LNBP21 Datasheet, PDF (1/20 Pages) STMicroelectronics – LNBP SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE

LNBP21
LNBP SUPPLY AND CONTROL IC WITH
STEP-UP CONVERTER AND I²C INTERFACE
s COMPLETE INTERFACE BETWEEN LNB
AND I2CTM BUS
s BUILT-IN DC/DC CONTROLLER FOR
SINGLE 12V SUPPLY OPERATION
s ACCURATE BUILT-IN 22KHz TONE
OSCILLATOR
s SUITS WIDELY ACCEPTED STANDARDS
s FAST OSCILLATOR START-UP FACILITATES
DiSEqCTM ENCODING
s BUILT-IN 22KHz TONE DETECTOR
SUPPORTS BI-DIRECTIONAL DiSEqCTM
s LOOP-THROUGH FUNCTION FOR SLAVE
OPERATION
s LNB SHORT CIRCUIT PROTECTION AND
DIAGNOSTIC
s CABLE LENGTH DIGITAL COMPENSATION
s INTERNAL OVER TEMPERATURE
PROTECTION
s ESD RATING 4KV ON POWER
INPUT-OUTPUT PINS
PowerSO-20
SO-20
DESCRIPTION
Intended for analog and digital satellite STB
receivers/SatTV, sets/PC cards, the LNBP21 is a
monolithic voltage regulator and interface IC,
assembled in SO-20 and PowerSO-20,
specifically designed to provide the power and the
13/18V, 22KHz tone signalling to the LNB
SCHEMATIC DIAGRAM
Gate
Sense
LNBP21
Step-up
Controller
Feedback
Vup
Vcc
Byp
Preregul.+
U.V.lockout
+P.ON res.
SDA
SCL
ADDR
DSQIN
I²C
interf.
Enable
I Select
V Select
Linear Post-reg
+Modulator
+Protections
Diagnostics
22KHz
Oscill.
Tone
Detector
LT1
LT2
OUT
EXTM
DETIN
DSQOUT
October 2002
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