mdcpickandplace:qfn
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mdcpickandplace:qfn [2010/10/19 16:16] ladyada created |
mdcpickandplace:qfn [2016/01/28 18:05] (current) |
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| This tutorial will show how to get QFN/TQFN/LGA/etc leadless parts placed | This tutorial will show how to get QFN/TQFN/LGA/etc leadless parts placed | ||
| - | ====== Lets go! ====== | + | ====== LGA-14: Lets go! ====== |
| We'll program the p&p to place an [[http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA745xL|MMA7455]] triple axis accelerometer in LGA-14. | We'll program the p&p to place an [[http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA745xL|MMA7455]] triple axis accelerometer in LGA-14. | ||
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| {{:mdcpickandplace:lgadim.gif|}} | {{:mdcpickandplace:lgadim.gif|}} | ||
| - | ===== Outer dimensions ===== | + | ==== Outer dimensions ==== |
| The first things we need to figure out are the **outside dimensions** including **thickness** | The first things we need to figure out are the **outside dimensions** including **thickness** | ||
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| Looking at the dimensional drawing, we see that it is **3mm** by **5mm** and **1mm** thick | Looking at the dimensional drawing, we see that it is **3mm** by **5mm** and **1mm** thick | ||
| - | ===== Pad size ===== | + | ==== Pad size ==== |
| Next we need to calculate the **pad dimension** this will help the vision system determine what to look for. Note that there is a tiny triangle next to one of the pins, we need to tell the vision to ignore small pads that are just indicators and just use the big pads | Next we need to calculate the **pad dimension** this will help the vision system determine what to look for. Note that there is a tiny triangle next to one of the pins, we need to tell the vision to ignore small pads that are just indicators and just use the big pads | ||
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| It looks like each rectangular pad is **0.5mm x 0.8mm** | It looks like each rectangular pad is **0.5mm x 0.8mm** | ||
| - | ===== Headline ===== | ||
| + | ==== Nozzle? ==== | ||
| + | |||
| + | We usually pick up the nozzles and see which is the biggest nozzle we can use. The bigger the nozzle, the less slipping we'll get while transporting the part around. We found nozzle #4 was the biggest we could go, maybe #5 would be OK | ||
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| + | ==== Part definition ==== | ||
| + | |||
| + | The **X** and **Y** are the width and height of the part (mm), **Thick** is the thickness (mm). We'll use bottom vision for small component (**LunaVis** = 26) | ||
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| + | The **Pt** and **W** entries are used for filtering. The **Pt** is the 'high end' of what sizes we'll look for and **W** is the 'low end' | ||
| + | So if each rectangular pad is 0.5mm x 0.8mm, we'll make **Pt** 1.0 mm (larger than 0.8mm) and **W** 0.25mm. This way we'll ignore the tiny triangle * | ||
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| + | ^ Part ^ Nozzle ^ dx0 ^ dy0 ^ st ^ da9 ^ X ^ Y ^ Pt ^ W ^ Thick ^ LunaVis ^ TS ^ Level ^ Type ^ Voff ^ Remark ^ | ||
| + | ^ 14-LGA | 5 | 0 | 0 | 0 | 0 | 3 | 5 | 1 | 0.25 | 1 | 26 | 60 | | CSP | | 14-LGA | | ||
| + | |||
| + | * (this is my guess actually, i dont completely understand the filtering funciton of Pt & W) | ||
/home/ladyada/public_html/wiki/data/attic/mdcpickandplace/qfn.1287505016.txt.gz · Last modified: 2016/01/28 18:05 (external edit)
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