STAP08DP05 Datasheet, PDF (20/28 Pages) STMicroelectronics – Low voltage 8-bit constant current LED sink driver with output error detection for automotive applications

Detection mode functionality
STAP08DP05
10.2
Phase two: “error detection mode“
The eight data bits must be set to “1” in order to set ON all the outputs during detection. The
data are latched by LE/DM1 and after that the outputs are ready for the detection process.
When the microcontroller switches OE/DM2 to LOW, the device drives the LEDs in order to
analyze if an OPEN or SHORT condition has occurred.
Figure 18. Detection diagram
The status of the LEDs will be detected in 1 microsecond (minimum) 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 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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