ISM RX 2 Click Board™

Product Code: MIKROE-4230

How Does The ISM RX 2 Click Board™ Work? The ISM RX 2 Click Board™ is based on the Si4356, an easy-to-use, size-efficient, low-current wireless receiver IC from Silicon Labs that covers the sub-GHz bands. The wide operating voltage range and low current consumption make the Si4356 an ideal solution for battery-powered applications. It has an integrated crystal oscillator and uses a single-conversion mixer to downconvert the (G)FSK, or OOK modulated receive signal to a low IF frequency. The receiver demodulates the incoming data asynchronously by oversampling the incoming transmission, and the resulting demodulated signal send to the system MCU via the UART interface. The Si4356 has a frequency range from 315 up to 917MHz and can be configured for operation using the four selector pins (SEL0 – SEL3) where the state of each of these pins is read internally at Start-Up and used to determine which pre-loaded configuration should be used. The SEL0 and SEL1 pins are used to adjust the frequency, and they are connected in such a way that the frequency of this Click board™ is fixed to 434.15MHz, while the setting of the SEL2 and SEL3 pins can be changed by using the SMD jumpers labelled as MODE SEL used to select the desired modulation (G)FSK or OOK.

Additionally, this Click board™ has a low-pass RC filter on the receiver data output pin, which filters the output and improves sensitivity. This Click board™ communicates with MCU using the UART interface for the data transfer, while the GPIO pins on the mikroBUS™ are used for mode selection and indication. More precisely, only one UART pin from the mikroBUS™ (RX) is used for receiving the data. The Si4356 provides two operating modes: a Receive Mode and a Stand-by Mode. The operating mode can be changed by toggling the STBY signal routed to the CS pin on the mikroBUS™, while the MSTAT signal routed to the INT pin on the mikroBUS™ represents an interrupt and indicates the current operating mode of the device. It is also possible to reset the device by using RST pin routed to the RST pin on the mikroBUS™. ISM RX 2 Click possesses the SMA antenna connector with an impedance of 50Ω and can be used for connecting the appropriate antenna that MikroE has in its offer such as Rubber Antenna 433MHz Straight, for improved range and received signal strength. This Click board™ is designed to be operated only with a 3.3V logic voltage level. A proper logic voltage level conversion should be performed before the Click board™ is used with MCUs with different logic levels. SPECIFICATIONS Type Sub-1 GHz Transceivers Applications Can be used for remote low-speed communication, such as remote keyless access, garage or gate doors control, industrial control, home automation, and similar applications where this kind of communication is applicable. On-board modules ISM RX 2 Click is based on the Si4356, an easy-to-use, size-efficient, low-current wireless receiver IC from Silicon Labs. Key Features Low current consumption, (G)FSK/OOK demodulator, pin configurable, excellent sensitivity up to –113 dBm, automatic gain control, true plug-and-play receive the option and more. Interface GPIO, UART Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V PINOUT DIAGRAM This table shows how the pinout of the ISM RX 2 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 NC Reset RST 2 RST INT 15 MST Operating Mode Indicator Operating Mode Selector STB 3 CS RX 14 TX UART TX NC 4 SCK TX 13 NC NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 NC Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS