Internal connections - Revision history

Markus Friedrich at 13:11, 11 September 2017

2017-09-11T13:11:28Z

← Older revision		Revision as of 15:11, 11 September 2017
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	[[Image:Belastbar.jpg]]<br><br>		[[Image:Belastbar.jpg]]<br><br>

	Both connections are needed to give reasonable mechanical stability. If the current load is low both connections can have separate pads. So the internal connection might be used like a bridge. Route close to one of the pads and continue routing with the other. The gap in between can be used routing through to it. But if the current load is high it might be necessary to connect both pins by a current leading piece of track.		Both connections are needed to give reasonable mechanical stability. If the current load is low both connections can have separate pads. So the internal connection might be used like a bridge. Route close to one of the pads and continue routing with the other. The gap in between can be used routing through to it. But if the current load is high it might be necessary to connect both pins by a current leading piece of track. Electrically it can be sufficient to connect only one pad.

	For the fact that the decision for the load capacity in most cases is not made by the designer of the part, the user of this part needs to confirm the connection. In the layout just draw two normal pads not touching each other. In the schematic create two pins as well but place them exactly superposed to each other:<br>		For the fact that the decision for the load capacity in most cases is not made by the designer of the part, the user of this part needs to confirm the connection. In the layout just draw two normal pads not touching each other. In the schematic create two pins as well but place them exactly superposed to each other:<br>
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	[[Image: PinsUebereinander2_e.jpg]]		[[Image: PinsUebereinander2_e.jpg]]

	If more than 2 pins represent one pole in a connector then the pins are combined as three: 1+2+3, 4+5+6, ... Such a combination in TARGET is called "cluster".		If more than 2 pins represent one pole in a connector then the pins are combined as three: 1+2+3, 4+5+6, ... Such a combination in TARGET is called "cluster".

	In a package being already placed to the layout please click [[M11]] upon its handle cross. Use button [Internal connection] while the dialog "Change packages" flashes. Now the pins belonging to each other can be combined to clusters. If the pins in the schematic already are superposed to each other correctly then just confirm the proposal. In consequence TARGET combines all clusters automatically.		In a package being already placed to the layout please click [[M11]] upon its handle cross. Use button [Internal connection] while the dialog "Change packages" flashes. Now the pins belonging to each other can be combined to clusters. If the pins in the schematic already are superposed to each other correctly then just confirm the proposal. In consequence TARGET combines all clusters automatically.
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	[[Image: Cluster.jpg]]		[[Image: Cluster.jpg]]


			Important note: All pads need to be connected in this case.<br><br>

	Other CAD systems (e.g. [[Eagle_commands_and_how_to_do_it_in_TARGET_3001#CONNECT\|Eagle]]) require the decision whether pins are internally connected already when drawing the part. The properties "all" and "any" are used in a "Connect" context. "all" for: all pins need to be connected, "any" for: it is sufficient to connect any pin. This may lead to problems later because the designer of the part can not know, how heavy the electrical load later will be. A push button with one pin and a 2x2 connection in a motor control sure won't lead the complete motor current through its small package just only because 2 pins are joint together to GND:		Other CAD systems (e.g. [[Eagle_commands_and_how_to_do_it_in_TARGET_3001#CONNECT\|Eagle]]) require the decision whether pins are internally connected already when drawing the part. The properties "all" and "any" are used in a "Connect" context. "all" for: all pins need to be connected, "any" for: it is sufficient to connect any pin. This may lead to problems later because the designer of the part can not know, how heavy the electrical load later will be. A push button with one pin and a 2x2 connection in a motor control sure won't lead the complete motor current through its small package just only because 2 pins are joint together to GND:

Markus Friedrich at 13:01, 11 September 2017

2017-09-11T13:01:18Z

← Older revision		Revision as of 15:01, 11 September 2017
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	[[Image:Taster5Pol.jpg]] [[Image:Elektromotor.jpg]]		[[Image:Taster5Pol.jpg]] [[Image:Elektromotor.jpg]]



	== Drawing a part with internal connections ==		== Drawing a part with internal connections ==

Markus Friedrich: /* One signal, one pin but two pads */

2017-09-11T12:58:52Z

One signal, one pin but two pads

← Older revision		Revision as of 14:58, 11 September 2017
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	In a component several pins/pads might internally be connected in order to have electrical load capacity. They might be used like a brigde. For example in a connector one terminal can be connected to ~~several~~ pads:		In a component several pins/pads might internally be connected in order to have electrical load capacity. They might be used like a brigde. For example in a connector one terminal can be connected to two or even more pads:

