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Analog Devices MAXREFDES278 IO-Link® 8-Channel Solenoid Actuator is a reference design based on the MAX22514 IO-Link Transceiver. The MAXREFDES278 demonstrates an 8-Channel Solenoid Actuator using the MAX22200 1A Octal Integrated Serial-Controlled Solenoid Driver with Integrated FETs. This reference design has two power options. It can be powered through the IO-Link master directly, delivering up to 800mA total load, or for higher currents, external power can be provided using an external source. To ensure no current flows back to the IO-Link master and the IO-Link portion is always powered, this design uses the MAX17608 Current Limiter, which features overvoltage (OV), under-voltage (UV), and reverse protection.
Featuring an industrial 85mm x 42mm form factor, the Analog Devices MAXREFDES278 IO-Link® 8-Channel Solenoid Actuator uses industry-standard M12 connectors. These connectors allow a 4-wire IO-Link cable to be used. Each solenoid channel has a 2-way terminal block.
The MAXREFDES278 Reference Design includes an STMicroelectronics STM32L4 32-Bit Low-Power Microcontroller to interface between the MAX22200 Octal Solenoid Driver and the MAX22514 IO-Link Transceiver. The MAX22514 features integrated surge protection for robust communication in a small printed circuit board (PCB) area without requiring external protection components such as transient voltage suppressor (TVS) diodes. The MAX22514 is available in a tiny 25-bump wafer-level package (WLP) as well as a 24-pin TQFN package, allowing the MAXREFDES278# to have a small footprint.
The MAXREFDES278 is reverse-polarity protected using the integrated active reverse-polarity protection of the MAX22514. The MAX22514 has an integrated DC-DC converter and two integrated low dropout (LDO) regulators. The DC-DC converter generates the 3.3V supply for the microcontroller and the MAX22200 logic supply, reducing power-dissipation and the number of external components required, saving space and cost. The MAX22514 also features a low on-resistance C/Q driver to minimize power dissipation, allowing this reference design to consume minimal power with very low thermal dissipation.
The MAXREFDES278 Reference Design utilizes the Technologie Management Gruppe Technologie und Engineering (TMG TE) IO-Link Device Stack to communicate to any IO-Link version 1.1-compliant master. The Reference Design can connect to a compliant IO-Link master via the onboard M12 connector. Connecting the MAXREFDES278 to a USB IO-Link master, such as the MAXREFDES165 or MAXREFDES145, allows easy evaluation.
