Opto 2 click
PID: MIKROE-3015
Weight: 27 g
Opto 2 click is an optical isolator used
to provide an optical galvanic isolation
of sensitive lines. The used
optoisolation elements require very
low input current to be driven, down
to 1.3mA (min). The speed of the
internal optocoupler elements of the
Opto click 2 allows it to work with the
signals up to 20MHz. The Opto click 2
to provide a galvanic isolation of the
MCU pins, allowing driving by external
components, while protecting it from
surges up to 5kV on the driver side.
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Table of contents
1. How does it work?
2. Specifications
3. Pinout diagram
4. Onboard settings and indicators
5. Opto 2 click electrical
characteristics
6. Software support
7. mikroSDK
8. Downloads
Opto 2 click is an optical isolator used to provide an optical galvanic
isolation of sensitive lines. The used optoisolation elements require very low
input current to be driven, down to 1.3mA (min). The speed of the internal
optocoupler elements of the Opto click 2 allows it to work with the signals up
to 20MHz. The Opto click 2 to provide a galvanic isolation of the MCU pins,
allowing driving by external components, while protecting it from surges up
to 5kV on the driver side.
Opto click 2 can be used in applications where the input side is under risk of
high voltage surges in a noisy environment. Since it provides a galvanic
isolation, the electrical potential of the input side circuit does not have to be
the same as the electrical potential of the MCU circuit. Featuring the galvanic
isolation, Opto click 2 blocks so-called stray currents, that may appear as a
result of differences in ground potential, or the electromagnetic induction.
Opto 2 click provides means to drive inputs of the connected MCU with a
wide range of external applications and signals.
How does it work?
Opto 2 click uses four TLP2770, 20-Mbps low-power optocouplers, from
Toshiba. These are fast optocouplers, with their output stages shielded
against EMI, allowing them to work on higher speeds, providing common-
mode transient immunity of ±20 kV/μs. The internal LED elements are driven
with 4mA for 5V operation or 2.6mA for 3.3V operation. The input stages are
also equipped with (Schottky) diodes, which prevents inverse polarization of
the LED elements and thus, a permanent damage that might occur in that
case.
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The working principle of the optocouplers is quite simple: A photo-emitting
element - usually a LED, is encapsulated inside the die along with the photo-
sensitive element, which can be a photo-sensitive transistor or a photo-
diode. LEDs and photo-sensing elements are galvanically isolated, making
the input and output electrical networks completely independent of each
other. When the LED is biased, it emits light which in return causes the
current to flow through the photo-sensitive element. In these particular
optocouplers, the output stage is additionally conditioned by a Schmitt
trigger and it drives the output transistors which form a totem pole output
stage. Having a totem pole output configuration allows the output stage to
both sink and source current.
The optocoupler inputs - the anodes (labeled as A) and cathodes (labeled as
C) of the internal optocoupler LEDs, are routed to the screw terminals,
which allow connection the external electrical circuit, used to trigger an
event on the isolated MCU. The electrical potential between the anode and
the cathode input of each optocoupler element should stay within the range
between 3.3V and 5V.
The optocoupler outputs are routed to the mikroBUS™. Pins INT, CS, RST,
and AN of the mikroBUS™ are routed to the optocoupler outputs 1, 2, 3, and
4, respectively, and are labeled as IN1, IN2, IN3, and IN4. As already
mentioned, the output stages are conditioned with the Schmitt trigger
circuit, reducing the input noise sensitivity and false triggering. The Faraday
shield protects the output stages against EMI and provides common-mode
transient immunity of ±20 kV/μs. Although these mikroBUS™ pins are
labeled as IN1 to IN4, they are actually outputs from the optocouplers, and it
is highly recommended to use them as the INPUT pins on the host MCU.
The Click board™ is equipped with an SMD jumper labeled as LOGIC, which
allows selection of the voltage, applied to the optocoupler output stage. This
voltage effectively determines the logic voltage level for the MCU pins. It can
be selected between 3.3V and 5V, allowing this Click board™ to be interfaced
with both 3.3V and 5V MCUs.
The provided library offers functions that simplify and speed up the
application development. The included example application demonstrates
their use. This application can be used as a reference for custom projects.
Specifications
Type Optocoupler
Used for isolation MCU input pins from the
Applications influence of the external circuitry, for using in two
independent electric circuits.
On-board modules TLP2770, a 20-Mbps low-power optocoupler, from
Toshiba.
