2 Feb Atmel’s AT91SAM7X/ is a member of a series of highly The AT91SAM7X and AT91SAM7X differ only in memory sizes. AT91SAM7XAU Microchip Technology / Atmel ARM Microcontrollers – MCU kB Flash 64kB SRAM 55MHz 4 PWM datasheet, inventory, & pricing. AT91SAM7X Microchip Technology / Atmel ARM Microcontrollers – MCU datasheet, inventory, & pricing.

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The pullups are enabled on reset and are possibly powerfull enough to supply enough current through the ULN I know that the ULN is designed for 5V pegel, but 3,3V gives enough current to safely drive my relais. I’m used that GPIO come up with high impendancy and this behavour is really unexpected.


But then if you are running the relays at a higher at91sqm7x256 than the CPU, this won’t work either. Then the default state is for the transistor to be on and the internal pullup does not hurt. Simple cheap and compact.


Of course if you want the default state to be off so it doesn’t drive the relays, then you either need to use a pair of transistors or use a PNP transistor on the high side instead of an NPN on the low.

This pulse is a flat 3,3V at19sam7x256, no power up glitches or something. It turns on both FETs and can create problems.

AT91SAM7X microchipDIRECT

That’s what inverters are for. Create free account Forgot password? Arduino Robotics Lonnie Honeycutt. But in the meantime I’ve wt91sam7x256 a very dissapointing detail about the controller. BTW, the English is relays.

Welcome to the club. I was going to ask what your drive configuration was. I ended up using a hand full of Transistors to cover these issues properly.

Protecting the IoT with Invisible Keys. Looks like your PA inputs can source as much as uA of current. I don’t see any code piece in the startup ag91sam7x256 tampering with the GPIO.

A very minor nit. Introduction to Microcontrollers Mike Silva. I didn’t find an errata in the Atmel datasheet.


The only disadvantage of using the pull-down resistor to overdrive the pull-up is that you have to allow for the maximum pull-up current possible over temperature and process.

It seems that I need external pulldown to compensate them On Thu, Aug 16, at qt91sam7x256 So a 1 kohm pull-down should do the trick. Therefor use extra transistors – they do inverting for you for proper PowerUp. Sign in Sign in Remember me Forgot username or password? Embedded Software Engineer Loft Orbital’s mission is to make space simple for organizations that need My problem is that I get a high impulse at power on of about 25ms, which is enough for the relais to switch.