DocID15817 Rev 3

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STP16DPPS05

Error detection mode functionality

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7.2

Phase two: error detection

The 16 data bits must be set to “1” in order for all the outputs to be ON during error

detection. The data are latched by LE/DM1, after which the outputs are ready for the

detection process. When the microcontroller switches the OE/DM2 to LOW, the device

drives the LEDs to analyze if an OPEN or SHORT condition has occurred.

The status of the LEDs is detected in at least 1 microsecond, and after this period the

microcontroller sets OE/DM2 to HIGH state and the output data detection result is sent to

the microcontroller via SDO.

Error 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 return to normal mode of

operation. To re-detect the status, the device must first return to normal mode and reenter

error detection mode.

Figure 19. Detection diagram