EENG 393

Lab 7 - uSupply Footprints

Lab:	7
Status	Live

InLab 7

Some self-guided activities.

Lab 7 assignment

Add the following parts to your library and replace the equivlent part in your schematic with these parts.

Part	Foot	DigiKey part number	Source
LT3080	TO-220-5R or SOT-223	505-LT3080IT#PBF-ND	Built from inLab instructions
LP2983	SOT23-5	LP2983AIM5-1.0/NOPBCT-ND	Downlod the footprint from SnapEDA
LP2985	SOT23-5	296-24263-1-ND	Downlod the footprint from SnapEDA
Terminal Block	Custom	277-6722-ND	Build from inLab instructions or find it on SNAP-EDA

While you are at it, please add the following parts to your schematic.

Search	Library	Folder	Name	Description
Search	Library	Folder	Name	Description	Value
test	testpad	TP	TPPAD-13(TP)	P1-13	various names
jump	jumper		JP1E	JUMPER	GND, VOUT
c1206	rlc	C-US	C-US1206	C1206	10n, 2.2u
DPDT	SparkFun-Switches	SWITCH-DPDT	SWITCH_DPDT_SMD_AYZ0202	SWITCH_DPDT_SMD_AYZ0202

Lab 6 schematic

After finishing lab 6, your schematic should similar to the following. After creating the footprints in the table above, you should replace the circuit elements circled in red. Also make sure to place the pair of linear regulators (the LP2985 and LP2983) and their associated bypass capcitors. Note that these capacitors are 1206 form factor, not Panasonic_B used previously.

Lab 7 schematic

After replacing the components above and adding the additional parts called for, your schematic should look like the image below. You will need this completed schematic as the starting point for your lab next week.

You will notice that the signals into the pair of DPDT switches are not properly designated. The last thing that you need to your schematic is to figure out how to get the VU meter to operate in ont of the following modes:

Display V_SET
Display I_SET
Display V_OUT
Display I_OUT

To accomplish this, you will need to set both the inputs to the top of VU meter to their correct values. This means that the input to the VU meter's voltage divider circuit should be either 1V or 10V. The input to the non-inverting inputs of the VU meter op-amps should be the one of the four display signals listed above. The DPDT switches will allow you to switch pairs of signals to accomplish this.

Complete the circuit in your schematic by placing the existing net names on A-J.

Turn-in

This is an individual assignment.

Print the footprints for the LT3080, ON/OFF switch and the terminal block as PDF files using a scale factor of 5. Print the revised schematic of your uSupply as a PDF so that it fits on one page (scale factor about 0.9 should work) with the new parts and those asked for in the assignment.

Combine these PDFs into one file - you can use the combine your PDF files using https://combinepdf.com/ (Links to an external site.)in the following order:

Page 1 - Revised schematic
Page 2 - LT3080
Page 3 - ON/OFF Switch