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Home > Products > Integrated Circuits (ICs) > Embedded > Application Specific Microcontrollers

STMicroelectronics STM8SPLNB1M6

Name: STM8SPLNB1M6
Brand: STMicroelectronics
SKU: STM8SPLNB1M6
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8SPLNB1M6

Manufacturer:: STMicroelectronics

Category:: Application Specific Microcontrollers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: STM8SPLNB1M6.pdf

Description:: IC MCU 8BIT DISEQC 20SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM8SPLNB1M6 from STMicroelectronics is an 8-bit DiSEqC™ slave microcontroller designed for satellite low-noise block (LNB) and switcher control in SaTCR-based architectures. It integrates dual DiSEqC interfaces, four I²C master channels (supporting up to eight SaTCR devices), four legacy matrix output pins, internal 16 MHz oscillator, and operates from 2.95–5.5 V with LVD-based safe power sequencing. Used in multi-band satellite receiver front-ends requiring precise RF path selection and configuration.

For engineers reviewing the STM8SPLNB1M6 datasheet, STM8SPLNB1M6 pinout, STM8SPLNB1M6 application, or STM8SPLNB1M6 equivalent, this page delivers verified technical context, validated pin functions, real-world satellite LNB control use cases, and confirmed alternative parts for DiSEqC slave migration paths - all grounded in ST's production data (DocID018831 Rev 5).

Technical Context

The STM8SPLNB1M6 implements a dedicated DiSEqC™ slave protocol stack with hardware-level support for DiSEqC 1.0 and DiSEqC-ST command sets (0x00, 0x0D, 0x0F, 0x38, 0x5A, 0x5B), including voltage-triggered command detection after 13→18 V transition and 4–24 ms delay window. Its firmware handles EEPROM-stored configuration parameters (e.g., I²C addressing mode, SaTCR mapping) and supports both ST7LNB1-compatible and incremental-order SaTCR assignment modes.

It provides two independent DiSEqC receive inputs (DRX1/DRX2) with priority handling, one DiSEqC transmit output (DTX) with 22 kHz modulation, and configurable I²C master outputs (SCL1–SCL4, SDA1–SDA4) capable of driving two LNBs per channel at addresses 0xC8/0xCA. Legacy matrix control uses MAT1–MAT4 pins, assignable via EEPROM configuration to coexist with I²C operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	8-bit STM8 CPU with 16 MHz internal oscillator - eliminates external crystal, reduces BOM cost and board space in LNB modules.
DiSEqC Interfaces	2 receive (DRX1/DRX2), 1 transmit (DTX) - enables primary/secondary coaxial command reception and bidirectional DiSEqC-ST communication.
I²C Master Channels	4 independent channels (SCL/SDA pairs) - supports up to 8 SaTCR devices across standard/wide RF bands without bus contention.
Legacy Matrix Outputs	4 dedicated pins (MAT1–MAT4) - directly drives analog RF switches in legacy LNB designs, configurable alongside I²C mode.
Supply Voltage Range	2.95–5.5 V with integrated LVD - ensures reliable reset and brown-out protection during unstable LNB power delivery (e.g., 5 V ±10% over coax).
EEPROM Configuration	Non-volatile parameter storage (e.g., I²C addressing mode, SaTCR mapping) - enables field-updatable behavior without firmware reflash.
Operating Temperature	−40°C to +85°C - qualified for outdoor LNB environments exposed to thermal cycling and wide ambient ranges.

Pinout & Package

STM8SPLNB1M6 is available in TSSOP20 (4.40 mm body), SO20W (300 mils), and UFQFPN20 (3 × 3 mm) packages. All variants share identical pin functionality and electrical characteristics.

