Low power relay

[Scarr]

Hi all,

I want to switch 2A @ 3.4-3.9v with a ATtiny13 MCU what is the best way t do this with the least components, SSR, Relay? Ideally I want a pin from MCU to pin of XXX that is then used to switch the voltage on/off

Thx

 

[Optikon]

Hi all,

I want to switch 2A @ 3.4-3.9v with a ATtiny13 MCU what is the best way t do this with the least components, SSR, Relay? Ideally I want a pin from MCU to pin of XXX that is then used to switch the voltage on/off

Thx

Look for SSR. you buy those to switch your mentioned conditions.
They typically have a diode on input with a series limiting resistor and only require about 10mA to drive. The resistor can be very small.

 

[Scarr]

The ones I have found are 3v and my I/O Pin will be 2.5v

Hi,

I will be running the MCU at between 3.4v and 3.6v and the spec sheet for the ATtiny13 says that at 3v the min output voltage from a I/O pin will be 2.5v (page 119 of the spec sheet) it does not give a typical or max voltage and I can't see a graph that gives a I/O voltage based on VCC.
Having said that, the PDF is a little confusing for a novice like me so it might be in there.

All the SSR I have found require 3v to turn them on.

Thx

 

[Optikon]

Re: The ones I have found are 3v and my I/O Pin will be 2.5v

Hi,

I will be running the MCU at between 3.4v and 3.6v and the spec sheet for the ATtiny13 says that at 3v the min output voltage from a I/O pin will be 2.5v (page 119 of the spec sheet) it does not give a typical or max voltage and I can't see a graph that gives a I/O voltage based on VCC.
Having said that, the PDF is a little confusing for a novice like me so it might be in there.

All the SSR I have found require 3v to turn them on.

Thx

umm look at this guy. Mosfet isolated SSR

**broken link removed**

Its small, you can drive the LED with 10mA so 3V I/O is fine. It can switch 2A

 

[Scarr]

Positive side switching

Thnaks Optikon for that,

looking at the spec it shows switching on the negative side, I want to switch on the live sideis this OK with this device?

Thx

 

[Scarr]

Does anyone know?

Does anyone know if I can use the above mosfet relay on the positive supply to the load?

 

[Sebi]

I cannot open the link, but if te input is optoisolated, it work.

 

[Scarr]

Found another link to it

Hi sebi,

here is another link I found to it, can you check it please and comment?

http://www.europe.omron.com/Images/en/165_19405.pdf

Thx

 

[Optikon]

Re: Found another link to it

Hi sebi,

here is another link I found to it, can you check it please and comment?

http://www.europe.omron.com/Images/en/165_19405.pdf

Thx

This one will work too!
Driving an LED is easy for a digital part.