Datasheet

DocID13405 Rev 5 19/34

STP08DP05 Detection mode functionality

10.2 Phase two: “error detection“

The eight data bits must be set “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 micro controller switches the OE/DM2

to LOW, the device drives the

LEDs in order to analyze if an OPEN or SHORT condition has occurred.

The LEDs status will be detected at least in 1 microsecond and after this time the

microcontroller sets OE\DM2

in HIGH state and the output data detection result will go to the

microprocessor via SDO.

Detection mode and normal mode use both the same format data. 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-

entering in error detection mode.

Figure 18. Detection diagram