User's Manual

www.rovingnetworks.com Version 3.43 5/21/13 page 9
RN41-DS
Roving Networks offers HCI mode in two hardware
interfaces:
• HCI over UART (RN-41HCI-I/RM)
• HCI over USB (RN-41U-I/RM)
2.7.1 HCI OVER UART
In this mode, the hardware interface between the host
processor and the Bluetooth module is the UART. You
must interface the flow control signals between the host
processor and the Bluetooth module for the HCI inter-
face to work. Failure to do so can cause the host pro-
cessor and the Bluetooth module to become out of
sync and break the Bluetooth link.
2.7.2 HCI OVER USB
In this mode, the hardware interface between the host
processor and the Bluetooth module is the USB. In this
architecture, the Bluetooth module is the USB slave
and the host processor is the USB host.
Using the USB interface offers the advantage of a
faster data link between the Bluetooth module and the
host processor. With this architecture, it is possible to
achieve Bluetooth’s theoretical maximum throughput of
3 Mpbs.
2.8 Solder Reflow Profile
The lead-free solder reflow temperature and times are:
• Temperature—230° C, 30 - 40 seconds, peak
250° C maximum
• Preheat temperature—165° ± 15° C, 90 to 120
seconds
• Time—Single pass, one time