STAP16DPS05 Datasheet, PDF (19/34 Pages) STMicroelectronics – Low voltage 16-bit constant current LED sink driver

STAP16DPS05
Detection mode functionality
7.2
Phase two: “error detection”
The 16 data bits must be set to “1” in order to set ON all the outputs during the detection.
The data are latched by LE/DM1 and after that the outputs are ready for the detection
process. When the microcontroller switches the OE/DM2 to LOW, the device drives the
LEDs in order to analyze if an OPEN or SHORT condition has occurred.
Figure 15. Detection diagram
The LED status is detected at least in 1 microsecond (minimum) and after this time the
microcontroller sets OE/DM2 in high state and the output data detection result goes to the
microprocessor via SDO.
Detection mode and normal mode both use the same data format. As soon as all the
detection data bits are available on the serial line, the device may go back to normal mode
of operation. To re-detect the status, the device must go back in normal mode and re-enter
error detection mode.
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