This application note describes the features and characteristics of the STP16xPPx05 family of LED drivers, with particular focus on two important features: output error detection and auto power-saving.
The document introduces the STP16DPPS05 device from STMicroelectronics, a monolithic low-voltage shift register designed to drive LEDs with regulated currents between 3-40 mA. It details the normal mode functionality where serial data is transferred and latched to control LED outputs via external resistors.
A significant portion of the note covers two key features: output error detection for identifying open-circuit or short-circuit conditions, and an auto power-saving feature that reduces current consumption when the device is not actively managing data. The text includes timing diagrams and sequences for switching between normal operation and diagnostic modes.
The device provides a regulated constant current ranging from 3 to 40 mA.
The acquisition time necessary to allow for correct LED feedback is typically 1 us.