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resistor details

Vtrai
Associate II

my question is in STM32F407VGT6 , LPQF100, resistor R26,R27, R28 is N/A and 0..what does it mean exactly i.e.,one resistor R26 N/A is connected to VDD and another resistor R27,R28 is connected to VSS(99pin)..and second question is does VSS has a supply from VDD?..and what is N/A and what is '0' and what is the is use of those resistors?.. please help me to sort out this issue...

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6 REPLIES 6

Sorry what BOARD or document are you looking at?

Some F4 and F7 parts within family have slightly different pin configuration so resistor fitted or not fitted​ may support broader range of parts, ie 407, 411, 427, 466 etc

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Ozone
Principal

> my question is in STM32F407VGT6 , LPQF100, resistor R26,R27, R28 is N/A and 0..

The STM32F407VGT6 has no R27 and R28.

I guess you mean the Discovery board.

The term "N/A" usually means "not applicable", i.e. the component is not placed on the PCB.

It wouldn't make much sense to connect a VSS pin of the MCU to VDD via a resistor, except for creating additional current consumption.

stm32f4discovery board

then what is the need of connecting those resistors in stm32f4 discovery board..and does VSS has a power supply now..which is usually connected to R27,R28

But R26,R28 resistors are placed on the PCB...in stm32f4 discovery board

waclawek.jan
Super User

VSS means ground.

Pin 99 of STM32F407VG used to have a different meaning in the very distant past, see PDR_ON pin not available on LQFP100 package for revision Z devices erratum.

JW