Item specifics
Description
The STM8SPLNB1M6 is a DiSEqC-dedicated 8-bit microcontroller from STMicroelectronics, purpose-built for DiSEqC slave operation in SaTCR-based LNBs (Low Noise Blocks) and switchers. It provides a complete hardware and firmware solution for system designers implementing LNB device control according to the DiSEqC standard (Digital Satellite Equipment Control). Featuring a 16 MHz advanced STM8 core with Harvard architecture and 3-stage pipeline, it integrates 8 KB Flash, 1 KB RAM, and 640-byte true data EEPROM (endurance: 300k write/erase cycles — 3x the typical industry standard). On-chip peripherals include a 10-bit ADC (5 channels with analog watchdog), 8-bit basic timer, auto wakeup timer, window and independent watchdog timers, and two DiSEqC communication interfaces, four I2C interfaces, and four output pins for legacy matrix control. Packaged in SOIC-20 (7.5 mm width), it operates from 2.95 V to 5.5 V over -40 °C to 85 °C. Ideal for satellite receiver LNBs, multi-switchers, and satellite front-end equipment requiring DiSEqC slave control.
DiSEqC-Dedicated Design: Two built-in DiSEqC communication interfaces, complete hardware and firmware solution compliant with DiSEqC standard (Digital Satellite Equipment Control), optimized for SaTCR LNBs and switchers Advanced Core: 16 MHz STM8 core, Harvard architecture, 3-stage pipeline, extended instruction set Memory: 8 KB Flash, 1 KB RAM, 640-byte true data EEPROM (300k write/erase cycles) 10-bit ADC: 5 multiplexed channels, ±1 LSB accuracy, scan mode, analog watchdog, internal reference voltage measurement Communication Interfaces: 2x DiSEqC communication interfaces, 4x I2C interfaces (up to 400 Kbit/s) Control Outputs: 4 output pins for legacy matrix control Clock System: Internal user-trimmable 16 MHz RC oscillator, internal low-power 128 kHz RC oscillator, clock security system, low-consumption POR/PDR Low-Power Modes: Wait, Active-halt, Halt; individually switchable peripheral clocks High Reliability: Low-consumption POR/PDR, safe power on/off management by low voltage detector (LVD), highly robust I/O design SOIC-20 Package: 7.5 mm wide-body SOIC-20, surface mount Wide Operating Range: 2.95 V to 5.5 V, -40 °C to 85 °C Development Support: Embedded SWIM single-wire interface for fast on-chip programming and non-intrusive debugging
Satellite Receiver LNBs: DiSEqC slave control for single/dual/multi-LO LNBs, Ku-band/Ka-band satellite reception front-ends Multi-Switchers: DiSEqC multi-switch units, multi-satellite antenna signal switching management Satellite Front-End Equipment: Satellite signal splitters, repeaters, IF amplifiers, and other satellite reception link equipment CATV Head-End Systems: Cable TV front-end satellite signal reception and control Satellite Communication Terminals: VSAT terminals, satellite modem front-end control Set-Top Box Companion: Front-end LNB control and switching for set-top boxes
Integrated DiSEqC Solution: Built-in dual DiSEqC interfaces + four I2C interfaces eliminate external DiSEqC decoder ICs, significantly reducing LNB system BOM cost Complete Hardware & Firmware: STMicroelectronics provides complete DiSEqC slave firmware libraries and reference designs, greatly shortening development cycles 300k High-Endurance EEPROM: 640-byte true data EEPROM with 300k write/erase cycles (3x standard endurance), reliably storing satellite parameters and calibration data Dual DiSEqC Redundancy: Two DiSEqC interfaces support simultaneous dual-channel operation, enhancing system reliability and flexibility Wide Voltage Adaptability: 2.95 V to 5.5 V wide voltage range accommodates LNB supply voltage fluctuations Industrial Temperature Range: -40 °C to 85 °C, meeting all-weather outdoor satellite receiver equipment requirements Mature Ecosystem: STM8 classic architecture, rich documentation, low-cost SWIM debug, complete application notes
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FAQ:
What is the STM8SPLNB1M6 and what are its key specifications?
The STM8SPLNB1M6 is an 8‑bit microcontroller from STMicroelectronics, specifically designed for satellite low‑noise block downconverter (LNB) control and DiSEqC™ communication. It is built around the proven STM8 core running at up to 16 MHz, with 8 KB of Flash memory and 1 KB of SRAM (plus 128 bytes of EEPROM for parameter storage). The chip integrates a full DiSEqC 2.x modulator/demodulator, a 10‑bit ADC, multiple timers, and standard communication interfaces (UART, I2C, SPI). All functions are packed into a compact SO‑20 surface‑mount package. This dedicated MCU simplifies the design of satellite receiver front‑ends by combining precise LNB supply control, tone signalling, and robust DiSEqC command handling on a single chip.
What package does the STM8SPLNB1M6 use and how many I/O pins are available?
The device comes in a SO‑20 package with a body width of 7.5 mm and a lead pitch of 1.27 mm. It provides up to 16 general‑purpose I/O pins, which are enough to handle LNB control signals, an I2C interface for a demodulator, and a few extra status or control lines. The SO‑20 package is easy to hand‑solder and well‑suited for single‑board satellite receiver designs where space is limited but manual assembly or simple reflow is preferred.
