STP08CDC596M(2005) Ver la hoja de datos (PDF) - STMicroelectronics

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STP08CDC596M
(Rev.:2005)

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

STMicroelectronics 

STP08CDC596

RUNNING THE DETECTION MODE

Phase One: “Entering In Detection Mode”

From the “Normal Mode” condition the device can

switch to the “Error Detection Mode” by a logic

Table 9: Entering In Detection Truth Table

sequence on the OE/DM2 and LE/DM1 pins as

showed in the following Table and Diagram:

CLK

1°

2°

3°

4°

5°

OE/DM2

H

L

H

H

H

LE/DM1

L

L

L

H

L

Figure 13: Entering In Detection Timing Diagram

After these five CLK cycles the device goes into

the” Error Detection Mode” and at the 6th rise front

of CLK the SDI data are ready for the sampling.

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

Figure 14: Detection Diagram

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.

9/20

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