Hi there, Denny. I haven't looked at this part previously. But: it seems like massive=20 overkill for my application **plus** does not have constant-current=20 output. But I'll check pricing and see if it makes sense, even if I=20 have to add external current-limit resistors. I greatly appreciate the suggestion and hope that there are other=20 suggestions coming. Many thanks! dwayne At 01:03 PM 2/26/2019, Denny Esterline wrote: >I've not touched one, but I was reading the datasheet for an ST L99CL01XP >last week. >https://www.st.com/resource/en/datasheet/l99cl01xp.pdf >8 channel, high side, SPI and direct control, automotive voltage range. > >-Denny > > >On Tue, Feb 26, 2019 at 12:20 PM Dwayne Reid wrot= e: > > > Good day to all > > > > Several years ago, we purchased the assets of a LED clock > > manufacturer in our town. We wound up with several hundred 4-digit > > red LED displays used for clocks installed in schools and > > hospitals. Part number SK-2545D-24 > > > > Nice displays: digits are about 2-3/8" tall and > > decently-bright. That's the good. The bad is that these are > > direct-drive displays: no multiplexing **AND** they are > > common-cathode. This last really sucks. > > > > These are RED displays. Each segment has 3- red LEDs in series, the > > other dots are all single LED, including two individual LEDs for the co= lon. > > > > So: I'm looking for recommendations for a high-side LED display > > driver chip. I need something like 35 channels, preferably with > > constant-current output. The segments having three LEDs means that > > the driver needs to operate from at least 10 Vdc, preferably 12 > > Vdc. Assume around 20mA or less per LED or LED group. Serial SPI > > preferred but would accept I2C if that was the only option. > > > > Idea is to make a driver board for these displays that also holds a > > PIC and power supply. We can then either use these displays / driver > > board for our own projects or flog them to willing buyers. > > > > I'd ask on electronics.stackexchange.com but product recommendations > > are specifically prohibited on that site. > > > > Any suggestions greatly appreciated. > > > > Many thanks! > > > > dwayne > > > > -- > > Dwayne Reid > > Trinity Electronics Systems Ltd Edmonton, AB, CANADA > > 780-489-3199 voice 780-487-6397 fax 888-489-3199 Toll Free > > www.trinity-electronics.com > > Custom Electronics Design and Manufacturing > > > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > >-- >http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA 780-489-3199 voice 780-487-6397 fax 888-489-3199 Toll Free www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .