LNBH23L STMicroelectronics, LNBH23L Datasheet - Page 8

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

Pin configuration
3
Figure 2.
Table 2.
8/25
Pin n°
19
18
27
21
22
12
14
29
11
13
4
6
9
5
Pin configuration
Pin connections (bottom view)
Pin description
Reserved
Symbol
DSQIN
P-GND
V
EXTM
V
PDC
V
SDA
SCL
TTX
V
V
CC–
LX
oRX
oTX
CC
UP
L
External modulation
Output port for 22
Pull down control
LDO output port
Step-up voltage
Power ground
DiSEqC input
kHz Tone TX
Supply input
Supply input
NMOS drain
Serial clock
TTX enable
Serial data
Reserved
Name
Doc ID 15335 Rev 4
8 to 15 V IC DC-DC power supply.
8 to 15 V analog power supply.
Integrated N-channel power MOSFET drain.
Input of the linear post-regulator. The voltage on this pin is
monitored by the internal step-up controller to keep a minimum
dropout across the linear pass transistor.
Output of the integrated low drop linear regulator. See truth
tables for voltage selections and description.
TX Output to the LNB. See truth tables for selection.
Bi-directional data from/to I²C bus.
Clock from I²C bus.
This pin will accept the DiSEqC code from the main µController.
The LNBH23L will use this code to modulate the internally
generated 22 kHz carrier. Set to ground if not used.
This pin can be used, as well as the TTX I²C bit of the system
register, to control the TTX function enable before to start the
22 kHz tone transmission. Set floating or to GND if not used.
To be connected to GND.
To be connected to the external NPN transistor Base to reduce
the 22 kHz tone distortion in case of heavy capacitive load at
light output current. If not used it can be left floating.
External Modulation Input acts on V
to superimpose an external 22 kHz signal. Needs DC
decoupling to the AC source. If not used it can be left floating.
DC-DC converter power ground.
Pin function
oRX
linear regulator output
LNBH23L