RN1723 datasheet(9/32 Pages) MICROCHIP

9 / 32 page

 2015 Microchip Technology Inc.

DS70005224A-page 9

RN1723

2.0

CIRCUIT DESCRIPTION

(HARDWARE INTERFACE)

2.1

UART Interface

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

and 4-wire (RX, TX, CTS, and RTS) configurations

with hardware flow control. The logic levels are

CMOS voltage levels (not RS-232 voltage levels).

The UART interface supports the following baud

rates in bits per second:

• 2,400

• 4,800

• 9,600

• 19,200

• 38,400

•115,200

• 230,400

Refer to the “WiFly Command Reference, Advanced

Features

and

Applications

User's

Guide”

(DS50002230) for UART configuration information.

2.2

SPI Master Interface

The RN1723 module contains a master Serial

Peripheral

Interface

(SPI),

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 RN1723 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 implemented in

the WiFly application.

2.4

In-System Programming (ISP)

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

programming of the module. The RN1723 module

firmware can be upgraded by ISP using a *.bin file.

Optionally, it is recommended to place the ISP header

on the host PCB to facilitate firmware upgrades during

development and manufacturing. The header is two

rows by 8 pins with a 0.050 inch space and pitch (Sam-

tech P/N FTSH-108-01-F-DV-K). Refer to Figure 3-3

for information about connecting to the module for ISP.

The RN-ISP in-system programming interface con-

nects to the module for ISP. In addition, refer to the RN-

ISP product page on the Microchip web site for more

information.

2.5

The Sensor Interface

External sensor devices can connect to the RN1723

module via its sensor interface. There are a total of 8

sensor interface inputs available. They are labeled

SENSOR_IF[0] – SENSOR_IF[7], on the RN1723 Pin

diagram, as shown in Figure 1-2.

The sensor interface is suitable for, but not limited to,

connecting the following type of devices:

• Analog-to-Digital Conversion sensors

• Switch sensor

• Vibration sensors, motion sensors, and ball-and-tube

sensors

In addition to providing data input to the RN1723

module, some of the sensors can be used to wake-up

the module from sleep. A typical use case would have

one sensor input wake up the module, while another

sensor input provides it with external data that can be

transmitted wirelessly.

2.6

Analog Sensor Inputs

Eight sensor interface input pins, SENSOR_IF0

through SENSORIF7, can be used as analog sensor

inputs. The sensor pins are 1.2V tolerant and can

accept input voltages up to 1.2V, but saturate at

400 mV.

The RN1723 14-bit Analog-to-Digital Converter (ADC)

requires a 35 ms conversion time, with 0.01% linearity.

The pertinent analog sensor input specifications are

provided in Table 2-1.

TABLE 2-1:

ANALOG SENSOR INPUTS

For additional instructions on how to read and manage

the data from the analog sensor inputs, please refer to

the show

<value>

command in the “WiFly

Command

Reference,

Advanced

Features

and

Applications User’s Guide” (DS50002230).

Note:

The

use

flow

control

highly

recommended to ensure proper data

integrity.

Note:

The over-the-air FTP update files (*.img

or *.mif) are not compatible with the ISP.

WARNING

DO NOT apply voltages greater than 1.2V on any

of the sensor pins. Failure to heed this warning

could

result

permanent

damage

the

module.

Parameter

Value

AD SENSOR_IF[0 – 7]

measurement range

0-400 mV (not to exceed

1.2 VDC)

Resolution

14 bits = 12 µV

Accuracy

5% uncalibrated; 0.01%

calibrated

Minimum conversion time 35 µs (5 kHz over Wi-Fi®)

RN1723 Arkusz danych(PDF) 9 Page - Microchip Technology

RN1723 Arkusz danych(HTML) 9 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Arkusz danych Pobierz

Link URL