	[[Image:Flachstecker.jpg]]<br><br>		[[Image:Flachstecker.jpg]]<br><br>
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	[[Image:Taster5Pol.jpg]] [[Image:Elektromotor.jpg]]		[[Image:Taster5Pol.jpg]] [[Image:Elektromotor.jpg]]



	== Drawing a part with internal connections ==		== Drawing a part with internal connections ==

Markus Friedrich at 12:56, 11 September 2017

2017-09-11T12:56:58Z

@@ Line 1: / Line 1: @@
-== Drawing a part with internal connections ==
+== One signal, one pin but two pads ==
@@ Line 52: / Line 33: @@
 [[Image:Taster5Pol.jpg]] [[Image:Elektromotor.jpg]]
 [[fr: Connexions internes]] [[de:Interne Verbindungen]]

Markus Friedrich: /* One signal, one Pin but two pads */

2017-09-11T12:54:35Z

One signal, one Pin but two pads

← Older revision		Revision as of 14:54, 11 September 2017
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	[[Image:Belastbar.jpg]]<br><br>		[[Image:Belastbar.jpg]]<br><br>

	Both connections are needed to give mechanical stability. If the current load is low both connections can have separate pads. So the internal connection might be used like a bridge. Route close to one of the pads and continue routing with the other. The gap in between can be used routing through to it. But if the current load is high it might be necessary to connect both pins by a current leading piece of track.		Both connections are needed to give reasonable mechanical stability. If the current load is low both connections can have separate pads. So the internal connection might be used like a bridge. Route close to one of the pads and continue routing with the other. The gap in between can be used routing through to it. But if the current load is high it might be necessary to connect both pins by a current leading piece of track.

	For the fact that the decision for the load capacity in most cases is not made by the designer of the part, the user of this part needs to confirm the connection. In the layout just draw two normal pads not touching each other. In the schematic create two pins as well but place them exactly superposed to each other:<br>		For the fact that the decision for the load capacity in most cases is not made by the designer of the part, the user of this part needs to confirm the connection. In the layout just draw two normal pads not touching each other. In the schematic create two pins as well but place them exactly superposed to each other:<br>

	[[Image: PinsUebereinander_e.jpg]]<br>		[[Image: PinsUebereinander_e.jpg]]<br>

Markus Friedrich: /* One signal two pads */

2017-09-11T12:52:11Z

One signal two pads

← Older revision		Revision as of 14:52, 11 September 2017
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	== One signal two pads ==		== One signal, one Pin but two pads ==


	In a component several pins/pads might internally be connected in order to have electrical load capacity. ~~So they can~~ be used like a brigde. For example in a connector one terminal can be connected to several pads:		In a component several pins/pads might internally be connected in order to have electrical load capacity. They might be used like a brigde. For example in a connector one terminal can be connected to several pads:

	[[Image:Flachstecker.jpg]]<br><br>		[[Image:Flachstecker.jpg]]<br><br>

Markus Friedrich at 10:53, 15 July 2015

2015-07-15T10:53:32Z

← Older revision		Revision as of 12:53, 15 July 2015
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	== Drawing a part ~~having~~ internal connections ==		== Drawing a part with internal connections ==

Markus Friedrich at 14:25, 14 July 2015

2015-07-14T14:25:02Z

← Older revision		Revision as of 16:25, 14 July 2015
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	\|}		\|}

	'''Linking (concatenating) of pins in ~~the~~ TARGET 3001! schematic symbol is reached by superposing them.'''<br> So draw in TARGET a symbol with eight pins and and move pins two and three over pin number one. Do the same with pins number six seven and eight, superpose them over pin five. That's the way it looks at the end:<br><br>		'''Linking (concatenating) of pins in a TARGET 3001! schematic symbol is reached by superposing them.'''<br> So draw in TARGET 3001! a symbol with eight pins and and move pins '''two and three over pin number one'''. Do the same with pins number '''six seven and eight, superpose them over pin five'''. That's the way it looks at the end:<br><br>

	[[Image: csd17308q3_symbol1.jpg\|Symbol of the power mosfet\|none]]Image: Symbol of the power mosfet with internal connections drawn in TARGET 3001!<br><br>		[[Image: csd17308q3_symbol1.jpg\|Symbol of the power mosfet\|none]]Image: Symbol of the power mosfet with internal connections drawn in TARGET 3001!<br><br>

