02. Cadence uses records to create components - device schematic symbols and packages (OrCAD Capture CIS)
The reference tutorial is the video of station B: allegro software introductory video tutorial complete works 100 lectures
Pre-tutorial:
## 01. New project and basic operation of Cadence usage records (schematic drawing: OrCAD Capture CIS)
02. Cadence uses records to create components --- schematic diagrams and packages (OrCAD Capture CIS)
1 Create a schematic symbol for the device
Here as an example, use TPS450 as the schematic device to be drawn, and its basic Symbol can refer to the device manual TPS5450
:
Open the project created in the pre-tutorial, first select the Library folder, and then select the new library in File (if before If you have designed it, you can also choose to import the library directly):
the olb file will appear under the file column after the creation is completed, which is the library used in this project:
right click on the olb file, select to create a new Part:
Name is set to the name of the device to be designed, TPS450 .
Part Reference represents the initial letter of the device. For example, the device name inserted in AD is generally U1, U2 and the like
Parts per means that this device has several parts, and there is only one here. Students who have used AD may know that some devices can actually be divided into several parts such as PartA and PartB:
Package Type needs to be set when Parts per is greater than 1, and the differences are as follows:
Homogeneous: It means that the components of each part are the same, only one part needs to be drawn, and the other parts will be automatically generated.
Heterogeneous: It means that the components of each part are different, and each PART needs to be drawn by itself.
For details, you can read the difference between "Homogeneous and Heterogeneous" in cadence capture's component creation
Part Numbering indicates the numbering method of different parts, Alphabetic means that different parts are numbered with partA partB partC, and Numeric means that different parts are numbered with part1 part2 part3.
After clicking OK, a component will appear, but it has no pins:
select Pin from Place (or find the button to insert pins from the leftmost insertion toolbar):
For general pins, you can set Type to Passive. If you need to refine the specific function of the pin, you can set it to other values. The shape of the pin is also based on the specific type of the device. It is a common practice to set it as Line. Name and Numbe can be filled in now, or can be modified later:
insert all the pins in turn, and insert a rectangle around them to form a Symbol:
You can press Ctrl+S to save, and a warning may be reported when saving. This is because there are two pins that are called NC repeatedly. Just ignore it and click OK. Save it under the project directory.
2 Insert devices and basic components
Select Part in Place to call up the device column on the right:
you can easily find the TPS450 in the things you just created:
insert it into the schematic diagram:
where to find other commonly used devices, select here The ➕ button at the device library on the right:
Open the Discrete library in the default opening position, which contains various commonly used components, and other libraries can be used if necessary: You
can also use the search box to directly search for devices, for example, I want to insert a resistor You can search R directly, and you can find the result:
you can insert it into the schematic:
3 Create a Homogeneous device
For some components, the functions of multiple different Parts are the same, and here you can use the Homogeneous method to create them. Homogeneous only needs to draw one of the parts, and the other parts are automatically generated. Here is an example of drawing an LM358 operational amplifier, which includes two operational amplifiers. The schematic diagram is as follows: Create a
new component and set it up as follows:
Insert a triangle, pretending to be an operational amplifier:
Insert the pin of the first power amplifier:
Select Next Part in View switches to another part:
You can see that the shape of the other part is consistent with the previous design:
at this time, you only need to set the pin number:
save it by pressing Ctrl+S, and ignore the warning. After the schematic is inserted as follows:
4 Create a Heterogeneous device
Basically the same as above, but introduce too much!