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.
