STP08CDC596B1(2005) Ver la hoja de datos (PDF) - STMicroelectronics

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STP08CDC596B1
(Rev.:2005)

8-BIT CONSTANT CURRENT LED SINK DRIVER WITH FULL OUTPUT DETECTION

STMicroelectronics 

STP08CDC596

The LEDs status will be detected al least in 2

microseconds and after this time the micro

controller puts OE in HIGH state and the output

data detection result will go to the microprocessor

via SDO.

The detection data format is the same of data in

normal mode. As soon as all the detection data

bits are available on the serial line, the device may

go back to normal mode operation.

CONDITIONS IN ORDER TO GET A SUCCESSFULLY DETECTION CONDITION

Table 10: Detection Condition (VDD = 3.3 to 5 V Temp. Range -40 to 85°C)

SW-1 or SW-3b

SW-2 or SW-3a

Open Line or Output Short

to GND detected

Short on LED or Short to

V-LED detected

==> IODEC ≤ 0.5 x IO

==> VO ≥ 2.4 V

No error detected ==> IODEC ≥ 0.5 x IO

No error detected ==> VO ≤ 2.2 V

where: IO = the output current programmed by the REXT, IODEC = the detected output current in detection mode.

Figure 15: Detection Mode

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