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ST7LNB0 Datasheet(PDF) 4 Page - STMicroelectronics |
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ST7LNB0 Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 22 page  ST7LNB0 4/22 3 ST7LNB0 FUNCTIONAL DESCRIPTION 3.1 ST7LNB0 Configuration Unlike the original slave microcontroller described in the “Eutelsat DiSEqC slave microcontroller ver- sion 1.0” the ST7LNB0 does not scan the control pins in order to determine the slave configuration, instead all configuration parameters must be pro- grammed for each specific application, an Option List (Section 8) must be filled-in in order to pro- gram the necessary options at the manufacturing stage. The slave configuration parameters are the follow- ing: – The DiSEqC™ slave address e.g.: 11h for an LNB, 15h for a switcher. – The Local oscillator frequency table entry numbers. – The DiSEqC™ configuration byte (refer to DiSEqC slave microcontroller document page 15) – The output mode (see next paragraph) – 22 kHz tone use in backwards compatible mode (SB/SA or Hi/Lo switching) – Standby pin use. 3.2 ST7LNB0 Switching Output Modes The ST7LNB0 has 8 pins (OP1 to OP 8) available to provide ‘TTL’ logic levels to operate switches to select various signal conditions and sources (e.g. horizontal polarization, satellite position). As listed in Table 2 the committed output port is composed of OP1 to OP4 and the uncommitted output port is composed of OP5 to OP8. Depending on the application hardware, the switching control pins OP1 to OP8 may be operat- ed differently. Three possible output modes can be configured: Single polarity output mode. In this mode each pin can be controlled individually as described in the following table: Table 3. Single polarity output mode Decoded output mode. This mode offers the pos- sibility to demultiplex three adjacent committed or uncommitted control lines (e.g Hi/Lo, SB/SA and SOB/A) in order to have a 1 of 8 demux on the out- put port OP1 to OP8. (for more details refer to DiS- EqC™ slave microcontroller specification docu- ment page 10). It is also possible to have a 1 of 4 demux by decod- ing only 2 control lines e.g. SB/SA and SO B/A for controlling a 1 of 4 switcher for example. Complementary output mode. In this mode the state of the uncommitted switching outport pins is the complementary of the state of the committed output ports pins (for more details refer to DiSE- qC™ slave microcontroller document page 14). Pin Number Function Name Function Description 9 OP4 SO B/A 10 OP3 SB/SA 11 OP2 Hor/Ver 12 OP1 Hi/Lo 5 OP5 SW5 6 OP6 SW6 7 OP7 SW7 8 OP8 SW8 |
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