RN2903_18 datasheet(9/26 Pages) MICROCHIP

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 2015-2018 Microchip Technology Inc.

DS50002390E-page 9

RN2903

3.4

RESET Pin

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

input. An internal weak pull-up resistor is enabled when

the pin is configured as the MCLR input.

3.5

Power Pins

It is recommended to connect power pins (Pin 12 and

Pin 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.

3.6

Internal Program Pins

PGC_INT (Pin 30) and PGD_INT (Pin 31) are internal

program pins used during manufacturing. For normal

operation, these pins can be left unconnected.

The normal firmware upgrade method is through the

internal bootloader of the module via the UART. The

method is documented in the “RN2903 LoRa®

Technology Module Command Reference User’s

Guide” (DS40001811).

However, for backup firmware update purposes the

user can place a 6-pin ICSP header on their host PCB

with PGC_INT (Pin 30), PGD_INT (Pin 31), RESET

(Pin 32), power and ground.

During High Voltage In-Circuit Serial Programming

mode, the RESET pin is driven with high-voltage (9V),

therefore protection may be necessary for sensitive

devices.

Note:

Only

official

Microchip

Technology

firmware released for the RN2903 module

shall be used to maintain FCC and IC

certification.

RN2903 Datasheet(PDF) 9 Page - Microchip Technology