Hi there, Brent. Unfortunately, this appears to be a sinking driver rather than=20 sourcing. But that does remind me to check what other devices that=20 TI might have available. Many thanks! dwayne At 03:35 PM 2/26/2019, Brent Brown wrote: >The TLC5940 may be worth looking at. 16-Channel LED Driver With DOT >Correction and Grayscale PWM Control. Serial data interface (which I=20 >guess is SPI >like). I've designed them into a PCB before on a customers request,=20 >but I didn't >have to do the programming. > >http://www.ti.com/lit/ds/symlink/tlc5940.pdf > >On 26 Feb 2019 at 12:19, 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 > > colon. > > > > 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 --=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 .