LNBH26LPQR STMicroelectronics

LNBH26L Dual LNBS supply and control IC with step-up and IC interface Features Complete interface between LNB and IC bus Built-in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93% 0.5 A) Selectable output current limit by external resistor Compliant with main satellite receiver output voltage specification (8 programmable levels) QFN24 (4x4 mm) Accurate built-in 22 kHz tone generator suits widely accepted standards 22 kHz tone waveform integrity guaranteed also at no load condition Low-drop post regulator and high efficiency step-up PWM with integrated power N-MOS Description allowing low power losses Intended for analog and digital DUAL satellite Overload and overtemperature internal receivers/Sat-TV, Sat-PC cards, the LNBH26L is protection with IC diagnostic bits a monolithic voltage regulator and interface IC, LNB short-circuit dynamic protection assembled in QFN24 (4x4) specifically designed to provide the 13 / 18 V power supply and the 22 +/- 4 kV ESD tolerant on output power pins kHz tone signalling to the LNB down-converter in the antenna dishes or to the multi-switch box. In Applications this application field, it offers a complete solution for dual tuner satellite receivers with an extremely STB satellite receivers low component count and low power dissipation TV satellite receivers together with simple design and IC standard PC card satellite receivers interfacing. Table 1. Device summary Order code Package Packaging LNBH26LPQR QFN24 (4x4) Tape and reel March 2012 Doc ID 022876 Rev 1 1/28 www.st.com 28Contents LNBH26L Contents 1 Block diagram 3 2 Application information (valid for each section A/B) . 4 2.1 DISEQC data encoding (DSQIN pin) . 4 2.2 Data encoding by external 22 kHz tone TTL signal 4 2.3 Data encoding by external DiSEqC envelope control through the DSQIN pin 5 2.4 Output current limit selection . 5 2.5 Output voltage selection . 6 2.6 Diagnostic and protection functions 6 2.7 Surge protection and TVS diodes . 6 2.8 Power-on IC interface reset and undervoltage lockout . 7 2.9 PNG: input voltage minimum detection . 7 2.10 OLF: overcurrent and short-circuit protection and diagnostic . 7 2.11 OTF: thermal protection and diagnostic . 7 3 Pin configuration 9 4 Maximum ratings . 11 5 Typical application circuits 12 6 IC bus interface . 13 6.1 Data validity . 13 6.2 START and STOP condition . 13 6.3 Byte format 13 6.4 Acknowledge 13 6.5 Transmission without acknowledge . 13 7 IC interface protocol . 15 7.1 Write mode transmission . 15 7.2 Read mode transmission . 16 7.3 Data registers 17 2/28 Doc ID 022876 Rev 1