MUX 2 click
PID: MIKROE‐3245
Weight: 25 g
MUX 2 click is a Click board™ that switches one of the eight inputs to one output. It
employs the MUX508, a modern CMOS analog multiplexing integrated circuit, produced
by Texas Instruments. This IC can be powered with both dual power supplies, ranging
from ±5V to ±18V, and single power supplies, ranging from 10V to 36V. It offers rail-torail operation, allowing the input signal to swing up (and down) to the voltage of the
power supply, with no distortion. Features such as the break-before-make switching
action, electrostatic discharge protection up to 2kV, low on-resistance and low input
current leakage, make this circuit a perfect solution for various switching applications,
operating with both unipolar and bipolar signals.
It comes in the package which also includes the mikroSDK™ software and a library with
all the functions. The Click board™ comes as a fully tested and approved prototype,
making it a reliable device ready to use on the development board.
How does it work?
MUX 2 click is equipped with the MUX508, a precise analog multiplexing IC, produced
by Texas Instruments. The MUX508 can be used with a wide range of power supplies. It
can handle both dual and single power supplies, as well as the symmetrical and nonsymmetrical ones. This allows it to be used in a very wide range of different applications.
Four control pins are used to switch one of eight inputs to a single output. Control pins
labeled as A0, A1, and A2 are routed to the mikroBUS™ and can be operated by both
3.3V and 5V MCUs. The fourth control pin is labeled as EN pin, and it is used to enable
the internal multiplexing switches of the IC, when is set to a HIGH logic level (it is active
HIGH). A0, A1, and A2 pins are routed to RST, PWM, and INT pins of the mikroBUS™
respectively, while the EN pin is routed to the CS pin on the mikroBUS™.
The MUX508 IC is targeted towards working with both bipolar and unipolar singleended inputs. Each input is labeled as S1 to S8. When a specific channel is selected by
using the A0 to A2 pins, it will be switched to the output pin, labeled as D. For the
improved stability, each pin is equipped with the 100nF parallel capacitor and 100Ω
series resistance. The input and the output signal pins are routed to the standard
2.54mm pitch 2x5 pins header on the Click board™.
The ultra-low leakage current ensures that there is no signal interference from the
inputs that are not selected by the A0, A1, and A2 pins. A low crosstalk also ensures that
the signal on one channel remains clean of interferences caused by other channels. To
prevent any two inputs to be switched at the output at the same time, a break-beforemake switching action is utilized. This ensures a reliable operation of the IC and the Click
board™ itself.
MUX 2 click does not use the power from the mikroBUS™ power rails, except for the LED
indicator. Instead, a three-pole screw terminal is used to connect an external power
supply. Having in mind the minimum input voltage of 10V or ±5V, a power supply
should be connected to this terminal before operating the Click board™. The input and
output signals can be connected via the 2x5 pins header. As mentioned before, the
MUX508 IC supports rail-to-rail operation. Independent power supply input allows the
user to work with a wide range of signal amplitudes, depending on the application
requirements, as long as the power supply stays within the limits.
More information about the MUX508 can be found in the attached datasheet. However,
the Click board™ comes equipped with a library that contains easy to use functions and
a usage example that may be used as a reference for the development.
Specifications
Type
Voltage translator
Automatization and process control, programmable logic controllers, digital
Applications
multimeters, battery monitoring, and other applications that require
differential signal switching.
On-board
modules
MUX508, a precise analog multiplexing IC, produced by Texas Instruments
Features such as the break-before-make switching action, electrostatic
Key Features
discharge protection up to 2kV, low on-resistance and low input current
leakage, make this circuit a perfect solution for various switching
applications, especially those that utilize differential signals
Interface
GPIO
Input Voltage
5V
Click board
size
M (42.9 x 25.4 mm)
Pinout diagram
This table shows how the pinout on MUX 2 Click 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
A1
Control pin 1
Control pin 0
A0
2
RST
INT
15
A2
Control pin 2
Chip Enable
EN
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
GND
8
GND
GND
9
GND
Ground
Ground
Onboard settings and indicators
Label
Name
Default
Description
LD1
PWR
-
Power LED indicator
J1
-
-
2x5 pins I/O header
CN1
-
-
Power supply input terminal
MUX 2 click electrical specifications
Description
VIN (voltage at the power supply input terminal, single
supply)
VIN (voltage at the power supply input terminal,
symmetrical supply)
Min
Typ
Max
Unit
10
-
36
V
±5
-
±18
V
Software support
We provide a library for the MUX 2 click 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 includes function for set current active mux channel and function for enable
or disble mux device.
Key functions:
void mux2_activeMuxChannel(uint8_t ch) - Functions for set active MUX channel
void mux2_deviceEnable() - Functions for enable MUX device
Examples description
The application is composed of the three sections :
System Initialization - Sets RST pin, CS pin, PWM pin and INT pin as OUTPUT
Application Initialization - Initialization driver init end enable device
Application Task - (code snippet) - Sets the current active channel. Changes the channel every
5 sec.
void applicationTask()
{
mux2_activeMuxChannel(_MUX2_CHANNEL_S1);
Delay_ms( 5000 );
mux2_activeMuxChannel(_MUX2_CHANNEL_S2);
Delay_ms( 5000 );
mux2_activeMuxChannel(_MUX2_CHANNEL_S3);
Delay_ms( 5000 );
mux2_activeMuxChannel(_MUX2_CHANNEL_S4);
Delay_ms( 5000 );
mux2_activeMuxChannel(_MUX2_CHANNEL_S5);
Delay_ms( 5000 );
mux2_activeMuxChannel(_MUX2_CHANNEL_S6);
Delay_ms( 5000 );
mux2_activeMuxChannel(_MUX2_CHANNEL_S7);
Delay_ms( 5000 );
mux2_activeMuxChannel(_MUX2_CHANNEL_S8);
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:
GPIO
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 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.
For more information about mikroSDK, visit the official page.
https://www.mikroe.com/mux‐2‐click 11‐27‐18
