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ST7LNB0 Arkusz danych(PDF) 3 Page - STMicroelectronics

Numer części ST7LNB0
Szczegółowy opis  Diseqc TM 2.1 Slave Microsontroller for LNBs and Switchers
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7LNB0 Arkusz danych(HTML) 3 Page - STMicroelectronics

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2 ST7LNB0 IMPLEMENTATION
The following figure shows a typical application circuit for the ST7LNB0:
Figure 3 ST7LNB0 typical application circuit
Notes:
1.The divider chain connected to the DRX pin must have the following resistance values: 330K
and
100K
.
2.The reset circuitry linked to the RESET pin is optional, in fact the ST7LNB0 has an internal voltage level
detector LVD which generates a static reset when the VDD supply is below a threshold voltage of 4.1 V.
3.The DiSEqC signalling must have a tone frequency of 22KHz(+/- 20%) and an amplitude exceeding 150
mV peak to peak.
4. When the LVD is enabled (default state), it is mandatory not to connect a pull-up resistor. A 10nF pull-
down capacitor is recommended to filter noise on the reset line.
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2
3
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16
15
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10
9
ST7LNB0
CONTROL
F-CONNECTOR
4.7K (4)
10n
100K
330K
LNB / SWITCHER
CONTROL
SBY
LNB / SWITCHER
(Uncommitted SW)
(Committed SW)
2.2 nF
2N2222
OPTIONAL
1


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