Markus Friedrich at 14:22, 14 July 2015

2015-07-14T14:22:47Z

← Older revision		Revision as of 16:22, 14 July 2015
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	\|}		\|}

	'''Linking (concatenating) of pins in the TARGET 3001! schematic symbol is reached by superposing them.''' So draw in TARGET a symbol with eight pins and and move pins two and three over pin number one. Do the same with pins number six seven and eight, superpose them over pin five. That's the way it looks at the end:<br><br>		'''Linking (concatenating) of pins in the TARGET 3001! schematic symbol is reached by superposing them.'''<br> So draw in TARGET a symbol with eight pins and and move pins two and three over pin number one. Do the same with pins number six seven and eight, superpose them over pin five. That's the way it looks at the end:<br><br>

	[[Image: csd17308q3_symbol1.jpg\|Symbol of the power mosfet\|none]]Image: Symbol of the power mosfet with internal connections drawn in TARGET 3001!<br><br>		[[Image: csd17308q3_symbol1.jpg\|Symbol of the power mosfet\|none]]Image: Symbol of the power mosfet with internal connections drawn in TARGET 3001!<br><br>

Markus Friedrich at 14:22, 14 July 2015

2015-07-14T14:22:31Z

← Older revision		Revision as of 16:22, 14 July 2015
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	We look for example at a power mosfet '''CSD 1730 8Q3''' from Texas Instruments that "has been designed to minimize losses in power conversion applications and optimized for 5V gate drive applications" [http://www.ti.com/lit/ds/symlink/csd17308q3.pdf Data sheet]<br><br>		We look for example at a power mosfet '''CSD 1730 8Q3''' from Texas Instruments that "has been designed to minimize losses in power conversion applications and optimized for 5V gate drive applications" [http://www.ti.com/lit/ds/symlink/csd17308q3.pdf Data sheet]<br><br>

	The symbol shows the source connections 1, 2 and 3 (left hand side) are linked together as well as the drain connections 5, 6, 7 and 8. Only the gate terminal 4 is separate. The task is to '''make three from eight!''', because the landpattern has eight contacts and needs to come to terms with only three signals without grouching about ~~wrong~~ connections.<br><br>		The symbol shows the source connections 1, 2 and 3 (left hand side) are linked together as well as the drain connections 5, 6, 7 and 8. Only the gate terminal 4 is separate. The task is to '''make three from eight!''' because the landpattern has eight contacts and needs to come to terms with only three signals without grouching about missing connections.<br><br>
	{\|		{\|
	\|- width="80%"		\|- width="80%"
	\|[[Image: csd17308q3_symbol.jpg\|Symbol of a power mosfet\|none]]Image: scheme of the mentioned power mosfet with internal connections. <small>Source: TI data sheet.</small><br><br>\|\|[[Image: Csd17308q3_gehaeuse.jpg\|Landpattern of the power mosfet\|none]]Image: package of the mosfet with internal connections, bottom view. <small>Source: TI data sheet.</small><br><br>		\|[[Image: csd17308q3_symbol.jpg\|Symbol of a power mosfet\|none]]Image: scheme of the mentioned power mosfet<br>with internal connections. <small>Source: TI data sheet.</small><br><br>\|\|[[Image: Csd17308q3_gehaeuse.jpg\|Landpattern of the power mosfet\|none]]Image: package of the mosfet with internal connections,<br>bottom view. <small>Source: TI data sheet.</small><br><br>
	\|}		\|}

	'''~~The linking~~ of pins in the TARGET 3001! schematic symbol is reached by superposing them.''' So draw in TARGET a symbol with eight pins and and move pins two and three over pin number one. Do the same with pins number six seven and eight: superpose them over pin five. That's the way it looks at the end:<br><br>		'''Linking (concatenating) of pins in the TARGET 3001! schematic symbol is reached by superposing them.''' So draw in TARGET a symbol with eight pins and and move pins two and three over pin number one. Do the same with pins number six seven and eight, superpose them over pin five. That's the way it looks at the end:<br><br>

	[[Image: csd17308q3_symbol1.jpg\|Symbol of the power mosfet\|none]]Image: Symbol of the power mosfet with internal connections drawn in TARGET 3001!<br><br>		[[Image: csd17308q3_symbol1.jpg\|Symbol of the power mosfet\|none]]Image: Symbol of the power mosfet with internal connections drawn in TARGET 3001!<br><br>