Hi Tobias, This document is very interesting. Thanks. The design I saw on the internet (http://ad7zj.net/kd7lmo/hardware/nixie_page2.gif) is slightly different (he also use BSS138). I think this one is not bidirectional.
Even if it is not necessary, I prefer to use your design. Antoine On 02 Jun 2012, at 19:09, Tobias wrote: > Antoine > > I am using the HV5522 on my clock and multimeter projects. Using both > SPI (for the HV5522) and I2C bus level shift. > The voltage for the HV5522 is the same that powers the boost > converter. I tested both 9 and 12V and it works just fine. > I based my design on this app note: > > http://ics.nxp.com/support/documents/interface/pdf/an97055.pdf > > The document describes a bi-directional level shifter but it works > just fine when communication is uni-directional like with the HV5522. > For the FETs I chose BSS138 as they are inexpensive. > > Regards > Tobias > > > > > On 1 jun, 07:53, Antoine Vanoutryve <[email protected]> wrote: >> Hi Terry. >> >> Indeed I found only one schematic using 12V. Most of schematics available >> on Google use 5V. That's why I preferred to ask. I will use 12V with >> transistors then. >> >> Thank you for your reply. >> >> Antoine >> >> On 01 Jun 2012, at 13:48, Terry S wrote: >> >> >> >> >> >> >> >>> The datasheet does not indicate an operating supply voltage of -0.5 to >>> +15v, those are the absolute maximum ratings. >> >>> Use the part within it's recommended ratings of 10.8 to 13.2 volts and >>> you won't have any issues. Otherwise, all bets are off. >> >>> It never ceases to amaze me when people use a part outside it's spec >>> and then wonder why they have problems. Would you use a lawnmower to >>> trim your hedge? Your weed whip to cut down a tree? >> >>> Terry >> >>> On Jun 1, 6:06 am, Pengouin <[email protected]> wrote: >>>> Hi, >> >>>> I intend to use Supertex HV5522 to build a Nixie clock with four IN-18 >>>> tubes. I found some schematics on the Internet. Some use 5V directly >>>> connected to HV5522 and some use higher voltages (12V) with a field effect >>>> transistor connected to a 5V MCU. I plan on using a PIC MCU running at 3.3V >>>> to drive my HV5522. The datasheet seems to indicate that I can use any >>>> voltage between -0.5V to +15 V, but the recommended voltage is 10V to 13V. >> >>>> Does anyone uses HV5522 connected directly in 3.3? Is it working correctly? >> >>>> Thanks for your help >> >>>> Antoine >> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "neonixie-l" group. >>> To post to this group, send an email to [email protected]. >>> To unsubscribe from this group, send email to >>> [email protected]. >>> For more options, visit this group >>> athttp://groups.google.com/group/neonixie-l?hl=en-GB. >> >> >> >> signature.asc >> < 1KVisualizarFazer download > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To post to this group, send an email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/neonixie-l?hl=en-GB. >
signature.asc
Description: Message signed with OpenPGP using GPGMail