Pin/Terminal	Circuit Role	Design Meaning
VDD (Pin 9 / TSSOP/SO; Pin 6 / UFQFPN)	Power supply input	+5 V ±10% main supply - must be stabilized before RESET release; powers all digital and I²C circuitry.
VSS (Pin 7 / TSSOP/SO; Pin 4 / UFQFPN)	Ground reference	Common return for all analog/digital domains - requires low-impedance PCB connection to minimize noise coupling into DiSEqC receivers.
RESET (Pin 4 / TSSOP/SO; Pin 1 / UFQFPN)	Active-low reset input	Asynchronous reset triggered by external pull-down or LVD; requires 0.1 µF capacitor to VSS for noise immunity.
VCAP (Pin 8 / TSSOP/SO; Pin 5 / UFQFPN)	Internal regulator bypass	Connects 1 µF capacitor to VSS - stabilizes internal voltage regulator for core logic, critical for DiSEqC timing accuracy.
DRX1 (Pin 3 / TSSOP/SO; Pin 20 / UFQFPN)	Primary DiSEqC receive input	Accepts filtered HF DiSEqC signal from coax - highest-priority command channel; used for all standard DiSEqC 1.0 and DiSEqC-ST commands.
DRX2 (Pin 2 / TSSOP/SO; Pin 19 / UFQFPN)	Secondary DiSEqC receive input	Redundant or auxiliary DiSEqC input - lower priority; used only if DRX1 fails or in dual-LNB configurations with separate command paths.
DTX (Pin 1 / TSSOP/SO; Pin 18 / UFQFPN)	DiSEqC transmit output	22 kHz modulated answer signal - requires AC coupling to coaxial line; enables master confirmation and installation feedback (e.g., ODU_Config response).
SCL1–SCL4 / SDA1–SDA4 (Pins 11–20 / TSSOP/SO; Pins 8–17 / UFQFPN)	I²C master clock/data outputs	Four independent open-drain I²C buses - each drives two SaTCR devices at fixed addresses (0xC8/0xCA); supports hot-plug-safe timing per DiSEqC-ST spec.
MAT1–MAT4 (Pins 5–6, 12–13 / TSSOP/SO; Pins 2–3, 9–10 / UFQFPN)	Legacy matrix control outputs	CMOS-level digital outputs - directly control RF switches in non-I²C LNBs; enabled/disabled via EEPROM configuration to avoid conflict with I²C pins.
MODE (Pin 5 / TSSOP/SO; Pin 2 / UFQFPN)	I²C addressing mode select	Pull-down = ST7LNB1-compatible mode (2 buses × 2 SaTCRs); open = incremental order mode (4 buses × 2 SaTCRs) - determines SaTCR-to-bus mapping.

Key Features

Feature	Design Value
DiSEqC-ST Protocol Compliance	Fully implements Eutelsat DiSEqC-ST commands (0x5A/0x5B) for SaTCR channel switching, configuration, and LO frequency setup - eliminates need for external protocol translation logic.
Dual DiSEqC Receive Path	Hardware-supported DRX1/DRX2 prioritization - enables failover and multi-source command reception without software overhead or timing jitter.
Configurable I²C/Legacy Coexistence	EEPROM-selectable operation mode - allows same silicon to drive either 4 I²C SaTCRs + 0 legacy pins, or 2 I²C SaTCRs + 4 MAT pins, optimizing for application-specific RF architecture.
On-Chip Power Management	Integrated low-voltage detector (LVD) with programmable threshold - ensures deterministic reset during coaxial power ramp-up/down, preventing spurious DiSEqC command execution.
Field-Programmable Configuration	DiSEqC-accessible EEPROM (0x0D/0x0F commands) - permits vendor-specific locking, post-manufacture tuning of SaTCR mapping, and remote firmware-less updates.

Applications

Multi-Band Satellite LNB Control

SaTCR-Based Switcher Modules

Use Scenario: Controlling 4–8 band-pass filters (SaTCRs) in wideband satellite LNBs to select between C/Ku/Ka bands and polarization states.

IC Role / Device Role / Timing Role: DiSEqC™ slave microcontroller executing ODU_Changechannel (0x5A) and ODU_SatCRxON (0x5B) commands; manages I²C timing to avoid HF interference on active SaTCR paths.

Use Value: Enables single-cable multi-switch (SCMS) compatibility and seamless band/polarization switching with <50 ms latency, meeting Eutelsat DiSEqC-ST timing requirements.

Use Scenario: Managing RF signal routing in DiSEqC-controlled switchers connecting multiple LNBs to a single receiver.

IC Role / Device Role / Timing Role: Dual-receive DiSEqC slave interpreting master commands (0x0F, 0x38) and driving legacy matrix outputs (MAT1–MAT4) or I²C-addressed switch ICs.

Use Value: Supports hybrid topologies - e.g., 2 I²C-controlled LNBs + 4 analog-switched feeds - without external glue logic or additional microcontrollers.

ST7LNB1 Migration Platforms

Field-Configurable Satellite Receivers

Use Scenario: Drop-in replacement for legacy ST7LNB1 in existing LNB designs requiring extended SaTCR count or enhanced DiSEqC-ST support.

IC Role / Device Role / Timing Role: Pin-compatible DiSEqC slave operating in ST7LNB1-compatible mode (MODE = GND); replicates original timing and register map while adding EEPROM configurability.

Use Value: Reduces redesign effort - retains existing PCB layout and firmware interface while enabling new features like remote configuration lock and SaTCR diagnostics.

Use Scenario: Enabling OEMs to ship universal LNB hardware configured per regional satellite standards (e.g., Eutelsat vs. SES) via DiSEqC-based provisioning.

IC Role / Device Role / Timing Role: Field-programmable DiSEqC slave using 0x0F/0x0D commands to write EEPROM parameters (I²C mode, LO frequencies, SaTCR count) during installation.

Use Value: Eliminates variant SKUs and inventory complexity - one BOM supports global deployments with region-specific behavior defined in-field.

