers. 

John Garcia 

Hi John,

I understand both USB-DAQ boards are working correctly and the issue is only present when connecting with the PGA308EVM.

When you run the PGA308.exe program, does the "Vdut" LED light up?

In my testing, the PGA308EVM software will run and light up the Vdut LED as long as the USB is connected to the USB-DAQ, even if the PGA308EVM is not connected to the USB-DAQ.

Are you able to select "Set Address and Try Again"? If so, please ensure that the USB address aligns with your jumper configuration (JUMP4 and JUMP5).

Regards,

Zach

 i get   a time out  and an error insufficient memory.

Hi John,

When you run the PGA308.exe program, does the "Vdut" LED light up?

Regards,

Zach

yes, it comes on.

my primary use case , is to be able to read and debug sensors  that are complete using the 1 wire interface. how to do this is not well detailed in any of the documents.

jg

Hi John,

The VDUT light should only come on if the software is communicating. I see in the previous comments that you noticed this behavior after installing a new USB driver.

Was the PGA308EVM software operating correctly before the new USB driver was installed?

Are you able to try on another computer that did not install this USB driver?

You can also try probing the 1W pin on the PGA308EVM while stating the software to determine if the one-wire is attempting to communicate with the device. Note the PGA308 has a finite number of OTP banks, so if the all OTP was already written sometimes the EVM can appear dead. If necessary we should be able to sample another PGA308EVM to be sure the issue is not hardware related.

The one-wire protocol, timing diagrams, register configurations, and operating modes are detailed exhaustively in the PGA308 User's Guide: https://www.ti.com/lit/ug/sbou069b/sbou069b.pdf 

Regards,

Zach

I reviewed all the documents on the pga 308 test board including your link. to documents 

There are no recommendations nor notations of the jumper setting nor the Terminal connections to connect an external fully packaged production sensor  for the one wire communications . 

All references pictures have only the 3 or 4 wire connections shown in a generic form with no indications of terminals on the pga308 test board nor what if any jmprs have to be configured to get the 1 wire interface as well as the power and ground to a set of terminals . on the pga 308 test board there are jumprs jmp7 and jumper jmp1 , jmpr 6 ,3 , 11 that all could influence the connections but there is no reference to these in the 308 documents. nor in the 1 wire sections.

what are the jumper settings for an external device as well as what terminal blocks or ports are connected to the external packaged sensor to acess the 1 wie interface?

jg

i am a bit confused: my sensor contains a bridge with temperature compensation , and a pga 308 circuit card. it has a vcc in,  a gnd pin and a sensor vout pin

 based on the jumpers , which wire from my packaged device goes where? since t5 is connected directly into the 308 input  based on 17 and 18 , and 9 and 10

where  do i get vcc from for my full sensor and  do i put the output to which pin on t5 , and the other gnd to what location?

jg

Hi John,

my sensor contains a bridge with temperature compensation , and a pga 308 circuit card. it has a vcc in,  a gnd pin and a sensor vout pin

It sounds like your sensor already has a PGA308 device onboard. You would need to connect a VCC supply and GND potential to power on the device. As your sensor only provides the Vout pin, I would assume the PGA308 is configured in 3-wire mode.

Maybe it will help clear things up if you can provide a block diagram showing your system and what you are trying to accomplish with your sensor and the PGA308EVM?

Can you also provide a schematic of your sensor and PGA308 circuit card?

Thanks,

Zach

the packaged sensor is a custom produced device for Ihydrant.  We have been seeing devices come back from the field that behave abnormally.

the behavior appears to be consistent with various failure modes or possibly memory/programming issues in the pga308 in the device.

Since the sensors are produced by a 3rd party for us, we are trying to narrow down the type of failure without deconstruction of the device which would void any return and replacement of the packaged sensor.  I am looking for cracked or damaged Bridge devices, damaged temperature compensation resistors in the bridge, Evidence of the 308 memories being scrambled by possible abnormal pulse feedback on the output/program line.

Looking to see if either over-range or under-range default voltages are being activated inside the 308 in the total sensor. 

Looking to understand if the 308 device is damaged and has no communication since some devices have output voltages that track the vcc , and others are stuck at either vcc or 0 pressure output voltage (.1 volt) regardless of what pressure is applied to the pressure port of the device.

The device is configured  just like your schematic    with the temperature compensation resistor, and an internal regulator set at 2.7volts. the lower limit is 0.1volt dc for atmospheric, and 2.1 volts for 500 psi (4mv per psi)

none of this is document nor provisioned on the evm .

Based on that  we have a +3volt in wire a sensor out wire and a gnd wire ,

 would it not make sense that,  jmpr 13  to nc

jmpr 10 nc , jmpr 1 to nc,  jmpr 7  vout to one , jmpr 5 remove

remove r20 on the 308test board  also  there needs to be a disconnect somehow to the line to VFb on the 308chip on the test board.(cut lead?)

My sensor then should connect to t4 vout to sensor out, gnd to gnd  , and a jumper clip from test point vs to my sensor vcc.

jg