LNBP电源和控制IC与升压转换器和I2C接口 LNBP SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE
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 down
converter in the antenna or to the multiswitch box. In this application field, it offers a complete
solution with extremely low component count, low power dissipation together with simple design and I2CTM standard interfacing.
■ COMPLETE INTERFACE BETWEEN LNB AND I2CTM BUS
■ BUILT-IN DC/DC CONTROLLER FOR SINGLE 12V SUPPLY OPERATION
■ ACCURATE BUILT-IN 22KHz TONE OSCILLATOR
■ SUITS WIDELY ACCEPTED STANDARDS
■ FAST OSCILLATOR START-UP FACILITATES DiSEqCTM ENCODING
■ BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqCTM
■ LOOP-THROUGH FUNCTION FOR SLAVE OPERATION
■ LNB SHORT CIRCUIT PROTECTION AND DIAGNOSTIC
■ CABLE LENGTH DIGITAL COMPENSATION
■ INTERNAL OVER TEMPERATURE PROTECTION
■ ESD RATING 4KV ON POWER INPUT-OUTPUT PINS