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LNBEH21 Fiches technique(PDF) 11 Page - STMicroelectronics

No de pièce LNBEH21
Description  LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE
PDF  22 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LNBEH21 Fiches technique(HTML) 11 Page - STMicroelectronics

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LNBEH21
11/22
DiSEqC COMMUNICATION TRUTH TABLE (TEN/VSEL pin controls the internal 22KHz Tone)
13/18V CONTROL WORD COMMUNICATION TRUTH TABLE (TEN/VSEL pin function depends on
VOM bit state)
GENERAL FEATURES TRUTH TABLE
X = don’t care; values are typical unless otherwise specified.
PCL
TTX
OM
LLC
VOM
EN
OTF
OLF
Function
0001
X
X
VO = 13.25 V and VUP = 15.45 V
TEN/VSEL = HIGH 22KHz Enabled
TEN/VSEL = LOW 22KHz Disabled
0011
X
X
VO = 19.5V and VUP= 21.7 V
TEN/VSEL = HIGH 22KHz Enabled
TEN/VSEL = LOW 22KHz Disabled
0101
X
X
VO = 14.25 V and VUP = 16.45 V
TEN/VSEL = HIGH 22KHz Enabled
TEN/VSEL = LOW 22KHz Disabled
0111
X
X
VO = 20.5 V and VUP = 22.7 V
TEN/VSEL = HIGH 22KHz Enabled
TEN/VSEL = LOW 22KHz Disabled
PCL
TTX
OM
LLC
VOM
EN
OTF
OLF
Function
1001
X
X
TEN/VSEL pin controls both the LNB output voltage and
the DC/DC Converter Voltage (VUP)
TEN/VSEL = LOW, VO = 13.25 V and VUP = 15.45 V
TEN/VSEL = HIGH, VO = 19.5V and VUP= 21.7 V
1011
X
X
TEN/VSEL pin controls only the LNB output voltage and the
DC/DC Converter output is forced always at 21.7 V
TEN/VSEL = LOW, VO = 13.25 V and VUP = 21.7 V
TEN/VSEL = HIGH, VO = 19.5V and VUP= 21.7 V
1101
X
X
TEN/VSEL pin controls both the LNB output voltage and
the DC/DC Converter Voltage (VUP)
TEN/VSEL = LOW, VO = 14.25 V and VUP = 16.45 V
TEN/VSEL = HIGH, VO = 20.5V and VUP= 22.7 V
1111
X
X
TEN/VSEL pin used to set only the LNB output voltage.
DC/DC Converter output voltage forced always at 22.7 V
TEN/VSEL = LOW, VO = 14.25 V and VUP = 22.7 V
TEN/VSEL = HIGH, VO = 20.5V and VUP= 22.7 V
PCL
TTX
OM
LLC
VOM
EN
OTF
OLF
Function
0X
1X
X
When TTX = 0 the device is set in receiving mode, the TX
output is partially OFF the VORX pin is ON:
VOTX = OFF, VORX = ON
1X
1X
X
When TTX = 1 the device is set in receiving mode, the RX
output is partially OFF the VOTX pin is ON:
VOTX = ON, VORX = OFF
0
1
X
X
Pulsed (dynamic) current limiting is selected
1
1
X
X
Static current limiting is selected
X
XXXX
0
X
X
Power blocks disabled



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