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W6R21403-14023-E-16 Datasheet(PDF) 9 Page - Microchip Technology |
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W6R21403-14023-E-16 Datasheet(HTML) 9 Page - Microchip Technology |
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 q <value> command in the “WiFly Command Reference, Advanced Features and Applications User’s Guide” (DS50002230). Note: The use of flow control is 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 in permanent damage to 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®) |
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