RN41 datasheet(11/28 Pages) MICROCHIP

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 2014 Microchip Technology Inc.

DS50002280A-page 11

RN41/RN41N

Microchip offers HCI mode in two hardware interfaces:

• HCI over UART (RN41HCI-I/RM)

• HCI over USB (RN41U-I/RM)

2.6.1

HCI OVER UART

In this mode, the hardware interface between the host

processor and the Bluetooth module is the UART con-

figured at 115.2 Kbps. You must interface the flow con-

trol signals between the host processor and the

Bluetooth module for the HCI interface to work. Failure

to do so can cause the host processor and the Blue-

tooth module to become out of sync and break the

Bluetooth link.

2.6.2

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.

2.7

Soldering Recommendations

The RN41/RN41N wireless module was assembled

using standard lead-free reflow profile IPC/JEDEC J-

STD-020.

The module can be soldered to the host PCB using

standard leaded and lead-free solder reflow profiles.

To avoid damaging the module, the following recom-

mendations are given:

• Microchip Technology Application Note,” AN233

Solder Reflow Recommendation” (DS00233) pro-

vides solder reflow recommendations

• Do not exceed peak temperature (Tp) of 250 C°

• Refer to the solder paste data sheet for specific

reflow profile recommendations

• Use no-clean flux solder paste

• Do not wash as moisture can be trapped under

the shield

• Use only one flow. If the PCB requires multiple

flows, apply the module on the final flow.

2.8

SPI Interface

The SPI Interface is primarily used for factory test and

diagnostics. Although not required, the SPI interface is

useful for restoring a corrupted flash image or enabling

test modes required for certification testing.

When module is installed in a final product that requires

European type approval, see Section 3.3 “Europe”, it

is recommended that the SPI interface should be

accessible via 6-pin header as shown in Figure 2-6.

FIGURE 2-6:

OPTIONAL SPI

INTERFACE

2.9

Bluetooth SIG QDID

The RN41 has a QDID registered with the Bluetooth

SIG. The manufacturer using the RN41 module in their

end product can reference this QDID when filing an

EPL (end product listing) to use Bluetooth® brand and

logo. Please visit the Bluetooth SIG at

www.bluetooth.org for more information.

Declaration ID: B013180

QDID: 7786

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