Analog MUX 3 Click is a compact add-on board that switches one of the eight inputs to one output. This board features the ADG738, a CMOS analog matrix switch with a serially-controlled SPI interface from Analog Devices. In an active state, the ADG738 conducts equally well in both directions, making it suitable for multiplexing and demultiplexing applications. It can also be configured as a type of switch array where any, all, or none of eight switches may be closed any time. All channels exhibit ‘break-before-make switching action, preventing momentary shorting when switching channels. This Click board™ is suitable for a wide range of applications, from industrial and instrumentation to medical, consumer, communications, and automotive systems.
Analog MUX 3 Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
Analog MUX 3 Click uses the ADG738, a CMOS 8-channel analog matrix switch with a serially-controlled SPI interface from Analog Devices. The ADG738 can operate equally well as either multiplexer, demultiplexer, or switch array, providing more flexibility. It also features a low on-resistance closely matched between switches and very flat over the entire signal range. During the Power-Up of the ADG738, all switching channels will be in the OFF condition, and the internal shift register will contain all zeros and remains so until a valid write takes place. All channels exhibit ‘break-before-make switching action preventing momentary shorting when switching channels.
Each bit of the 8-bit serial word corresponds to one switch of the device. Internal switching channels are independently controlled by an individual bit, providing an option of having any, all, or none of the switches activated. All of the input channels of the multiplexer can be easily connected to a nine pole spring action block terminal, without having to use any additional tools, such as screwdrivers, while the output pin from the multiplexer is routed to the AN pin on the mikroBUS™ socket.
When changing the switch conditions, a new 8-bit word is written to the input shift register. Some of the bits may be the same as the previous write cycle, as the user may not wish to change the state of some switches. To minimize glitches on these switches' output, the ADG738 cleverly compares the state of switches from the previous write cycle. If the switch is already in the ON state and needs to stay in that condition, there will be minimal glitches on the switch's output.
Analog MUX 3 Click communicates with MCU using the SPI serial interface compatible with standard SPI, QSPI™, MICROWIRE™, DSP interface standards, and operates at clock rates up to 30MHz. Also, this Click board™ has a Reset pin routed to the RST pin on the mikroBUS™ socket, which clears the input register and turns all switches to the OFF condition.
This Click board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to properly use the SPI communication lines. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
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