7-segment LED driver SAA1064 with +12V supply

Status
Not open for further replies.
K

kender

Advanced Member level 4
Joined
Jun 19, 2005
Messages
1,425
Helped
138
Reputation
276
Reaction score
39
Trophy points
1,328
Location
Stanford, SF Bay Peninsula, California, Earth, Sol
Activity points
10,035
Folks,

I’d like to power a 7-segment display with a +12V supply and control it with SAA1064. My I2C bus runs off +5V. Have read the datasheet. Typical supply voltage +5V, max +15V. I didn’t find any contraindication for using +12V power supply.

Have anyone tried this? Could anyone confirm?

Cheers,
- Nick
 

Since typical supply is 5.0V, minimum is 4.5V and maximum is 15.0V, you should be able to use 12V quite easily without any problem.

4.5 ≦ Supply Voltage ≦ 15.0V

Hope this helps.
Tahmid.
 

I don't think you should worry since 12V is within the max and min limits of the chip as stated in the datasheet. However, make sure that you have appropriate current limiting resistors for the 7-segments. Since they're running off 12V limited to Vf, they'll draw more current if you use the same resistor. So, take care regarding this. Besides this, you shouldn't worry.

By the way, why do you need to run it off 12V? You can just use 5V. 7-segment will work fine at 5V.

Hope this helps.
Tahmid.
 

Tahmid said:
By the way, why do you need to run it off 12V? You can just use 5V. 7-segment will work fine at 5V.
Click to expand...
My main supply voltage is +12V. My LED display can pull up to 0.6A. If I want to power it off +5V, I'd have to use a bigger regulator and dissipate more heat.
 

I think you can run it safely off 12V. If, however, you're still concerned, you can use a switching regulator and won't need to worry about much heat. A simple one is LM2575 - 5.0 .

Hope this helps.
Tahmid.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…