How does the STM8SPLNB1M6 differ from a general‑purpose STM8S microcontroller?
While general‑purpose STM8S devices require software bit‑banging or external hardware to generate DiSEqC signals and manage 22 kHz tone signalling, the STM8SPLNB1M6 includes dedicated hardware. The on‑chip DiSEqC modulator handles precise timing and framing for DiSEqC 1.x and 2.x protocols, and the integrated tone generator can produce the 22 kHz control tone with very stable frequency and minimal software overhead. This hardware integration reduces CPU load, improves timing accuracy, and eliminates the need for external components, making it a true single‑chip LNB controller. Additionally, the MCU often includes specific hardware for detecting the supply current/voltage of the LNB, further simplifying the design.
How does the built‑in DiSEqC™ modulator work, and what versions does it support?
The integrated DiSEqC 2.x hardware modulator generates the precise pulse‑width‑modulated signals required by the DiSEqC bus — specifically the 22 kHz ±20 % carrier with defined pulse widths for ‘0’ and ‘1’ bits. It can be configured through simple register writes to send commands, and the modulator automatically handles the timing and framing. The demodulator section can also receive reply signals from a DiSEqC‑compatible LNB (DiSEqC 2.x bidirectional mode). This hardware block supports the most common DiSEqC standards used in consumer satellite receivers, such as DiSEqC 1.0 and DiSEqC 2.0/2.1, allowing reliable control of multi‑satellite dishes and switches.
What LNB power‑supply and control features does the STM8SPLNB1M6 offer?
The chip is designed to work closely with an external LNB power supply (e.g., a boost converter controlled by a PWM output from the MCU). It can monitor the LNB supply voltage and current using its internal 10‑bit ADC, and it can generate the 22 kHz tone for band switching directly via a dedicated timer output. With proper external circuitry (typically a transistor or load switch), the MCU can also implement short‑circuit protection and overcurrent shutdown through its fast interrupt and comparator capabilities. The hardware tone generator guarantees a clean, frequency‑stable signal that meets the tight requirements of satellite receivers.
Is 8 KB of Flash and 1 KB of RAM enough for a complete LNB controller application?
Absolutely. The typical LNB control firmware is compact — it consists of a DiSEqC command interpreter, an ADC sampling routine for voltage/current monitoring, and a simple state machine to handle tone and voltage switching. With 8 KB of Flash, there is plenty of room for a robust application, multiple DiSEqC command sets, and even a small bootloader. The 1 KB of SRAM comfortably handles the stack, global variables, and communication buffers. The additional 128 bytes of EEPROM are ideal for storing calibration data, satellite positions, or user settings without wearing out the Flash. Overall, this memory configuration is well‑matched to the requirements of a dedicated LNB controller.
What are the ADC specifications of the STM8SPLNB1M6? How many analog channels are available?
The integrated 10‑bit successive‑approximation ADC provides enough resolution to accurately monitor LNB supply voltage and current. In the SO‑20 package, typically 4 to 6 external analog input channels are available, depending on how many pins are shared with the DiSEqC and communication functions. The ADC can also be used to read an internal temperature sensor or the supply voltage. This precision is sufficient to detect overcurrent faults, compensate for cable voltage drop, or fine‑tune the LNB power supply.
What supply voltage does the STM8SPLNB1M6 require, and is it a 5 V device?
The MCU operates from a 2.95 V to 5.5 V supply, making it a true 5 V‑tolerant device that can be powered directly from the common 3.3 V or 5 V rails found in satellite receiver boards. Most I/O pins can safely interface with 5 V logic, simplifying the connection to legacy tuner or demodulator chips. The wide supply range also allows the chip to be powered from a low‑cost linear regulator or even from the LNB supply line itself, provided suitable decoupling is used.
How do I program and debug the STM8SPLNB1M6? What development tools are needed?
Programming and debugging use the SWIM (Single Wire Interface Module) interface, which requires only a single pin plus reset and ground. STMicroelectronics offers the low‑cost ST‑LINK/V2 (with SWIM support) as a debugger and programmer. The free STVD (ST Visual Develop) IDE with the Cosmic C compiler (or the free SDCC open‑source compiler) can be used to develop firmware. The STM8CubeMX tool is not available for STM8 devices; configuration is typically done through the standard peripheral libraries provided by ST. Many example projects for LNB control are available, helping you quickly get a working prototype.
What are the most typical applications for the STM8SPLNB1M6?
This microcontroller is purpose‑built for satellite receiver front‑ends and LNB control circuits. Its typical uses include: single‑cable distribution (SCD) switches, multi‑satellite DiSEqC control boxes, integrated digital satellite receivers (set‑top boxes), PC TV tuner cards with satellite input, and standalone LNB power injectors. In each case, the STM8SPLNB1M6 serves as the intelligent core that manages DiSEqC commands, 22 kHz tone signalling, and LNB power monitoring, replacing discrete analog circuits with a flexible, software‑driven solution.