STP08DP05XTTR Ver la hoja de datos (PDF) - STMicroelectronics

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STP08DP05XTTR

Low voltage 8-bit constant current LED sink with full outputs error detection

STMicroelectronics 

STP08DP05

Detection mode functionality

10.3

Phase three: “resuming to normal mode”

The sequence for re-entering in normal mode is showed in the following table and diagram:

Table 13. Resuming to normal mode timing diagram

CLK

1°

2°

3°

4°

5°

OE/DM2

H

L

H

H

H

LE/DM1

L

L

L

L

L

Figure 19. Resuming to normal mode timing diagram

Note:

For proper device operation the “entering in detection” sequence must be follow by a

“resume mode” sequence, isn’t possible to insert consecutive equal sequence.

10.4

Note:

Error detection conditions

VDD = 3.3 to 5 V temperature range 25 °C.

Table 14. Detection condition

SW-1 or SW-3b

Open line or output

short to GND detected

==> IODEC  0.5 x IO

No error

detected

SW-2 or SW-3a

Short on LED or short

to V-LED detected

==> VO  2.5V

No error

detected

==> IODEC  0.5 x IO

==> VO  2.2 V

Where: IO = the output current programmed by the REXT,

IODEC = the detected output current in detection mode.

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