LNBH23QTR STMicroelectronics

LNBH23 LNBs supply and control IC with step-up and IC interface Datasheet production data Features Complete interface between LNB and IC bus Built-in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93% 0.75 A), with integrated NMOS Selectable output current limit by external resistor Compliant with main satellite receiver systems PowerSSO-24 QFN32 (5 x 5 mm.) specifications (Exposed pad) (Exposed pad) New accurate built-in 22 kHz tone generator suits widely accepted standards (patent pending) Fast oscillator start-up facilitates DiSEqC Description encoding Intended for analog and digital satellite Built-in 22 kHz tone detector supports bi- receivers/sat-TV, sat-PC cards, the LNBH23 is a directional DiSEqC 2.0 monolithic voltage regulator and interface IC, Very low-drop post regulator and high assembled in PowerSSO-24 ePAD and QFN32 (5 efficiency step-up PWM with integrated power x 5 mm.) ePAD, specifically designed to provide NMOS allow low power losses the 13/18 V power supply and the 22 kHz tone signalling to the LNB down-converter in the Two output pins suitable to by-pass the output antenna dish or to the multi-switch box. In this R-L filter and avoid any tone distortion (R-L application field, it offers a complete solution with filter as per DiSEqC 2.0 specs, see typ. extremely low component count, low power application circuits) dissipation together with simple design and IC Overload and over-temperature internal standard interfacing. protections with IC diagnostic bits Output voltage and output current level diagnostic feedback by IC bits LNB short circuit dynamic protection 4 kV ESD tolerant on output power pins Table 1. Device summary Order code Package Packaging LNBH23PPR PowerSSO-24 (Exposed pad) Tape and reel LNBH23QTR QFN32 (Exposed pad) Tape and reel February 2013 Doc ID 13356 Rev 8 1/32 This is information on a product in full production. www.st.com 32Contents LNBH23 Contents 1 Block diagram 3 2 Application information 4 2.1 DiSEqC data encoding and decoding . 4 2.2 DiSEqC 2.0 implementation 4 2.3 DiSEqC 1.X implementation 4 2.4 Data encoding by external tone generator (EXTM) 5 2.5 IC interface 5 2.6 Output voltage selection . 5 2.7 Diagnostic and protection functions 6 2.8 Output voltage diagnostic - VMON . 6 2.9 22 kHz tone diagnostic - TMON . 6 2.10 Minimum output current diagnostic - IMON 6 2.11 Output current limit selection . 7 2.12 Over-current and short circuit protection and diagnostic 7 2.13 Thermal protection and diagnostic . 7 3 Pin configuration 8 4 Maximum ratings . 10 5 Application circuit 11 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 LNBH23 software description 16 7.1 Interface protocol . 16 7.2 System register (SR, 1 byte) 16 2/32 Doc ID 13356 Rev 8