I2C Controlled 4 x 4 USB matrix using 8 x MAX4899AEETE+T 4 x MAX7310 and 1 x ADG2188

Question

Hi 
 I have made schematics for I2C Controlled 4 x 4 USB matrix using 8 x MAX4899AEETE+T 4 x MAX7310 and 1 x ADG2188. 
 Could you please help me with setting the default address for ADG2188. 
 Also see if I have missed any supporting components needed for the Ic&rsquo;s to work? 
 Am I reading the datasheets correctly that the reset pins for ADG2188 and MAX7310 should be pulled high through 10k resister then shorted to ground to rest them? 
 Below are the 2-part schematics. 
 Thanks 
 MSC2000

Christian · Accepted Answer

Hi, MSC2000 .

To set the default address for the ADG2188, the device uses a 7-bit address where the four most significant bits are fixed at 1110, and the three least significant bits are determined by the logic levels on pins A2, A1, and A0. In your schematic, it appears that all three address pins are tied to ground, which sets them to logic 0 and results in a valid default address. Regarding the RESET pins for both the ADG2188 and MAX7310, you're reading the datasheets correctly: although the ADG2188 datasheet does not explicitly mention pull-up resistors, it requires the RESET pin to be held high during normal operation. Therefore, it is standard practice to pull RESET high through a 10kΩ resistor to VDD and momentarily short it to ground to perform a reset. Could you please confirm if the address lines (A0, A1, A2) and the RESET pin are hardwired to ground in your design? If so, the ADG2188 will remain in a reset state, and its switching functionality cannot be controlled until RESET is pulled high.

Best regards,
Christian

Popular Forums

Product Forums

Application Forums

Design Center Forums

Highlighted Webinar

Places

Libraries

Upcoming Learning & Events

Challenge Yourself!

What's Brewing

Places

Resources

Visit ContentZone

The Latest Read

New Release

Recent Technical Insights

Forums

Learn

Community Hub

ContentZone

Products Mentioned

Associated Drivers

Thread Details

I2C Controlled 4 x 4 USB matrix using 8 x MAX4899AEETE+T 4 x MAX7310 and 1 x ADG2188

Thread Summary

Before You Switch