Skywire Click

How does it work?

Skywire Click is based on double-row headers that allow stacking one of Airgain’s modem family, covering everything from 2G and 3G to LTE. The NimbeLink/Skywire includes a dozen modems with the same compact footprint and pinout. This fact simplifies the design of the applications, in addition to a MIKROE Click board™ boards and development boards portfolio. The combination can result in endless numbers of possibilities.

The Skywire Click is equipped with the MCP1826, a low-voltage, low-quiescent current LDO regulator from Microchip. This LDO provides the needed voltage for the modems. The selected logic level is connected to the external system IO reference input of the NimbeLink/Skywire modems, as it should match the host MCU IO voltage level. The VREF pin of the module will draw less than 1mA when the modem is powered.

The NimbeLink/Skywire modems on top of the Skywire Click adapter use the standard UART interface with commonly used UART RX and TX pins to communicate with the host MCU. In addition to the RX and TX pins, the UART flow control RTS and CTS pins are also available. Some additional pins are available on Click board™, such as the reset RST pin and enable EN pin. There is also an ADC input pin to the modem on ADI of the mikroBUS™ socket, which supports 8-bit or 10-bit resolution depending on the modem. In addition, the CAT M1 NimbeLink, instead of the ADC, has a ring feature on this pin. Before further development, please consult the modem’s exact datasheet. If you do not need this feature, you can unsolder the 0 Ohm resistor and use this pin as a standard interrupt or GPIO pin for additional Click board™.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VIO SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly.

Specifications

Pinout diagram

This table shows how the pinout on Skywire click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Enable	EN	1	AN	PWM	16	CTS	UART CTS
Reset	RST	2	RST	INT	15	AD1	ADC Input
UART RTS	RTS	3	CS	TX	14	TX	UART TX
	NC	4	SCK	RX	13	RX	UART RX
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power supply	3.3V	7	3.3V	5V	10	5V	Power supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Skywire Click electrical specifications