STLED325 Datasheet, PDF (7/62 Pages) STMicroelectronics – Standby power management to host

STLED325
1
Description
Description
The STLED325 is a compact LED controller/driver that interfaces microprocessors to LED
displays through serial I²C interface. It drives LED connected in common anode con-
figuration. The STLED325 drives up to 40 discrete LEDs in 8 segment/5 digit configuration
while functioning from a supply voltage of 5 V. The maximum segment current for the display
digits is set through a single external resistor. Individual digits may be addressed and
updated without rewriting the entire display. Additionally it includes keyscanning for an 8 x 2
key matrix which automatically scans and de-bounces a matrix of up to 16 switches.
Furthermore, it provides standby power management to the host. The STLED325 also
integrates a low-power, highly-accurate RTC and a remote-control decoder. All functions are
pro-grammable using the I²C bus. Low power consumption during standby mode is
achieved. STLED325 supports numeric-type displays and reduces the overall BOM costs
through high integration. Also it provides ESD protection of greater than 2 kV HBM.
The LED controller/driver is ideal as a single peripheral device to interface the front panel
display with a single-chip Host IC like CPU.
Doc ID 17576 Rev 1
7/62