MC75i Hardware Interface Description
3.12 USB Interface
71
MC75i_HD_v01.100a
Page 55 of 122
2009-08-13
Confidential / Released
3.12
USB Interface
MC75i supports a USB 2.0 Full Speed (12Mbit/s) device interface. The USB interface is prima-
rily intended for use as command and data interface and for downloading firmware. The USB
I/O-lines are capable of driving the signal at min 3.0V. They are 5V I/O compliant.
The USB host is responsible for supplying, across the VUSB_IN line, power to the module’s
USB interface, but not to other MC75i interfaces. This is because MC75i is designed as a self-
powered device compliant with the “Universal Serial Bus Specification Revision 2.0”
1
.
Figure 18:
USB circuit
To properly connect the module’s USB interface to the host a USB 2.0 compatible connector
is required. For more information on how to install a USB modem driver and on how to integrate
USB into MC75i applications see
. This Application Note also lists a selection of USB 2.0
hubs the module has been tested to operate with.