Mikroelektronika d.o.o.
HF-Schalter-Click-Platine
HF-Schalter-Click-Platine
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Das RF Switch Click Board™ ist mit dem MASWSS0115 ausgestattet, einem von Macom entwickelten GaAs PHEMT MMIC-Einpol-Umschalter (SPDT) zum Umschalten zwischen Kleinsignalkomponenten wie Filterbänken, Einband-LNAs, Konvertern usw. Der MASWSS0115 eignet sich ideal für Anwendungen, bei denen eine sehr kleine Größe und niedrige Kosten erforderlich sind.
Das RF Switch Click Board™ kann für Anforderungen an geringen Stromverbrauch und geringe Verluste in allen Systemen mit bis zu 3 GHz verwendet werden, einschließlich PCS, GSM, DCS, Bluetooth und anderen Empfangskettenanwendungen. Die Click Board™-Platine enthält zusätzliche Treiber in Form eines ergänzenden Steuer- und Netzschalters für sichere Schaltvorgänge. Das RF Switch Click Board™ ermöglicht einfaches Signalschalten mit einem Einfügungsverlust von 0,3 dB bei 2,4 GHz und einem maximalen Stromverbrauch von 20 µA.
How Does The RF Switch Click Board™Work?
The RF Switch Click Board™ features MASWSS0115, a GaAs PHEMT MMIC single-pole, double-throw (SPDT) switch in a low cost, lead-free SC-70 (SOT-363) surface mount plastic package. The MASWSS0115 is ideally suited for applications where a very small size and low cost are required. Typical applications are dual-band systems that require switching between small signal components such as filter banks, single-band LNAs, converters, etc. This part can be used for low power, low loss requirements in all systems operating up to 3 GHz, including PCS, GSM, DCS, Bluetooth, and other receive chain applications. The MASWSS0115 is fabricated using a 0.5 micron gate length GaAs PHEMT process. The process features full passivation for performance and reliability.
Featured chip MASWSS0115 provides signal switching of 50MHz to up to 3GHz with an insertion loss of 0.3 dB at 2.4 GHz and power consumption of 5 µA at +2.3V. Ultra High-Speed CMOS inverter labelled as NC7WZ14 is used for driving and controlling an RF switch with the typical switching time of 3,2 ns. Additionally, a load switch TPS22943DCKR can enable or disable the RF switch by electrically detaching the power supply. RF Switch Click Board™ uses the 5V to supply the switch driver while 3.3V microcontroller can be used to communicate with the control circuitry.
Two LEDs (RF1 and RF2) indicate the current active RF port as a visual representation of a state of the switch. Since RF1 is complementary to RF2, the switching can be achieved with only one GPIO pin. The RFC is an input of the switch with the possibility of redirecting the RF signal to RF1 or RF2 port. Besides switching SEL pin, the pin labelled as ON is used for power control. All of the switch ports are accessible on the connectors located on top of the Click Board™ with the addition of miniature coaxial connectors for both RF ports.
SPECIFICATIONS
| Type | Port expander |
| Applications | Typical applications include the systems where an RF signal has multiple possible paths like cellular infrastructure, wireless devices, automotive telematics, mobile radio, test equipment. |
| On-board modules | The RF Switch Click Board™ uses the MASWSS0115 IC, a GaAs PHEMT MMIC single-pole, double-throw (SPDT) switch , from Macom. |
| Key Features | GaAs single pole, double throw (SPDT) switch in a low cost and very small size package |
| Interface | GPIO |
| Compatibility | mikroBUS |
| Click board size | M (42.9 x 25.4 mm) |
| Input Voltage | 5V |
PINOUT DIAGRAM
This table shows how the pinout of the RF Switch Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | SEL | Port Select | |
| NC | 2 | RST | INT | 15 | NC | ||
| Power On | ON | 3 | CS | RX | 14 | NC | |
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | NC | ||
| NC | 6 | MOSI | SDA | 11 | NC | ||
| NC | 7 | 3.3V | 5V | 10 | 5V | Power Supply | |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| LD2 | RF1 | - | RF Channel Indicator 1 |
| LD3 | RF2 | - | RF Channel Indicator 2 |
Software Support
We provide a library for the RF Switch Click Board™ on our LibStock page, as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
Library Description
The library covers all the necessary functions to control the RF Switch Click Board™. The library contains a function which switching signal between RF Channel 1 and 2.
Key Functions
void rfswitch_set_mode ( uint8_t enable )- Set Power mode state.void rfswitch_sel_state ( uint8_t sel_state )- Set SEL pin state.void rfswitch_select_channel ( uint8_t select_channel )- Select RF channel.
Example Description
The application is composed of three sections :
- System Initialization - Initializes GPIO and LOG structures, sets CS and PWM pins as output and start write log.
- Application Initialization - Initialization driver enable's - GPIO, also write log.
- Application Task - (code snippet) This is a example which demonstrates the use of the RF Switch Click Board™. Results are being sent to the USART Terminal where you can track their changes.
void application_task ( )
{
mikrobus_logWrite( " Switch to RF Port 1 ", _LOG_LINE );
mikrobus_logWrite( "-----------------------", _LOG_LINE );
rfswitch_select_channel( RFSWITCH_SELECT_CHANNEL_1 );
Delay_ms( 5000 );
mikrobus_logWrite( " Switch to RF Port 2 ", _LOG_LINE );
mikrobus_logWrite( "-----------------------", _LOG_LINE );
rfswitch_select_channel( RFSWITCH_SELECT_CHANNEL_2 );
Delay_ms( 5000 );
}
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
- UART
Additional Notes and Information
Depending on the development board you are using, you may need USB UART Click Board™, USB UART 2 Click Board™ or RS232 Click Board™ to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.
MIKROSDK
The RF Switch Click Board™ is supported with mikroSDK - MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
HF-Schalter-Click-Platine
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