Key Features
High isolation voltage of the galvanic barrier - up
to 5kV, Faraday shield on the output stage,
providing common-mode transient immunity of
±20 kV/μs, screw terminals for easy connection,
low current consumption, high input sensitivity.
Interface GPIO
Input Voltage 3.3V or 5V
Click board size M (42.9 x 25.4 mm)
Pinout diagram
This table shows how the pinout on Opto 2 click corresponds to the pinout
on the mikroBUS™ socket (the latter shown in the two middle columns).
Notes Pin Pin Notes
Optocoupler 4
OUT IN4 1AN PWM 16 NC
Optocoupler 3
OUT IN3 2RST INT 15 IN1 Optocoupler
1 OUT
Optocoupler 2
OUT IN2 3CS RX 14 NC
NC 4SCK TX 13 NC
NC 5MISO SCL 12 NC
NC 6MOSI SDA 11 NC
Power supply +3.3V 73.3V 5V 10 +5V Power
supply
Ground GND 8GND GND 9GND Ground
Onboard settings and indicators
Label Name Default Description
LD1 PWR -Power LED indicator
JP1 LOGIC Left Logic voltage level selection: left position 3.3V,
right position 5V
Opto 2 click electrical characteristics
Description Min Typ Max Unit
Input forward current (I ) - - 8 mA
Peak transient input forward current (I ) - - 1 A
Output current (I ) - - 10 mA
Software support
We provide a library for Opto 2 click on our Libstock page, as well as a demo
application (example), developed using MikroElektronika compilers. The
demo application can run on all the main MikroElektronika development
boards.
Library Description
The library performs the check procedure for the desired outputs (IN1 - IN4).
For more details check the documentation.
Key functions:
uint8_t opto2_checkOut1( void ) - The function checks the state of the
OUT1 pin.
Examples Description
The demo application is composed of three sections:
System Initialization - Initializes peripherals and pins.
Application Initialization - Initializes GPIO driver and selects the outputs (OUT1 -
OUT4) which state be checked.
Application Task - (code snippet) - Performs the check procedure for selected
outputs and logs the states from the outputs on USB UART. Repeats the check
procedure every 2 seconds.
void applicationTask()
{
tmp = 1;
for (cnt = 0; cnt < 4; cnt++)
{
switch (selOutput & tmp)
{
case 0x01 :
{
checkOutput = opto2_checkOut1();
if (checkOutput == 0)
{
mikrobus_logWrite( "OUT1 is low", _LOG_LINE );
}
else
{
mikrobus_logWrite( "OUT1 is high", _LOG_LINE );
}
break;
}
case 0x02 :
{
checkOutput = opto2_checkOut2();
if (checkOutput == 0)
{
mikrobus_logWrite( "OUT2 is low", _LOG_LINE );
}
else
F
FPT
O
{
mikrobus_logWrite( "OUT2 is high", _LOG_LINE );
}
break;
}
case 0x04 :
{
checkOutput = opto2_checkOut3();
if (checkOutput == 0)
{
mikrobus_logWrite( "OUT3 is low", _LOG_LINE );
}
else
{
mikrobus_logWrite( "OUT3 is high", _LOG_LINE );
}
break;
}
case 0x08 :
{
checkOutput = opto2_checkOut4();
if (checkOutput == 0)
{
mikrobus_logWrite( "OUT4 is low", _LOG_LINE );
}
else
{
mikrobus_logWrite( "OUT4 is high", _LOG_LINE );
}
break;
}
default :
{
break;
}
}
tmp <<= 1;
}
mikrobus_logWrite( "", _LOG_LINE );
Delay_ms( 2000 );
}
void opto2_setLogger( uint8_t selOut1, uint8_t selOut2, uint8_t selOut3, uint8_t
selOut4 ) - Determines the outputs that be checked and logged on USB UART
terminal. If selOutx is 1, the corresponding output will be included in check
procedure.vAnd if selOutx is 0, that output will not be included in check
procedure and will not be logged on UART.
The full application code, and ready to use projects can be found on our
Libstock page.
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, USB UART 2 click or RS232 click 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
This click board is supported by 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.
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Downloads
mikroBUS™ Standard specification
LibStock: mikroSDK
TLP2770 datasheet
Opto 2 click schematic
Opto 2 click: 2D and 3D files
Libstock: Opto 2 click library
