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 wrote= : > 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 colo= n. > > 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 > --=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 .