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ST7LNB0V2Y0 Scheda tecnica(PDF) 8 Page - STMicroelectronics |
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ST7LNB0V2Y0 Scheda tecnica(HTML) 8 Page - STMicroelectronics |
8 / 30 page ST7LNB0V2Y0 functional description ST7LNB0V2Y0 8/30 3 ST7LNB0V2Y0 functional description 3.1 ST7LNB0V2Y0 configuration Unlike the original slave microcontroller described in the Eutelsat DiSEqC slave microcontroller specifications version 1.0, the ST7LNB0V2Y0 does not scan the control pins in order to determine the slave configuration. Instead all configuration parameters must be programmed for each specific application, and an option list (see Section 8: Device configuration) must be filled-in to program the necessary options at the manufacturing stage. The slave configuration parameters are the following: ● The DiSEqC™ slave address: 11h for an LNB, and 15h for a switcher ● The local oscillator frequency table entry numbers ● The DiSEqC™ configuration byte (refer to page 15 of DiSEqC slave microcontroller specifications) ● 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 ST7LNB0V2Y0 switching output modes The ST7LNB0V2Y0 has 8 pins, OP1 to OP 8 available to provide ‘TTL’ logic levels to operate switches. The switches can be are used to select various signal conditions and sources (for example horizontal polarization, or 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 operated differently. Three possible output modes can be configured: 3.2.1 Single polarity output mode In this mode each pin can be controlled individually as described in Table 3: Table 3. Single polarity output mode Function name Function description OP4 SO B/A OP3 SB/SA OP2 Hor/Ver OP1 Hi/Lo OP5 SW5 OP6 SW6 OP7 SW7 OP8 SW8 |
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