ST7LNB0V2Y0 datasheet(8/30 Pages) STMICROELECTRONICS

Il numero della parte	ST7LNB0V2Y0

Spiegazioni elettronici	DiSEqC??2.1 slave microcontroller for LNBs and switchers

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ST7LNB0V2Y0 functional description

ST7LNB0V2Y0

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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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