Equivalent & Alternatives

The following parts are listed as comparable options for similar DiSEqC slave applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ST7LNB1M6	Lacks DiSEqC-ST command support (0x5A/0x5B), no EEPROM configuration, fixed I²C addressing, no DRX2 input.	Supports only DiSEqC 1.0 and basic SaTCR control; limited to ≤4 SaTCRs in ST7-compatible mode.	Select when migrating legacy designs with unchanged firmware and no DiSEqC-ST requirement.
STM8SPLNB2M6	Enhanced version with extended EEPROM size, improved ESD rating (±8 kV HBM), and updated DiSEqC-ST subcommand support (e.g., ODU_EEPvar.LOFREQ).	Required for new designs targeting Eutelsat's latest SaTCR specification revisions and higher reliability in harsh RF environments.	Select for new designs requiring future-proof DiSEqC-ST compliance and robustness against electrostatic discharge in field installations.

Compared with ST7LNB1M6, STM8SPLNB1M6 adds field-configurable SaTCR mapping and DiSEqC-ST support without changing pinout or power requirements; compared with STM8SPLNB2M6, it offers proven maturity and cost advantage where extended EEPROM or higher ESD is not required.

Availability

STM8SPLNB1M6 is available at Aetrix Electronics and suitable for satellite LNB manufacturing, DiSEqC switcher production, and broadcast equipment repair requiring stable component supply across TSSOP20, SO20W, and UFQFPN20 package variants.

Supply support for STM8SPLNB1M6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in automotive, industrial, and consumer ICs, with deep expertise in satellite communication and power-efficient microcontrollers.

The STM8SPLNB1 product line targets satellite frontend control - specifically DiSEqC™ slave implementation in LNBs and switchers - delivering integrated hardware/firmware solutions that reduce system-level design effort and accelerate time-to-market for broadcast equipment.

FAQ

What DiSEqC command sets does STM8SPLNB1M6 support?

STM8SPLNB1M6 supports DiSEqC 1.0 (commands 0x00, 0x0D, 0x0F, 0x38) and DiSEqC-ST (0x5A, 0x5B) as defined in Eutelsat specifications. It implements full command parsing, parameter validation, and answer generation per DocID018831 Rev 5, including ODU_Changechannel, ODU_Config, and ODU_SatCRxON subcommands.

How does the MODE pin affect I²C addressing behavior?

When MODE is pulled low, STM8SPLNB1M6 enters ST7LNB1-compatible mode: I²C1/I²C2 handle SaTCR1–SaTCR4 (two per bus). When MODE is open, it uses incremental order mode: I²C1–I²C4 each serve one SaTCR (SaTCR1–SaTCR4), with SaTCR5–SaTCR8 mapped cyclically. This setting is also mirrored in EEPROM address 0x00.

Can STM8SPLNB1M6 drive both I²C SaTCRs and legacy matrix outputs simultaneously?

No - I²C and legacy matrix functions share physical pins (e.g., SCL3/SDA3 = MAT1/MAT2). The device operates in one mode only, selected via EEPROM configuration parameter "MatrixEnable" (address 0x03). Enabling legacy outputs disables the corresponding I²C channels to prevent bus contention and signal corruption.

What is the purpose of the VCAP pin and its required capacitor value?

VCAP supplies the internal voltage regulator for the STM8 core. A 1 µF ceramic capacitor must be placed between VCAP and VSS, as specified in Section 4.3.2 of DocID018831 Rev 5. This capacitor stabilizes the regulated core voltage, ensuring accurate DiSEqC timing and preventing reset glitches during transient load conditions.

STM8SPLNB1M6 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STM8S

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Active

Programmable:: Not Verified

Applications:: SaTCR LNBs and Switchers

Core Processor:: STM8

Program Memory Type:: -

Controller Series:: -

RAM Size:: -

Interface:: DiSEqC, I2C

Number of I/O:: -

Voltage - Supply:: 2.95V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

STM8SPLNB1M6 FAQ

1.How can I place an order for STM8SPLNB1M6 through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8SPLNB1M6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STM8SPLNB1M6 reliable?

The price and inventory of STM8SPLNB1M6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8SPLNB1M6 is usually 5 days.

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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8SPLNB1M6 transactions.

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4.How is shipping managed for STM8SPLNB1M6?

STM8SPLNB1M6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8SPLNB1M6 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STM8SPLNB1M6?

For technical support, including STM8SPLNB1M6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8SPLNB1M6 requirements.

6.How does Aetrix verify that STM8SPLNB1M6 is sourced from the original manufacturer or authorized distributors?

All STM8SPLNB1M6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM8SPLNB1M6 meets industry standards.

7.What is the process for return or replacement of STM8SPLNB1M6?

All STM8SPLNB1M6 units undergo pre-shipment inspection (PSI). If there is an issue with STM8SPLNB1M6, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STM8SPLNB1M6 part is unused and in its original packaging.

Return procedure for STM8SPLNB1M6:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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