Fiber Opt Click 3.3V

How does it work?

Fiber Opt Click 3.3V is based on one IF-D91, a fiber-optic photodiode, and one IF-E97, a fiber-optic LED, both from Industrial Fiber Optics. The IF-D91 is a high-speed photodiode detector housed in a connector-less plastic fiber optic package. Its optical response extends from 400 to 1100nm, making it compatible with a wide range of visible and near-infrared LED and laser diode sources. The detector package features an internal micro-lens and a precision-molded PBT housing to ensure efficient optical coupling with standard 1000μm core 2.2mm jacketed plastic fiber cable. When used with high-speed sources, the IF-D91 is capable of data rates up to 100Mbps. It can also be used for analog video links with bandwidths up to 70MHz.

The IF-E97 is a high-optical-output visible red LED, also housed in a precision-molded PBT package with an internal micro-lens for optimal optical coupling with the same type of plastic fiber cable. Its output spectrum, produced by a GaAlAs die, peaks at 650nm — an optimal transmission window for PMMA plastic optical fiber. The red light has low attenuation in PMMA fibers and helps with installation diagnostics. Combined with its high optical power and linearity, the IF-E97 supports data rates of up to 1Mbps under appropriate driving conditions.

This Click board™ communicates with the host MCU over selectable pins of the mikroBUS™ socket, the UART, or some general-purpose pins. Communication can be selected through the GPIO UART selection jumper, as UART is selected by default. Otherwise, communication can be achieved directly through GPIO pins, where PWM and INT pins of the mikroBUS™ socket have that role. Also, using AN pin, it is possible to check the analog voltage of the fiber-optic photodiode.

This Click board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before using MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.

Specifications

Pinout diagram

This table shows how the pinout on Fiber Opt Click 3.3V corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Analog Signal	AN	1	AN	PWM	16	PWM	GPIO RX
	NC	2	RST	INT	15	INT	GPIO TX
	NC	3	CS	RX	14	RX	UART TX
	NC	4	SCK	TX	13	TX	UART RX
	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

Fiber Opt Click 3.3V electrical specifications