LNBH23L STMicroelectronics, LNBH23L Datasheet - Page 17

• Manufacturer Part Number: LNBH23L
• Description: LNB supply and control IC with step-up and I2C interface
• Manufacturer: STMicroelectronics

LNBH23L
Table 6.
7.4
PCL
X
0
1
TTX
X
X
X
0
0
0
0
0
1
1
0
1
Truth table
X = don't care
All values are typical unless otherwise specified
Valid with TTX pin floating
Diagnostic received data (I²C read mode)
LNBH23L can provide to the MCU master a copy of the diagnostic system register
information via I²C bus in read mode. The read mode is master activated by sending the
chip address with R/W bit set to 1. At the following master generated clocks bits, LNBH23L
issues a byte on the SDA data bus line (MSB transmitted first). At the ninth clock bit the
Master can:
●
●
Three bits of the register are read back as a copy of the corresponding write output voltage
register status (LLC, VSEL, EN), two bits convey diagnostic information about the over-
temperature (OTF), output over-load (OLF) and three bit are for internal usage (TEST1-2-3)
and must be disregarded by the MCU software. In normal operation the diagnostic bits are
set to zero, while, if a failure is occurring, the corresponding bit is set to one. At start-up all
the bits are reset to zero.
TEN
X
0
0
1
Acknowledge the reception, starting in this way the transmission of another byte from
the LNBH23L
No acknowledge, stopping the read mode communication
LLC
0
0
1
1
X
VSEL
X
0
1
0
1
EN TEST4 TEST5
1
1
1
1
1
1
1
1
1
1
1
0
Doc ID 15335 Rev 4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
V
V
V
V
Internal 22 kHz generator disabled, EXTM
modulation enabled
Internal 22 kHz controlled by DSQIN pin (only if
TTX=1)
Internal 22 kHz tone output is always activated
V
OFF
V
ON
Pulsed (Dynamic) current limiting is selected
Static current limiting is selected
Power block disabled
oRX
oRX
oRX
oRX
oRX
oRX
= 13.4 V, V
= 18.4 V, V
= 14.4 V, V
= 19.5V, V
output is ON, V
output is ON, V
LNBH23L software description
UP
UP
UP
UP
=20.6 V, (V
=15.5 V, (V
= 14.5 V, (V
= 19.5 V, (V
Function
oTX
oTX
Tone generator output is
Tone generator output is
UP
UP
UP
UP
-V
-V
oRX
- V
- V
oRX
oRX
oRX
=1.1 V)
=1.1 V)
= 1.1 V)
= 1.1 V)
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