LNBH221

LNBH221 DUAL LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE PRELIMINARY DATA s s s s s s s s s s s s s s ALL THE FEATURES ARE THE SAME FOR BOTH SECTION COMPLETE AND INDEPENDENT INTERFACE BETWEEN LNBs AND RELEVANT I2CTM BUS BUILT-IN DC/DC CONTROLLER FOR SINGLE 12V SUPPLY OPERATION AND HIGH EFFICIENCY (Typ. 93% @ 500mA) LNB OUTPUT CURRENT GUARANTEED UP TO 500mA BOTH COMPLIANT WITH EUTELSAT AND DIRECTV OUTPUT VOLTAGE SPECIFICATION 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 2.0 SEMI-LOWDROP POST REGULATOR AND HIGH EFFICIENCY STEP-UP PWM FOR LOW POWER LOSS: Typ. 0.56W @ 125mA TWO OUTPUT PINS SUITABLE TO BYPASS THE OUTPUT R-L FILTER AND AVOID ANY TONE DISTORSION (R-L FILTER AS PER DiSEqC 2.0 SPECs, see application circuit on pag. 4) OVERLOAD AND OVER-TEMPERATURE INTERNAL PROTECTIONS OVERLOAD AND OVER-TEMPERATURE I2C DIAGNOSTIC BITs LNB SHORT CIRCUIT SOA PROTECTION WITH I2C DIAGNOSTIC BIT +/- 4KV ESD TOLERANT ON INPUT/ OUTPUT POWER PINS PowerSO-36 tremely low component count, low power dissipation together with simple design and I2CTM standard interfacing. BLOCK DIAGRAM Gate Sense Step-up Controller LNBH221- section A VoTX Vup Vcc Byp Preregul.+ U.V.lockout +P.ON res. VoRX Linear Post-reg +Modulator +Protections Diagn. EXTM SDA SCL ADDR V Select I²C Enable TEN DSQIN 22KHz Oscill. Tone Detector DETIN DSQOUT Gate Sense Step-up Controller LNBH221- section B VoTX Vup Vcc Preregul.+ U.V.lockout +P.ON res. VoRX DESCRIPTION Intended for analog and digital DUAL Satellite STB receivers/SatTV, sets/PC cards, the LNBH221 is a voltage regulator and interface IC, assembled in POWER SO-36, specifically designed to provide the power 13/18V, and the 22KHz tone signalling for two independent LNB down converters or to a multiswitch box that could be independently powered and set. In this application field, it offers a complete solution with exApril 2004 Byp Linear Post-reg +Modulator +Protections Diagn. EXTM SDA SCL ADDR V Select I²C Enable TEN DSQIN 22KHz Oscill. Tone Detector DETIN DSQOUT 1/18 This is preliminary information on a new product now in development are or undergoing evaluation. Details subject to change without notice. LNBH221 ABSOLUTE MAXIMUM RATINGS Symbol VCC VUP VOTX/RX IO VI VDETIN VOH IGATE VSENSE Tstg TJ DC Input Voltage DC Input Voltage DC Output Pin Voltage Output Current Logic Input Voltage (SDA, SCL, DSQIN) Detector Input Signal Amplitude Logic High Output Voltage (DSQOUT) Gate Current Current Sense Voltage Storage Temperature Range Operating Junction Temperature Range Parameter Value -0.3 to 16 -0.3 to 25 -0.3 to 25 Internally Limited -0.3 to 7 -0.3 to 2 -0.3 to 7 ±400 -0.3 to 1 -0.3 to 7 -40 to 150 -40 to 125 Unit V V V mA V VPP V mA V V °C °C VADDRESS Address Pin Voltage Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA Symbol Rthj-case Parameter Thermal Resistance Junction-case Value 2 Unit °C/W PIN CONFIGURATION (top view) 2/18 LNBH221 TABLE A: PIN CONFIGURATIONS PIN NUMBER SECT: A VCC GATE SENSE VUP Supply Input External Switch Gate Current Sense (Input) Step-up Voltage 8V to 15V 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. Current Sense comparator input. Connected to current sensing resistor. 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. RX Output to the LNB in DiSEqC 2.0 application. See truth table for voltage selections and description on page 5. Bidirectional data from/to I2C bus. 8 7 6 9 B 26 25 24 27 SYMBOL NAME FUNCTION VORX SDA SCL DSQIN Output Port during 22KHz Tone RX Serial Data Serial Clock DiSEqC Input 28 2 10 20 DETIN Detector In DSQOUT DiSEqC Output EXTM GND BYP VOTX GND ADDR External Modulation Ground Bypass Capacitor pin Output Port during 22KHz Tone TX Ground Address Setting 3 21 Clock from I2C bus. When the TEN bit of the System Register is LOW, this pin 4 22 will accept the DiSEqC code from the main µcontroller. Each section of the LNBH221 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 35 17 DiSEqC bus. Open drain output of the Tone Detector to the main 5 23 µcontroller for DiSEqC data decoding. It is LOW when tone is detected on the DETIN. External Modulation Input. Needs DC decoupling to the 31 13 AC source. If not used, can be left open. Circuit Ground. It is internally connected to the die frame 1, 14, 18, 1, 14, 18, for heat dissipation. 19, 32, 36 19, 32, 36 Needed for internal pre regulator filtering. 34 16 Output of the linear post regulator/modulator to the LNB. 30 12 See truth table for voltage selections. To be connected to ground. 29 11 2 33 15 Four I C bus addresses available by setting the Address Pin level voltage. 3/18 LNBH221 TYPICAL APPLICATION CIRCUITS FOR EACH SECTION : A and B Axial Ferrite Bead Filter F1 suggested part number: MURATA BL01RN1-A62 Panasonic EXCELS A35 D1 1N4001 IC1 F1 Vup C9 220µF IC2 C2 220µF STN4NF03L C3 470nF Ceramic VoRX Set TTX=1 to LNB Gate VoTX LNBH221 L1=22µH Rsc 0.1 Ω C4 470nF Ceramic Vcc Vin 12V C1 220µF SDA SCL DSQIN Tone Enable GND EXTM Address DSQOUT Sense (**) DETIN C5 10nF D2 BAT43 Section A and B Byp C5 470nF 0