STM8SPLNB1 datasheet(10/44 Pages) STMICROELECTRONICS

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STM8SPLNB1 operation

STM8SPLNB1

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DocID018831 Rev 5

Another option is to decrease number of I2C channels and use the remaining pins for legacy

matrix LNB control - e.g. to have 2 I2C channels (4 pins) and 4 legacy matrix output pins -

see Table 16: Application types.

Operation mode and device behavior depends from final hardware configuration. This

behavior is selected through configuration parameters - see Table 14: STM8SPLNB1

EEPROM parameters.

Note:

Advantage of using incremental order mode is in applications with up to 4 SaTCRs - which

is common in practice. Then each SaTCR owns one I2C bus. I2C communication with

another SaTCRs is running on different I2C bus - so it does not disturb HF signal on given

SaTCR (SaTCR is sensitive to I2C bus signal transients).

Advantage of using ST7LNB1 compatible mode is in applications where is used SaTCRs

control together with legacy matrix outputs (MAT1-MAT4) - see Section 1.1.1: Pins

description. In this case there remains free only 2 I2C buses for SaTCRs control (MAT1-

MAT4 pins occupy I2C3 and I2C4 bus). In ST7LNB1 compatible mode 2 I2C buses can

address up to 4 SaTCRs - 2 SaTCRs per I2C bus. Disadvantage is the I2C bus disturbance

to SaTCR which is not addressed - shared I2C bus (HF filters on I2C buses is

recommended).

2.1

Supported DiSEqC commands

In the following Table 4: STM8SPLNB1 DiSEqC™ supported commands are listed DiSEqC

commands supported by STM8SPLNB1. For more details about commands, refer to the

DiSEqC™ slave microcontroller specifications at www.eutelsat.com.

1. Selection of incremental order mode: pin MODE (see Table 1: STM8SPLNB1 pins description) is left open

or I2C addressing mode EEPROM parameter (see Table 14: STM8SPLNB1 EEPROM parameters) is set

to 1.

Table 4. STM8SPLNB1 DiSEqC™ supported commands

command

number

command

name

function

0x00

RESET

Reset DiSEqC™ microcontroller

0x0D

config read

Read configuration parameters from EEPROM

0x0F

config write

Write configuration parameters to EEPROM

0x38

write to port

DiSEqC 1.0: Write to port group command - Legacy commands

0x5A

operation

command

DiSEqC-ST normal operation commands:

ODU_Changechannel or ODU_SatCROFF

0x5B

installation

command

DiSEqC-ST installation commands:

ODU_Config, ODU_EEPvar.LOFREQ or ODU_SatCRxON

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