LNBH221 Dual LNB supply and control IC with step-up converter and IC interface Features All the features are the same for both section Complete and independent interface between LNBS and relevant IC bus Built-in DC-DC controller for single 12 V supply operation and high efficiency (typ. 93 % 500 mA) LNB output current guaranteed up to 500 mA Both compliant with EUTELSAT and direct PowerSO-36 output voltage specification accurate built-in 22 kHz tone oscillator suits widely accepted standards Fast oscillator start-up facilitates DiSEqC encoding Built-in 22 kHz tone detector supports bi- assembled in PowerSO-36, specifically designed directional DiSEqC 2.0 to provide the power 13/18 V, and the 22 kHz tone Semi low-drop post regulator and high signalling for two independent LNB down efficiency step-up PWM for low power loss: converters or to a multiswitch box that could be Typ. 0.56 W 125 mA independently powered and set. In this Two output pins suitable to by-pass the output application field, it offers a complete solution with R-L filter and avoid any tone distortion (R-L extremely low component count, low power filter as per DiSEqC 2.0 specs, see Figure 4 on dissipation together with simple design and IC page 8) standard interfacing. Overload and over-temperature internal protections Overload and over-temperature IC diagnostic bits LNB short circuit SOA protection with IC diagnostic bit +/- 4 kV ESD tolerant on input/output power pins Description Intended for analog and digital dual satellite STB receivers/sat-TV, sets/PC cards, the LNBH221 is a voltage regulator and interface IC, April 2009 Doc ID 9913 Rev 6 1/27 www.st.com 27 Obsolete Product(s) - Obsolete Product(s) Contents LNBH221 Contents 1 Diagram . 3 2 Maximum ratings 4 3 Pin configuration . 5 4 Typical application circuits for each section: A and B . 7 5 Application information 9 5.1 IC bus interface (one for each section) 10 5.2 Data validity . 10 5.3 Start and stop conditions . 10 5.4 Byte format 11 5.5 Acknowledge 11 5.6 Transmission without acknowledgement . 11 6 LNBH221 software description (same for both section) . 13 6.1 Interface protocol . 13 6.2 System register (SR, 1 byte) 13 6.3 Transmitted data (IC bus write mode) . 13 6.4 Received data (IC bus read mode) . 14 6.5 Power-on IC interface reset . 15 6.6 Address pin . 15 6.7 DiSEqC implementation 15 7 Electrical characteristics 16 8 Thermal design notes . 18 9 Typical performance characteristics (of each section) 19 10 Package mechanical data 23 11 Revision history . 26 2/27 Doc ID 9913 Rev 6 Obsolete Product(s) - Obsolete Product(s)