LNBH24 STMicroelectronics, LNBH24 Datasheet - Page 17

• Manufacturer Part Number: LNBH24
• Description: Dual LNB supply and control IC with step-up and I2C interface
• Manufacturer: STMicroelectronics

Table 6.
7.4
PCL
X
0
1
TTX
X
0
0
0
0
1
0
1
Truth table
X = don't care
All values are typical unless otherwise specified
Valid with TTX pin floating or connected GND
Diagnostic received data (I²C read mode) for both sections
A/B
The LNBH24 can provide to the 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 clock bits, the LNBH24 issues a byte
on the SDA data bus line (MSB transmitted first). At the ninth clock bit the MCU master can:
●
●
Three bits of the register are read back as a copy of the corresponding write output voltage
register status (LLC, VSEL, EN), while the other five bits convey diagnostic information
about the over-temperature (OTF), output voltage level (VMON), output overload (OLF),
minimum output current presence (IMON) and 22 kHz tone (TMON). 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
1
Acknowledge the reception, thus starting the transmission of another byte from the
LNBH24
No acknowledge, stopping the read mode communication
LLC VSEL EN
X
X
X
X
0
0
1
1
X
X
X
X
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
ITEST AUX
X
X
0
1
X
0
0
0
0
1
V
V
V
V
V
22 KHz controlled by DSQIN pin (only if TTX=1)
22 KHz tone output is always activated
V
V
Pulsed (dynamic) current limiting is selected
Static current limiting is selected
Minimum output current diagnostic threshold = 6mA typ.
Minimum output current diagnostic threshold = 12mA typ.
Power block disabled
oRX
oRX
oRX
oRX
oRX
oRX
oRX
= 13.4 V, V
= 18.5 V, V
= 14.4 V, V
= 19.5 V, V
= 22 V, V
output is ON, V
output is ON, V
UP
UP
UP
UP
UP
=22.75 V, (V
=14.15 V, (V
=19.25 V, (V
=15.15 V, (V
=20.25 V, (V
oTX
oTX
Function
Tone generator output is OFF
Tone generator output is ON
UP
UP
UP
UP
UP
-V
-V
-V
-V
-V
oRX
oRX
oRX
oRX
oRX
=0.75 V)
=0.75 V)
=0.75 V)
=0.75 V)
=0.75 V)
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