參數(shù)資料
型號(hào)： LNBH21PD
廠商： 意法半導(dǎo)體
英文描述： LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
中文描述： LNB電源與控制集成電路升壓轉(zhuǎn)換器和I2C接口
文件頁(yè)數(shù)： 3/20頁(yè)
文件大小： 493K
代理商： LNBH21PD
LNBH21
3/20
TABLE A: PIN CONFIGURATIONS
PIN N°
SYMBOL
NAME
FUNCTION
18
V
CC
Supply Input
8V to 15V IC supply. A 220μF bypass capacitor to GND with a 470nF
(ceramic) in parallel is recommended
External MOS switch Gate connection of the step-up converter
DC/DC Current Sense comparator input. Connected to current
sensing resistor
Input of the linear post-regulator. The voltage on this pin is monitored
by internal step-ut controller to keep a minimum dropout across the
linear pass transistor
RX Output to the LNB in DiSEqC 2.0 application. See truth tables for
voltage selections on page 8 and description on page 5.
Bidirectional data from/to I
2
C bus.
Clock from I
2
C bus.
When the TEN bit of the System Register is LOW, this pin will accept
the DiSEqC code from the main
μ
controller. The LNBH21 will use this
code to modulate the internally generated 22kHz carrier. Set to GND
this pin if not used.
22kHz Tone Detector Input. Must be AC coupled to the DiSEcQ 2.0
bus.
Open drain output of the tone Detector to the main
μ
controller for
DiSEcQ 2.0 data decoding. It is LOW when tone is detected.
External Modulation Input acts on V
O
TX. Needs DC decoupling to the
AC source. If not used, can be left open.
Pins Connected to Ground.
17
16
GATE
SENSE
External Switch Gate
Current Sense Input
19
V
UP
Step-up Voltage
2
V
O
RX
Output Port during
22KHz Tone RX
Serial Data
12
SDA
13
SCL
Serial Clock
14
DSQIN
DiSEqC Input
9
DETIN
Tone Detector Input
15
DSQOUT DiSEqC Output
5
EXTM
External Modulator
1, 6, 10,
11, 20
8
3
GND
Ground
BYP
ISEL
Bypass Capacitor
Current Limit Select
Needed for internal preregulator filtering
Set high or floating for Iout<=750mA, connect to ground for
I
OUT
≤
450mA.
Output of the linear post-regulator/modulator to the LNB. See truth
tables for voltage selections.
Four I
2
C bus addresses available by setting the Address Pin level
voltage. See address pin characteristics table.
4
V
O
TX
Output Port during
22KHz Tone TX
Address Setting
7
ADDR
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