RN171 datasheet(9/30 Pages) MICROCHIP

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 2014-2016 Microchip Technology Inc.

DS70005171B-page 9

RN171

2.0

CIRCUIT DESCRIPTION

(HARDWARE INTERFACE)

The following sections describe the module’s hardware

interface.

2.1

UART Interface

The UART interface supports 2-wire (RX, TX) and

4-wire configurations with hardware flow control (RX,

TX, CTS, and RTS). The logic levels are CMOS voltage

levels (not RS-232 voltage levels). The UART interface

supports baud rates of 2,400; 4,800; 9,600; 19,200;

38,400; 115,200; and 230,400 bits per second. Refer to

the “WiFly Command Reference, Advanced Features

and Applications User's Guide

” (DS50002230) for

UART configuration information.

2.2

SPI Master Interface

The RN171 module contains a master SPI interface

(SPI_CS, SPI_CLK, SPI_MISO, and SPI_MOSI) that is

connected to an internal Flash memory. Do not connect

these pins on the host PCB.

2.3

SDIO Client Interface

The RN171 modules contain an SDIO client with

SD-SPI

mode

and

interface

(SD_CLK/SCLK,

SD_D3/SS, SD-D2, SD_D1/INT, SD_D0/MISO, and

SD_CMD/MOSI). This interface is not currently imple-

mented in the WiFly command reference.

2.4

In-System Programming (ISP)

The ISP_TX, ISP_RX, and other pins allow in-system

programming of the module. The module’s firmware

can be upgraded via ISP using a *.bin file.

Though it is optional, it is recommended to place the

ISP header on the host PCB to facilitate firmware

upgrades during development and manufacturing. The

header is two row by 8-pin with 0.050 inch space and

pitch (Samtech P/N FTSH-108-01-F-DV-K). Refer to

Figure 3-3 for information about connecting to the mod-

ule for ISP. The RN-ISP in-system programming inter-

face connects to the module for ISP. Refer to the

RN-ISP product page on the Microchip web site for

more information.

2.5

Analog Sensor Interface

Sensors (0-3) can be used to wake the module. The

sensor pins are 1.2V tolerant. When sensor pins are

used as sensor inputs, they accept input voltages up to

1.2V but saturate at 400 mV.

The 14-bit ADC requires a 35 ms conversion time with

0.01% linearity.

Additionally, the module has a low-power interface for

interfacing sensors such as push buttons, accelerome-

ters, security seals, and motion sensors.

2.6

Sensor Interface

The sensor can interface to:

• Four switch sensors

• A motion sensor for use with external ball-in-tube

• A pulsed comparator

• A Sample Measurement Unit (SMU) ADC

• A current generator for measurement

The switch sensors, motion sensors, and pulsed com-

parator are available when the module is awake or

asleep. The SMU ADC is only available when the mod-

ule is awake. The sensor elements share the module’s

eight sensor pins.

When the module is asleep, the sensor interface can

be used to detect events such as a switch opening or

closing, motion, or an analog voltage moving outside of

a preset window. When the module is awake, the SMU

can digitize the analog signals and make high-precision

analog measurements.

2.7

General Purpose Input/Output

(GPIO) Pins

The RN171 has 14 GPIO (GPIO1 through GPIO14)

pins that can be commanded by ASCII commands.

GPIO10 through GPIO14 pins have secondary func-

tions for the UART (TX, RX, CTS, and RTS), while oth-

ers can control connection modes, LEDs, etc.

Refer to the “WiFly Command Reference, Advanced

Features

and

Applications

User's

Guide

”

(DS50002230) for information on configuring and con-

trolling the module.

Note:

Use hardware flow control for baud rates

of 115,200 and higher.

Note:

The over-the-air FTP update image file

(*.img) is not compatible with the ISP.

WARNING

DO NOT apply voltages greater than 1.2V on any

of the sensor pins.

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