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參數(shù)資料
| 型號(hào)： | Q67007-A5112 |
| 廠商： | SIEMENS AG |
| 英文描述： | Video and Sound IF with FM-PLL Demodulator, AFC and V & S SCART |
| 中文描述： | 視頻和聲音中頻與調(diào)頻鎖相環(huán)解調(diào)器，亞足聯(lián)和V |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大小： | 284K |
| 代理商： | Q67007-A5112 |
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BTS 7741 G
Data Sheet
6
2003-03-06
Open Load Detection
Open load is detected by voltage measurement in Off state. If the output voltage exceeds
a specified level the error flag is set with a delay.
Status Flag
The status flag output is an open drain output with Zener-diode which requires a pull-up
resistor, c.f. the application circuit on page 14. Various errors as listed in the table
“Diagnosis” are detected by switching the open drain output ST to low. An open load
detection is available when there is an external resistor < R
0
from SH1 and SH2 pin to
DHVS or Vs. In order to reach low quiescent current, we recommend to disconnect this
resistor when not used.
2
Truth table and Diagnosis (valid only for the High-Side-Switches)
Flag
IH1
IH2
SH1
SH2
ST Remarks
Inputs
Outputs
Normal operation;
identical with functional truth table
0
0
1
1
0
1
0
1
L
L
H
H
L
H
L
H
1
1
1
1
stand-by mode
switch2 active
switch1 active
both switches
active
Open load at high-side switch 1
Open load at high-side switch 2
0
1
X
X
X
X
0
1
Z
H
X
X
X
X
Z
H
0
1
0
1
detected
detected
Overtemperature high-side switch1
0
1
X
X
L
L
X
X
1
0
detected
Overtemperature high-side switch2
X
X
0
1
X
X
L
L
1
0
detected
Overtemperature both high-side switches
0
X
1
0
1
X
L
L
L
L
L
L
1
0
0
detected
detected
Under voltage
X
X
L
L
1
not detected
Inputs:
Outputs:
Status:
0 = Logic LOW
Z = Output in tristate condition
1 = No error
1 = Logic HIGH
L = Output in sink condition
0 = Error
X = don’t care
H = Output in source condition
X = Voltage level undefined
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