Datasheet

Pin configuration LNBH23L
8/25 Doc ID 15335 Rev 4
3 Pin configuration
Figure 2. Pin connections (bottom view)
Table 2. Pin description
Pin n° Symbol Name Pin function
19 V
CC
Supply input 8 to 15 V IC DC-DC power supply.
18 V
CC–
L Supply input 8 to 15 V analog power supply.
4 LX NMOS drain Integrated N-channel power MOSFET drain.
27 V
UP
Step-up voltage
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.
21 V
oRX
LDO output port
Output of the integrated low drop linear regulator. See truth
tables for voltage selections and description.
22 V
oTX
Output port for 22
kHz Tone TX
TX Output to the LNB. See truth tables for selection.
6 SDA Serial data Bi-directional data from/to I²C bus.
9 SCL Serial clock Clock from I²C bus.
12 DSQIN DiSEqC input
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.
14 TTX TTX enable
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.
29 Reserved Reserved To be connected to GND.
11 PDC Pull down control
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.
13 EXTM External modulation
External Modulation Input acts on V
oRX
linear regulator output
to superimpose an external 22 kHz signal. Needs DC
decoupling to the AC source. If not used it can be left floating.
5 P-GND Power ground DC-DC converter power ground.