RN2903 datasheet(8/24 Pages) MICROCHIP

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RN2903

DS50002390B-page 8

 2015 Microchip Technology Inc.

3.0

TYPICAL HARDWARE CONNECTIONS

Figure 3-1 shows the typical hardware connections.

FIGURE 3-1:

HARDWARE CONNECTIONS

3.1

INTERFACE TO HOST MCU

The RN2903 module has a dedicated UART interface

to communicate with a host controller. Optional

handshake lines are supported in future firmware

releases. The “RN2903 LoRa® Technology Module

Command Reference User’s Guide” (DS40001811)

provides a detailed UART command description.

Table 3-1 shows the default settings for the UART

communication.

3.2

GPIO PINS (GPIO0–GPIO13)

The module has 14 GPIO pins. These lines can be

connected to switches, LEDs, and relay outputs. The

pins can be either logic inputs or outputs, and some

pins have analog input capability that can be accessed

via the module firmware. These pins have limited sink

and source capabilities. Electrical characteristics are

described in Table 2-2. For more information, see

“RN2903 LoRa® Technology Module Command

Reference User’s Guide” (DS40001811).

3.3

RF CONNECTION

When routing RF path, use proper strip lines with an

impedance of 50 Ohm.

3.4

RESET PIN

The Reset pin of the module is an active-low logic

input.

3.5

POWER PINS

It is recommended to connect power pins (Pin 12 and

34) to a stable supply voltage with sufficient source

current. Table 2-3 shows the current consumption.

Additional filtering capacitors are not required but used

to ensure stable supply voltage in a noisy environment.

RN2903

GPIOs

Host MCU

CTS

(1)

RTS

(1)

CTS

RFH

915 MHz band

UART

Status LEDs,

witches,

ogic IOs,

etc.

Note 1: Optional handshake lines

supported in future firmware releases.

TABLE 3-1:

DEFAULT UART SETTINGS

Specification

Description

Baud Rate

57600 bps

Packet Length

8 bit

Parity Bit

Stop Bits

1 bit

Hardware Flow Control

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