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AN3981 Fiches technique(PDF) 21 Page - STMicroelectronics

No de pièce AN3981
Description  LED array drivers
PDF  54 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3981 Fiches technique(HTML) 21 Page - STMicroelectronics

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AN3981
16-bit LED array drivers
Doc ID 022217 Rev 1
21/54
Figure 21.
Fault conditions detected by error detection mode: a) shorted LED; b)
open LED; c) short-circuit from current generator to VLED; d) open
channel; e) short-circuit from current generator to GND
The diagnostic circuitry embedded in the STP16DPxy05 can detect these faulty conditions
(in accordance with the detection thresholds of Table 3) and provide the results of the
detection as an “Error status code” coming out of the SDO pin (see Figure 22), with “0” logic
level indicating a faulty channel, whereas “1” logic level indicates a “good” channel.
Figure 22.
Error status code
Table 3.
Detection conditions
Detection conditions
Detection result
IODEC
(1) = 0.5·I
O
(2)
1.
IODEC is the detected output current in detection mode.
2.
IO is the programmed output current.
Open channel or output short to GND detected
IODEC = 0.5·IO
No error detected
VO = 2.4 V
Short on LED or short to LED supply voltage
VO = 2.2 V
No error detected



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