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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It seems that I need external pulldown to compensate them So a 1 kohm pull-down should do the trick.

at91sam7x Stock and Price by Distributor

A very minor nit. On Thu, Aug 16, at Introduction to Microcontrollers Mike Silva. I didn’t find an errata in the At91samx256 datasheet.

Create free account Forgot password? Of course if you want the default state to be off so it doesn’t drive the relays, at91sa,7×256 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.


But in the meantime I’ve noticed a very dissapointing detail about the controller.

My problem is that I get a high impulse at power on of about 25ms, which is enough for the relais to switch. BTW, the English is relays. Sign in Sign in Remember me Forgot username or password?

Protecting the IoT with Invisible Keys. Then the default state is for the transistor to be on and the internal pullup does not hurt. This pulse is a flat 3,3V signal, no power up glitches or something. I don’t see any code piece in the startup code tampering with the GPIO. Welcome to the club.

I know that the ULN is designed for 5V pegel, but 3,3V gives enough current to safely drive my relais. Simple cheap and compact. Therefor use extra transistors – they do inverting for you for proper PowerUp.

Can not boot from the AT91SAM7x256

That’s what inverters are for. Embedded Software Engineer Loft Orbital’s mission is to make space simple for organizations that need But at91dam7x256 if you are running the relays at a higher voltage than the CPU, this won’t work either.

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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 ag91sam7x256 and process. I was going to ask what your drive configuration was. I ended up using a hand full of Transistors to cover these issues properly. Arduino Robotics Lonnie Honeycutt.

It turns on both FETs and can create problems. The pullups are enabled on reset and are possibly powerfull enough to supply enough current through the ULN I’m used that GPIO come up with high impendancy and this behavour is really unexpected. Looks like your PA inputs can source as much as uA of current.