STAP08DP05 Datasheet, PDF (22/28 Pages) STMicroelectronics – Low voltage 8-bit constant current LED sink driver with output error detection for automotive applications

Detection mode functionality
STAP08DP05
10.4
Error detection conditions
V_DD = 3.3 to 5 V temperature range 25 °C.
Table 14. Detection conditions
Configuration
Detect mode
Detection results
SW-1 or SW-3b
Open line or output
short to GND detected
==> I_ODEC ≤ 0.5 x I_O
No error
detected
SW-2 or SW-3a
Short on LED or short
to V-LED detected
==> V_O ≥ 2.5V
No error
detected
==> I_ODEC ≥ 0.5 x I_O
==> V_O ≤ 2.2 V
Note:
Where: I_O = the output current programmed by the R_EXT, I_ODEC = the detected output
current in detection mode.
Figure 20. Detection circuit
V-LED
V-LED
SW-2
SW-1
SW-3a
SW-3b
OUT-0 1
2
3
4
5
STAP08DP05
AM13662V1
22/28
DocID024305 Rev 6