MaPSA Test

MaPSA Probe Testing

The Macro Pixel Sub-Assembly (MaPSA) is the bump bonded assembly of the pixelated PS-p sensor and the MPA (Macro Pixel ASIC) readout chip. The PS modules contain a strip sensor on the top layer and a the pixelated strip sensor on the bottom layer. This will require sixteen MPA chips (each with a size of 12 mm x 26mm and containing 1918 bumps) to be connected to a single large area sensor piece.

Details about the MaPSA

2x8 MPA chips
1 PS-p sensor per assembly
Pixels are on a 1446x200 μm pitch
- 200 μm pitch is staggered (effective 283 μm pitch)
From the first wirebond pad of 1 MPA to the next MPA first wirebond pad is 12mm. Important
MPA chips have 118 wirebond pads on 100 micron pitch.
Each pad has a 100x70 micron region for probe testing.

Setting things up

Turn on the wall air
- Located in the back of the prober, the second handle.

Turn only the Output

Press the green button of the Tesla Prober
- This is to initialize the Prober
Inside the Prober, check if the Probe Card is on
- It has a red LED indicator
Turn on the FC7 by turning the switch towards the user

Setting up the GUI

Connect to the FC7
- Ethernet Connection named enp2s0

If the terminal is not on root:

  cd Documents/MaPSA/MaPSA_Testing/Ph2_ACF
  su //This requires a password, ask supervisor
  source setup.sh

Initialize the FC7 and Probe Card

fpgaconfig -c settings/MaPSAstation.xml -i uDTC_MPA_SEU_Dev_PM.bin
fpgaconfig -c settings/MaPSAstation.xml -l

Run the GUI

cd MPA2_Testing/MPA2_Test/
./start_minigui_mpa.sh

On the terminal its going to output:

IP=192.168.0.8
______________________________________________________
             Starting MPA2 Test System                 
                                                      

PING 192.168.0.8 (192.168.0.8) 56(84) bytes of data.
64 bytes from 192.168.0.8: icmp_seq=1 ttl=64 time=0.058 ms

--- 192.168.0.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.058/0.058/0.058/0.000 ms
=>  MPA Testbench correctly found at address 192.168.0.8
=>  Loading scripts
->  Board Selected MAC > 08:00:30:00:29:61 IP > 192.168.0.8
->  Loaded configuration for MPA

When the GUI launches it should look like this:

MaPSA

Step 1: Take the MaPSA

Take the MaPSA out of the dry box
Open the compartment of the prober

Turn around the MaPSA box and locate a flat corner in the box
This flat corner locates the First MPA of the MaPSA

Step 2: Placing the MaPSA

Using the vacuum pen take the MaPSA and place it between the white pins on the chuck
Close the compartment of the prober

Step 3: Setting up the Z-axis

On the prober's computer select Home icon
Lift the chuck by using the arrows in the Z setup

Lift the chuck up to 28000.0 or until you see faintly the MaPSA and make sure that the needles are in the pads

Step 4: Alignment

MaPSA Pads

MaPSA pads are divided in two sections:

Wirebond area ~100μm x 70μm
Probing area (closer to the sensor) ~200μm x 70μm

To align the prober:

Select the Manual Alignment button
Select two corners in the pads to align the MaPSA

Now that the prober is aligned with the pads of the MaPSA, position the crosshair on top of the previous probing marks on the pads.
- Sometimes is required to adjust the needles
- You can see where the needles are making contact by adjusting the focus of the microscope
- You can move side to side using the back dial from the microscope

Step 5: Make contact

Lower the needles using on the Z Setup
- Red box :No contact
- Yellow box :Before contact
- Green box : Contact

Step 6: Fill in the info

MaPSA GUI

On MaPSA ID:

HPK_XXXXX_XXX[X]

The final character being the letter of the side of the MaPSA (Left or Right)
On the MPA box fill in the number of the current MPA being tested.
- Note that each time the user finish testing one MPA and moves the needles to the next MPA, the user has to change this number manually, otherwise it WILL overwrite the data

Step 7: Run the initial tests

Click on Power On button

On the terminal you should see something like this

->  SSA enabled 
->  MPA enabled 
---> Enabling the MPA SSA Board I2C master
---> Enabling the MPA SSA Board I2C master
->     Sent Hard-Reset pulse 
->  P_dig:  74.130mW  [V=  0.983V - I= 75.450mA]
->  P_ana:  71.609mW  [V=  1.222V - I= 58.600mA]
->  P_pad:   9.840mW  [V=  1.230V - I=  8.000mA]
->  Total: 155.579mW  [             I=142.050mA]
... more stuff ...
Line Status: 
 Tuning done/applied: 1
 Line ID: 5,   Idelay: 5,   Bitslip: 6,   WA FSM State: 14,   PA FSM State: 14
Line Status: 
 Tuning done/applied: 1
 Line ID: 5,   Idelay: 5,   Bitslip: 6,   WA FSM State: 14,   PA FSM State: 14
->     Initialised SLVS pads and sampling edges
->     Sampling phases tuned
->     Activated normal readout mode

If the contact is not good, you will get an output with the Total Power and current numbers off by 10-20 mW or even 100mW!
- Additionally it can output an error
After this, click Pixel Alive
This will generate a plot with the status of the pixel and if it has noise or other problem with it (Operational)

Step 8: Run MPA test

The Pixel Alive should be 100 in the heat map
After this run the IV Scan
- This takes ~8 minutes

MaPSA GUI2

After it finishes, go to Plotting tab and click on Draw IV

This test runs up to -800V and as voltage goes up, the current goes up (Ohm’s Law)
An example of the first voltage and current taken and last

Voltage	Current
-10.00	-0.09
-800.00	-0.35

Step 9: Run MPA test

Go back to the Manual MPA test tab and click Test 1 MPA
- Check if the Power On is active
This will test:
- Wafer test
- Mask/Alive
- Pretrim S
- Prosttrim S
- Bad Bump
This test should take ~4.5 minutes (for each MPA)
After it finishes, click Plotting tab