Has anyone had any experiance with the Microchip HV5630 drivers?

[Joe Croft]

Hi Yall,

I was digging around mouse for serial to parallel converters when I ran across these Microchip drivers HV5630 @ https://www.mouser.com/datasheet/2/268/20005855A-1512677.pdf.

With two of these you could drive 6 digits without polling and have 4 extra lines left over for ne-2 lamps.

Are they as good as they look or am I missing something. They're cheap too and easily had solderable. Seems too good to be true

-joe

[John Rehwinkel]

> I was digging around mouse for serial to parallel converters when I ran across these Microchip drivers HV5630 @ https://www.mouser.com/datasheet/2/268/20005855A-1512677.pdf.
>
> With two of these you could drive 6 digits without polling and have 4 extra lines left over for ne-2 lamps.
>
> Are they as good as they look or am I missing something. They're cheap too and easily had solderable. Seems too good to be true

They take 12V logic levels, so would need a level shifter for use with ordinary 5V or 3.3V logic.

- John

[Joe Croft]

Hi John,

Ayeeeee..... I was looking the 8 channel push pull brother of this and it was 5 volt logic, sigh... I thought it was tooo easy, but maybe it won't be so bad, i's just a few leads needing shifted.

Thanks!
Joe

[Richard Scales]

There seem to be so many nearly identical products from Microchip. I have been experimenting the  HV5622 which has 32 outputs,etc.etc.etc - it is also available in SMD format if desired.

Yes, it needs (likes) 12V levels though on the bench right now I have one clocking away being driven entirely by a WeMos at 3V3 levels - totally out of spec I know. I plan to be shifting levels to 12V using 2N7000's for the 'real' thing - but they have not turned up yet!

It might help you to know (you may already know) that Microchip offer a 'samples' service so you could get some for 'evaluation' purposes.

Richard

[Kevin A.]

I've been using a few of the microchip high voltage serial to parallel converters in a number of projects. They are great and reduce component count significantly. 

Here are some of the major differences with the devices I've used for nixie applications. 

All the following are 32 bit (controlling 32 individual high voltage open drains):

- HV5522: 

220 volt rating

12 volt logic level - has been run at 5 and 8 volts VDD, YMMV

Shifting direction - clockwise viewed from top of package

Available packages - PQFP-44, PLCC-44

Power dissipation: 1.2 watts for both package types

Minimum ground current: 1.5 amps (duty cycle is limited by power dissipation)

- HV5530: 

300 volt rating

12 volt logic level - has been run at 5 and 8 volts VDD, YMMV

Shifting direction - clockwise viewed from top of package

Available packages - PQFP-44, PLCC-44

Power dissipation: 1.2 watts for both package types

Minimum ground current: 1.5 amps  

- HV5523:

220 volt rating  

5 volt logic level

Shifting direction - clockwise viewed from top of package 

Available packages - QFN-44

Power dissipation: 3.4 watts 

Minimum ground current: 1.5 amps   

- HV5622: 

Identical specs to HV5522 - shifts in opposite direction - counterclockwise from top of package

- HV5630: 

Identical specs to HV5530 - shifts in opposite direction - counterclockwise from top of package

  - HV5623:  

Identical specs to HV5523 - shifts in opposite direction - counterclockwise from top of package

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[gregebert]

Level-shifters, such as the MC14504, are cheap insurance to guarantee proper logic levels at the HVxxxx drivers. You can use a resistor-divider at the and of the serial chain to read the data back into your controller so that you can verify the integrity of the chain.. 

[Kevin A.]

It is important to note that there is large voltage drop across the tube. The potential difference between the cathode and ground is typically close to 100 volts less than the anode voltage. Meaning that for a typical tube, at 180 volts at the anode, the voltage between the active cathode(s) and ground would typically be around 80. These devices are overkill as far as voltage goes but again, they replace so many components it's almost a no brainer. Unless of course you want the aesthetic of 60 transistors on your board. 

[David Pye]

Also worth considering is the HV5622, which I've used in a couple of clock designs.

Also available in a PQFP package if you want to solder it onto the board.

Cheers

David

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[Joe Croft]

Thank you everyone!!!!

It shows you can have your cake and eat it too in this brave new world. And I though dual triodes were cat's meow back in the day ;)

(hehe... actually, I missed those days by a couple of years, but not to many.)

If yall are curious, I am dusting off my old nixie thermostat that was driven with an AVR and am going to remake it to be driven by a Raspberry pi, then I will be able to not only have a nice nixie tube thermostat, but I will be able to control it with my phone :)

The thermostat is in use as I type and yes, I make my wife guess which button does what ;)

-joe

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[newxito]

I use HV5622, they work great, even if daisy chaining 5 of them. I did not found an IC to shift the levels from 3.3V to 12V, so I use BSS138 mosfets with 10K resistors, that works for me.