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AN3981 データシート(PDF) 13 Page - STMicroelectronics

部品番号 AN3981
部品情報  LED array drivers
PDF  54 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3981 データシート(HTML) 13 Page - STMicroelectronics

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AN3981
8-bit LED array drivers
Doc ID 022217 Rev 1
13/54
Figure 10.
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 STP08DP05 can detect these faulty conditions (in
accordance with the detection thresholds of Table 1) and provide the results of the detection
as an “Error status code” coming out of the SDO pin (see Figure 11), with “0” logic level
indicating a faulty channel, whereas a “1” logic level indicates a “good” channel.
Table 1.
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 = 2.5 V
LED short-circuit or LED shorted to supply voltage
VO = 2.2 V
No error detected



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